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Meteorite over Russia

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#51 rfinney

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Posted 19 February 2013 - 09:24 PM

The NYT has a history of printing misinformation and bias against the private meteorite community.


Mike:

Good comments - I am also surprised that the NYT once again printed "trade in material from meteorites is largely illegal" - which is absolutely false.

I wrote a letter when the first NYT article was published which has since been widely circulated between scientists, collectors, and dealers - and for those who are interested - you can read it here:

http://www.meteorite...viewpoints.html

I have also referenced the relevant laws on my website:

http://www.meteorite...exportlaws.html

Best Regards,

- RF

#52 Mister T

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Posted 26 February 2013 - 10:25 AM

Has there been any estimation of the size and/or speed of the chunk that made the hole in the ice?

Is there a realistic chance of recovering any of it?

It will be interesting to see the strewn field map.

I LOVE this stuff!! :jump:

#53 Glassthrower

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Posted 28 February 2013 - 04:17 PM

Preliminary classification is ready - LL5 chondrite with a shock rating of 4.

It hasn't been officially approved by Met Soc yet, but this is the first step. I expect official approval will come quick on this one, given the global attention it captured.

Stay tuned. :)

#54 Dick Lipke

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Posted 10 March 2013 - 07:26 AM

www.sciencedaily.com/releases/2013/03/130307124554.htm

#55 ZielkeNightsky

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Posted 14 March 2013 - 06:39 PM

What a wonderful day.

A small complete stone from the fall was added to my collection today. Beautiful black crust, so fresh.... well I'm happy, so happy that I've I'm getting a small broken fragment.

#56 AFAdrenaline

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Posted 18 March 2013 - 01:16 AM

congrats! pics?

#57 peter scherff

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Posted 18 March 2013 - 08:06 AM

I have had an opportunity to see samples of the Chelyabinsk
meteorite. I think that these stones are almost as distinctive as the
fireball was spectacular.
Many samples have deep fractures.
Many samples have patches of reddish fusion crust. The reddish
crust may be secondary crust. It formed on broken surfaces or perhaps
in the lower portions of regmaglypts. The reddish crust is smoother
than the primary crust.
Some samples have a brownish "dusty" appearance. Despite
being freshly collected.
Here are some images of the sample in my collection:

Attached Files



#58 peter scherff

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Posted 18 March 2013 - 08:06 AM

another view:

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#59 peter scherff

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Posted 18 March 2013 - 08:07 AM

and a final view:

Thanks,

Peter

Attached Files



#60 csa/montana

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Posted 18 March 2013 - 10:46 AM

An amazing speciman; and I believe the first one, in our little group here!

#61 peter scherff

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Posted 18 March 2013 - 10:50 AM

Thanks Carol, I thought that it was going to be an average meteorite from an amazing fall. But it turned out to be an exciting meteorite from an amazing fall.

Peter

#62 Glassthrower

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Posted 18 March 2013 - 03:55 PM

Nice stone Peter. Thanks for sharing it. I am very anxious to receive mine. :)

Other news, the meteorite is official today :


Writeup from MB 101:

Chelyabinsk 54°49’N, 61°07’E (approximate centroid)

Chelyabinskaya oblast’, Russia

Fell: 15 Feb 2013; 3:22 UT

Classification: Ordinary chondrite (LL5)

History: At 9:22 a.m. (local time) on February 15, 2013, a bright fireball was seen by numerous residents in parts of the Kurgan, Tyumen, Ekaterinburg and Chelyabinsk districts. Images of the fireball were captured by many video cameras, especially in Chelyabinsk. Residents of the Chelyabinsk district heard the sound of a large explosion. The impact wave destroyed many windows in Chelyabinsk and surrounding cities. Many people were wounded by glass fragments. A part of the roof and a wall of a zinc plant and a stadium in Chelyabinsk were also damaged. Numerous (thousands) stones fell as a shower around Pervomaiskoe, Deputatsky and Yemanzhelinka villages ~40 km S of Chelyabinsk. The meteorite pieces were recovered and collected out of snow by local people immediately after the explosion. The snow cover was about 0.7 m deep. The falling stones formed holes surrounded by firn snow. Largest stones reached the frozen soil. A stone may have broken the ice of Chebarkul Lake, located 70 km W of Chelyabinsk. Small meteorite fragments were found around the 8 m hole in the ice but divers did not find any stones on the lake bottom.

Physical characteristics: The meteorite stones and fragments are from <1 g to 1.8 kg in weight and from a few mm to 10 cm (mainly 3-6 cm) in size. The total mass collected by local people is certainly >100 kg and perhaps > 500 kg. Fusion crusted stones are common. The fusion crust is black or brown and fresh. Broken fragments are rare. The interior of the stones is fresh but in some pieces there is evidence for weak oxidation of metal grains.

