zagami
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Hi All,
Fusion crust has taken on a renewed importance in the authentication of specimens. But beyond its utilitarian use, it is really a sheen of solidified lava that reflects both the turmoil of the meteorite’s arrival on earth, but also expresses the individual chemical makeup of the space rock when melted.
From foamy jet-black, to tar-like shiny plastic, to milky brown paint, fusion crust is a characteristic of meteorites whose value only appreciates, and beauty only grows as one delves deeper into meteorite collecting. Here are a dozen examples of crust from my collection. Each is a testament to the extraordinary and individual nature of these beasts.
Enjoy.
Bialystok, Poland
Howardite
Fell: October 5, 1827
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zagami
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Pavel, Bulgaria H5 Chondrite Fell: February 28, 1966
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zagami
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Pasamonte, New Mexico, USA Eucrite Fell: March 24, 1933
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zagami
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Selakopi, Indonesia H5 Chondrite Fell: September 26, 1939
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zagami
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Binda, Australia Howardite Fell: May 25, 1912
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zagami
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Alfianello, Italy
L6 Chondrite
Fell: February 16, 1883
This monster slice is well over a kilogram. Note the little centimeter cube peeking out in the lower left.
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zagami
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Ibbenbüren, Germany Diogenite Fell: June 17, 1870
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zagami
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Murchison, Australia CM2 Carbonaceous Chondrite Fell: September 28, 1969
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zagami
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Goalpara, India Ureilite Discovered in 1868 among the mineral and gem specimens provided to the Calcutta Museum by the Rajah of Goalpara.
It is presumed that the Goalpara meteorite was witnessed to fall which is how it wound up in a gem collection. It is not assumed that the Rajah of Goalpara knew that this class of meteorite called Ureilite actually contains diamonds, which it does.
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zagami
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Zabrodje, Belarus L6 Chondrite Fell: September 22, 1893 This meteorite fell as a single stone right through the roof of a house.
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zagami
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Haraiya, India Eucrite, Monomict Fell: August 1878
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zagami
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Cumberland Falls, Kentucky, USA Aubrite Fell: April 9, 1919
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csa/montana
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Loc: montana
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These specimens are absolutely beautiful! 
Thanks for sharing such beautiful photos of them!
-------------------- Carol
AstroTech 16" Dob (Thanks ASTRONOMICS!)
AstroTech 66ED / Vixen 80MF/AstroTech Voyager
Masuyama's 7.5, 15, 25W, 35mm,
Tak LE 5mm B/TMB 3.2
7mm Pentax XL, 10mm Pentax XW
14mm Meade 4000 UWA
22mm Pan, 35mm Pan
DreamCatcher Dobservatory, #2
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Talstarone
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Awesome Images,Martin. Those are some of the best looking specimens I have ever seen.
It is interesting comparing the differences in the fusion crust from each individual type of Meteorite. Though I would be more the happy to give any of the pictured specimens a place to call home.
But the sheer pressure,heat,and speed that each meteorite is subjected to during its descent is incredible.Its amazing with them experiencing these processes, that any would or could survive.
-------------------- Todd C.
Celestron NexStar 4SE(102mm F/13)Maksutov-Cass
Meade ETX-80AT(80mm F/5)Achro Refractor
Meade ETX-60BB(60mm F/5.8)Achro Refractor
www.innerplanetaryproducts.com
Meteorites and More....
"Outer Space at Down to Earth Prices"
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edwincjones
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wow!
--------------------
n w arkansas
Binocular, Solar, General Amateur Astronomy
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Ed Fortier
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wow, indeed.
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Dick Lipke
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Loc: Marine City,Mich.
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Not to seem to repetitive,but WOW!
-------------------- LX90 8",Cornado Max 40,Miyauchi 20x100 Bino's,and way to many eyepieces and filters,
Thousand Oaks 8" Ha filter
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Talstarone
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While going through a few pieces to place for sale at my store, I ran across this little piece with some of its Fusion Crust still in place. This is a Specimen of NWA 869:
-------------------- Todd C.
