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peter scherff
sage


Reged: 07/11/06

Re: Meteorite over Russia new [Re: csa/montana]
      #5740559 - 03/18/13 11:50 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


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Glassthrower
Vendor - Galactic Stone & Ironworks
*****

Reged: 04/07/05

Loc: Oort Cloud 9
Re: Meteorite over Russia new [Re: peter scherff]
      #5741139 - 03/18/13 04:55 PM

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

Other news, the meteorite is official today :

Quote:



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.





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peter scherff
sage


Reged: 07/11/06

Re: Meteorite over Russia new [Re: Glassthrower]
      #5741172 - 03/18/13 05:08 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


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peter scherff
sage


Reged: 07/11/06

Re: Meteorite over Russia new [Re: peter scherff]
      #5741308 - 03/18/13 06:08 PM

I found a photo of the dark lithology!

Peter


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ZielkeNightsky
Carpal Tunnel
*****

Reged: 10/01/06

Loc: Denmark
Re: Meteorite over Russia new [Re: AFAdrenaline]
      #5741584 - 03/18/13 07:58 PM

Some pics.




Link to full size


Link to full size


Link to full size


Link to full size


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.

Edited by ZielkeNightsky (03/19/13 12:17 PM)


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Grava T
Pooh-Bah
*****

Reged: 06/18/08

Loc: Quebec, Canada
Re: Meteorite over Russia new [Re: ZielkeNightsky]
      #5742417 - 03/19/13 08:23 AM

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

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JohnH
Carpal Tunnel
****

Reged: 10/04/05

Loc: Squamish BC Moved!!!!!
Re: Meteorite over Russia new [Re: Grava T]
      #5746070 - 03/20/13 07:57 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?


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peter scherff
sage


Reged: 07/11/06

Re: Meteorite over Russia new [Re: JohnH]
      #5746282 - 03/20/13 09:01 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


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Glassthrower
Vendor - Galactic Stone & Ironworks
*****

Reged: 04/07/05

Loc: Oort Cloud 9
Re: Meteorite over Russia new [Re: Dick Lipke]
      #5747908 - 03/21/13 03:58 PM Attachment (20 downloads)

From Russia with Love!

My first Chelyabinsk stone arrived today.


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ZielkeNightsky
Carpal Tunnel
*****

Reged: 10/01/06

Loc: Denmark
Re: Meteorite over Russia new [Re: Glassthrower]
      #5748023 - 03/21/13 04:56 PM

Congrats Michael. Nice specimen

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peter scherff
sage


Reged: 07/11/06

Re: Meteorite over Russia new [Re: ZielkeNightsky]
      #5748133 - 03/21/13 05:40 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


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JimP
Pooh-Bah


Reged: 04/22/03

Loc: South Carolina
Re: Meteorite over Russia new [Re: peter scherff]
      #5748437 - 03/21/13 08:13 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


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JimP
Pooh-Bah


Reged: 04/22/03

Loc: South Carolina
Re: Meteorite over Russia new [Re: JimP]
      #5748451 - 03/21/13 08:21 PM

Whoops there were loud booms associated with Holbrook!

http://www.delange.org/Holbrook/HMF1.htm


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Grava T
Pooh-Bah
*****

Reged: 06/18/08

Loc: Quebec, Canada
Re: Meteorite over Russia new [Re: JimP]
      #5753391 - 03/24/13 08:37 AM

Nice piece Michael. Congrats!

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csa/montana
Den Mama
*****

Reged: 05/14/05

Loc: montana
Re: Meteorite over Russia [Re: Grava T]
      #5756159 - 03/25/13 12:58 PM

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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careysub
Carpal Tunnel
*****

Reged: 02/18/11

Loc: Rancho Cucamonga, CA
Re: Meteorite over Russia new [Re: csa/montana]
      #5761161 - 03/27/13 07:53 PM

For those of us who are not experienced meteorite collectors, can someone suggest where I should be looking to find Chebarkul specimens?

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peter scherff
sage


Reged: 07/11/06

Re: Meteorite over Russia new [Re: careysub]
      #5761200 - 03/27/13 08:13 PM

Hi Careysub,

I have purchased about a dozen samples from both US and Russian dealers. My only advice is to buy from an experienced dealer. If you are looking at an offering please feel free to ask us if we think it is a legitimate offer. If you are looking for an inexpensive sample Galactic Stone & Ironworks would be a safe source.

Thanks,

Peter


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JimP
Pooh-Bah


Reged: 04/22/03

Loc: South Carolina
Re: Meteorite over Russia new [Re: peter scherff]
      #5762180 - 03/28/13 11:01 AM

Some of the meteorites have a distinct reddish hue to the fusion crust in areas. Does anyone know what this is? Rust?

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peter scherff
sage


Reged: 07/11/06

Re: Meteorite over Russia new [Re: JimP]
      #5762333 - 03/28/13 12:37 PM

Hi JimP,

Here is a link to Dr. Svend Buhl's theory about the red crust.

Thnaks,

Peter


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rdandrea
Carpal Tunnel
*****

Reged: 06/13/10

Loc: Colorado, USA DM59ra
Re: Meteorite over Russia new [Re: Dick Lipke]
      #5762785 - 03/28/13 05:40 PM

PBS' NOVA this week is about the Chelyabinsk meteor.

You can watch on line:
http://www.pbs.org/wgbh/nova/earth/meteor-strike.html

Good show, a little sensationalist in places; shows some of the meteorites that were collected within weeks of the fall. Some of the SEM micrographs suggest why this meteor produced "peas."


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