Petrography: (D.D. Badyukov and M.A. Nazarov, Vernad). The majority (2/3) of the stones are composed of a light-colored lithology with a typical chondritic texture. Chondrules (~63%) are readily delineated and set within a fragmental matrix. The mean chondrule diameter is 0.93 mm. The chondrule glass is devitrified. The main phases are olivine and orthopyroxene. Olivine shows mosaicism and planar fractures. Rare grains of augite and clinobronzite are present. Small and rare feldspar grains show undulutory extinction, planar deformation features, and are partly isotropic. Troilite (4 vol.%) and FeNi metal (1.3 vol.%) occur as irregularly shaped grains. Accessory minerals are chromite, ilmenite, and Cl-apatite. A significant portion (1/3) of the stones consist of a dark, fine-grained impact melt containing mineral and chondrule fragments. Feldspar is well developed and practically isotropic. No high-pressure phases were found in the impact melt. There are black-colored thin shock veins in both light and dark lithologies.

Geochemistry: (M.A. Nazarov, N.N. Kononkova, and I.V. Kubrakova, Vernad). Mineral chemistry: Olivine Fa 27.9±0.35, N=22; orthopyroxene Fs22.8±0.8Wo1.30±0.26, N=17; feldspar Ab86; chromite Fe/Fe+Mg=0.90, Cr/Cr+Al=0.85 (at.%). Major element composition of the light lithology (XRF, ICP-AS, wt%): Si=18.3, Ti=0.053, Al=1.12, Cr=0.40, Fe=19.8, Mn=0.26, Ca=1.43, Na=0.74, K=0.11, P=0.10, Ni=1.06, Co=0.046, S=1.7. Atomic ratios of Zn/Mn × 100=1.3, Al/Mn=8.8. The impact melt lithology has almost the same composition but it is distinctly higher in Ni, Zn, Cu, Mo, Cd, W, Re, Pb, Bi (ICP-MS).

Classification: Ordinary chondrite (LL5), shock stage S4, weathering W0.

Specimens: About 400 stones weighing 3.5 kg in total and a few thin sections are in Vernad.



#63 peter scherff

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Posted 18 March 2013 - 04:08 PM

Hi Mike,

Now I want to see the dark lithology. All that I have seen so far are shock veins. Any photos of the dark lithology out there?

Thanks,

Peter

#64 peter scherff

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Posted 18 March 2013 - 05:08 PM

I found a photo of the dark lithology!

Peter

#65 ZielkeNightsky

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Posted 18 March 2013 - 06:58 PM

Some pics.

Posted Image

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Note: I didn't manage to get the black look as you see when
holding it in HDR frames. Guess I have to retake them.

A broken fragment is on the way, and I'm still in the market for a larger piece.

#66 Grava T

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Posted 19 March 2013 - 07:23 AM

Nice! Hoping to get a piece someday. Thanks for the pics.

#67 JohnH

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Posted 20 March 2013 - 06:57 PM

Judging from the appearance of the various fragments, rounded objects with some intact and some fractured, I am of the opinion the meteorite was a collection of rounded pieces somehow held together until it entered the Earth's atmosphere.

Are these typical of this type fall?

#68 peter scherff

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Posted 20 March 2013 - 08:01 PM

Hi John,

I have never read of any way to create rounded rocks in space. My assumption is that the Chelyabinsk meteorite was a large rock that broke apart in our atmosphere. The various fragments were then shaped by further passage thru the atmosphere. There has never been a witnessed meteorite fall of a stone that was as energetic as the Chelyabinsk fall so we are in virgin territory now.

Thanks,

Peter

#69 Glassthrower

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Posted 21 March 2013 - 02:58 PM

From Russia with Love!

My first Chelyabinsk stone arrived today. :)

Attached Files



#70 ZielkeNightsky

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Posted 21 March 2013 - 03:56 PM

Congrats Michael. Nice specimen

#71 peter scherff

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Posted 21 March 2013 - 04:40 PM

Hi Michael,

I think that this fall will be known for the "peas" it produced. I think that you have a classic sample from this fall. Great acquisition.

Thanks,

Peter

#72 JimP

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Posted 21 March 2013 - 07:13 PM

Yes, and I believe it was Holbrook that produced pea sized meteorites in the USA although as I recall no big Boom was associated with Holbrook.
My first Chelyabinsk is on the way!!

Jim

#73 JimP

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Posted 21 March 2013 - 07:21 PM

Whoops there were loud booms associated with Holbrook!

http://www.delange.o...lbrook/HMF1.htm

#74 Grava T

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Posted 24 March 2013 - 07:37 AM

Nice piece Michael. Congrats!

#75 csa/montana

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Posted 25 March 2013 - 11:58 AM

I have a "large" micromount on it's way, will be here this week! I hope when the prices stabilize, I'll be able to pickup a larger piece!






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