Celestron NexStar 4SE(102mm F/13)Maksutov-Cass
Meade ETX-80AT(80mm F/5)Achro Refractor
Meade ETX-60BB(60mm F/5.8)Achro Refractor
www.innerplanetaryproducts.com
Meteorites and More....
"Outer Space at Down to Earth Prices"
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Talstarone
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Post deleted by Talstarone
-------------------- Todd C.
Celestron NexStar 4SE(102mm F/13)Maksutov-Cass
Meade ETX-80AT(80mm F/5)Achro Refractor
Meade ETX-60BB(60mm F/5.8)Achro Refractor
www.innerplanetaryproducts.com
Meteorites and More....
"Outer Space at Down to Earth Prices"
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Talstarone
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Post deleted by Talstarone
-------------------- Todd C.
Celestron NexStar 4SE(102mm F/13)Maksutov-Cass
Meade ETX-80AT(80mm F/5)Achro Refractor
Meade ETX-60BB(60mm F/5.8)Achro Refractor
www.innerplanetaryproducts.com
Meteorites and More....
"Outer Space at Down to Earth Prices"
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Talstarone
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Last...This Really Was a Pleasant Surprize. I have specimens with fusion crusts I am aware of. Its always a joy to look at a small piece that had not been examined in quite a while, and then find this:
-------------------- Todd C.
Celestron NexStar 4SE(102mm F/13)Maksutov-Cass
Meade ETX-80AT(80mm F/5)Achro Refractor
Meade ETX-60BB(60mm F/5.8)Achro Refractor
www.innerplanetaryproducts.com
Meteorites and More....
"Outer Space at Down to Earth Prices"
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zagami
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Hi,
Thanks for sharing the pic.
Are you sure it is 869? Unless my memory is going, or the pic was photoshopped, black crust is not an 869 trait. I remember 869 having a weathered brownish varnish with no real aspect one would describe as fresh.
Does the internal nature of your pictured piece match other 869 in your inventory? Maybe a polish is in order on the internal side of this specimen.
That crust looks somewhat calcium-rich eucrite-ish if you ask me. What does it do around a magnet?
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Talstarone
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Quote:
Hi,
Thanks for sharing the pic.
Are you sure it is 869? Unless my memory is going, or the pic was photoshopped, black crust is not an 869 trait. I remember 869 having a weathered brownish varnish with no real aspect one would describe as fresh.
Does the internal nature of your pictured piece match other 869 in your inventory? Maybe a polish is in order on the internal side of this specimen.
That crust looks somewhat calcium-rich eucrite-ish if you ask me. What does it do around a magnet?
Martin, I am not 100% sure how to take your last post.I am very baffled about the Photoshop reference.
-------------------- Todd C.
Celestron NexStar 4SE(102mm F/13)Maksutov-Cass
Meade ETX-80AT(80mm F/5)Achro Refractor
Meade ETX-60BB(60mm F/5.8)Achro Refractor
www.innerplanetaryproducts.com
Meteorites and More....
"Outer Space at Down to Earth Prices"
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zagami
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All I mean is that sometimes when photos are prepared for display on the internet, the contrast is cleaned up, maybe the image is brightened. Things like that can cause the crust to appear a richer, fresher black than if compared in person.
Of course the opposite can happen as well. If you look at my pic of Pavel above, I can assure you the crust is not green, and actually appears black rather than with dusty dark yellowish overtones.
I noticed when comparing your two posted images, the background is bluish in one, and fairly white in the other. The red cube is red in one, and pinkish in the other. Also, the black portion of the upper image is likely a pretty good black to trust, and it matches well with the specimen's crust. There is not much of a black strip in the lower pic so it is hard to compare blacks. Those "known" colors help me guess at the true color of the crust.
In the pic above where two specimens are side by side, it still looks like the fragment has blacker, more textured (possibly fresher?) crust.
Have you compared similar sized pieces (like the two above) with a magnet?
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Talstarone
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I am still somewhat confused as to where this is leading. When re-sizing the pics I do press a button that says Auto-Contrast. It brightens the image very,very slightly.
I touch NO OTHER brightness,contrast,temperature or any other controls that will change appearance. From what I read you seemed to think that the image is either not a specimen of NWA 869 or that I have changed the color.
I will send you a PM to see if I can understand what you are trying to say,because now I just dont get it.Sorry
-------------------- Todd C.
Celestron NexStar 4SE(102mm F/13)Maksutov-Cass
Meade ETX-80AT(80mm F/5)Achro Refractor
Meade ETX-60BB(60mm F/5.8)Achro Refractor
www.innerplanetaryproducts.com
Meteorites and More....
"Outer Space at Down to Earth Prices"
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zagami
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Ahhh, I see.
First of all, not all 869 is actually 869. When buying NWA material in bulk, there is often material that differs from the rest. Sometimes there are even plain old rocks in the box.
Now this mixing of material usually occurs at the main dealer level where material is purchased in the 10s to hundreds of kilos. The bulk material is usually high-graded or cherry picked for unusually crusty specimens, or ones that don't stick to a magnet. (early on in the NWA or Saharan meteorite trade, nomads were taught to use a magnet to identify meteorites from rocks. However, the rare achondrites including lunars and martians did not show any attractiveness to a magnet. So now the high grading of NWA material is often meteorite-looking material that is not attracted to a magnet--but I digress).
So in essence, just because something is listed as 869 does not mean with certainty that it is 869. In fact, the name NWA 869 has been kind of a general catch-all number for NWA material that looks much the same with the original 869 character.
I noticed the crust on your two pieces was different so my natural reaction is to consider the artifacts (brightness, contrast, etc.) of a digital image. If all hold up and the crust really is different, the the next logical step to to look for other differences.
I noticed that you photographed the specimen on a Hupe' Collection specimen label. I've known Greg and Adam for many years, and in fact, I was the very first person on the planet to give them ebay feedback. But I digress yet again. They get in big boxes of unclassified NWA material, irons, stones, etc. I know because I've been to their house when they lived in Renton, WA. I even did some high-grading myself. They study the pieces pulling out the odd ones for further inspection, selling the common ones (like 869), and donating other pieces. Sometimes they hit the jackpot with ultra-rare classes and planetary specimens. Sometimes they strike gold like with their olivine-diogenite. Sometimes ordinary chondrites hold amazing interiors full of chondrules, brecciation, metal, etc. But in the end, often those that look alike are often sold under the most likely classified NWA number.
Anyway, regardless of the given name of the material, there is a chance that it is something else. Maybe. Maybe not. But either way, it is worth exploring.
Digital imaging almost always presents a different view of the reality of a specimen so it is something to consider when viewing an image. Below is an example of this. Pictured is the slice of Weston that was in Bob Haag's 1994 collection catalog. As you can see, the actual specimen is different from the picture. And if I set the actual-actual specimen on the picture of the specimen sitting on the picture of the specimen (if you follow me), you will see that all three look somewhat different.
I hope this made sense, and thanks for your patience with me and my ramblings.
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zagami
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Hi again,
Here are a couple web links that offer insights into the NWA and 869 issues:
http://www.meteoritemarket.com/NWA869.htm
http://tin.er.usgs.gov/meteor/metbull.php?code=31890
http://www.meteorites.com.au/nwa869/
As you will read, there is much confusion about 869, and for many of the NWA in general for that matter.
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zagami
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Hello again,
Here is an excellent story by my friend Jim Tobin about his experiences with a similar situation.
http://www.meteorite-times.com/Back_Links/2004/March/Jims_Fragments.htm
I've known Jim for over a decade and have dug through giant boxes of NWA meteorites fresh from North West Africa and straight off the shipping truck at the Tucson show. Jim and I spent hours studying the stones, comparing magnetic properties, crust, heft, shape and form. We would buy them by the kilo in hopes that a saw cut would reveal magic, not more L6. I got a few winners, mostly low number chondrites, and possibly an achondrite I've yet to have analyzed.
Meteorites from NW Africa, etc. must be taken with a grain of salt, or better yet, with an understanding of the situation, how they were gathered, sorted, represented, sold, and then resold... and resold again.
Here is a article about this from Norbert Classen, the current president of the International Meteorite Collectors Association.
http://www.meteorite.fr/en/news/feature.htm
Anyway, I don't mean to rock any boats. However, those of us who were along for the entire ride of hot desert, Sahara, NWA and the like likely have a far different take on the nature of these stones than a collector who started collecting after the meteorite paradigm shifted as the hot desert stones flooded the market.
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Talstarone
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Martin, I have to say I look at your posts in a different light. Perhaps you meant them to be taken in one particular manner,but I have taken it in another light.
It seems as if you have tried to cast a dubious shadow on the hobby of meteorite collecting.This is cast on Both the Dealers as well as their products.
I for one can openly say that your post stating many pieces sold as NWA 869 are not actually NWA 869. But lets start with first things first.
Many,if not most meteorites come from one "main mass" or "parent body".The pieces cut from these "main mass" pieces are the same as the piece that was cut for classification and identification. So meteorite pieces that are sold from a find that consisted of one or two 200 + gram pieces, are completely 100% Genuine and Authentic(Unless sold by an individual who is purposely engaged in dis-honest business practices).
I can be sure that ALL of my Specimens are Genuine and as stated. More then 90% of my collection has come from The Hupe collection(which is one of the largest and most well respected and known for the "average" collector)(average meaning those of us who do not have thousands of dollars to spend on single specimens)Another 5% of my Collection has come from members in Good Standing of the IMCA. And the final amount of my collection has come from our resident Meteorite Dealer Mike Gilmer(Glassthrower) a member in good standing of the MS.
Very few of my specimens are from falls that contained several pieces(such as NWA 869).So I can be Assured that my collection contains actual meteorites from the Specimens they are claimed to be from.
So we can all be assured that pieces sold from a single meteorite are authentic. But in regards to specimens from Meteorites that have several "parent bodies" or NO Single "Main Mass" Specimen, I have this to show: No Where On This Specimen Card, Nor Any Where In The Listing Placed For This Individual Piece Of NWA 869, Is It Stated That There Is A Chance That It May Not Be A Piece Of 869,Or Possibly A Terrestrial Rock. 869
So I Seriously DO NOT Believe the Hupe's would sell a piece that they were not 100% sure of. I also do not believe the IMCA Would Allow Such Practices From ANY Of Its Members without revoking their membership or at the very least repramanding them for their business practices.
I am sending a copy of your posts to both the Hupes and the IMCA.I think it is only fair to allow both sides to have a chance to make their cases.
It is sad that what you have posted has scared and alarmed many average Collectors and those who have thought of collecting.
So in the end,Martin. You have taken a somewhat new hobby, that was growing at a tremendous rate, and cast a shadow upon it, that may stunt its growth and scare away new collectors.
I am not saying that you are being dishonest or trying to do anything damaging on purpose. I am merely pointing out how I have taken your post and what facts I do not agree with.
You have every right to express your beliefs and opinions. However these opinions can not be classified as facts without going through a long and arduious process that will also include information and posts of opinions from all sides involved.
So we will see where this series of opinions takes us.
-------------------- Todd C.
Celestron NexStar 4SE(102mm F/13)Maksutov-Cass
Meade ETX-80AT(80mm F/5)Achro Refractor
Meade ETX-60BB(6 |