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Meteorite-Times 2010 10.Pdf Meteorite-Times Magazine Contents by Editor Like Sign Up to see what your friends like. Featured Monthly Articles Accretion Desk by Martin Horejsi Jim’s Fragments by Jim Tobin Meteorite Market Trends by Michael Blood Bob’s Findings by Robert Verish IMCA Insights by The IMCA Team Micro Visions by John Kashuba Galactic Lore by Mike Gilmer Meteorite Calendar by Anne Black Meteorite of the Month by Michael Johnson Tektite of the Month by Editor Terms Of Use Materials contained in and linked to from this website do not necessarily reflect the views or opinions of The Meteorite Exchange, Inc., nor those of any person connected therewith. In no event shall The Meteorite Exchange, Inc. be responsible for, nor liable for, exposure to any such material in any form by any person or persons, whether written, graphic, audio or otherwise, presented on this or by any other website, web page or other cyber location linked to from this website. The Meteorite Exchange, Inc. does not endorse, edit nor hold any copyright interest in any material found on any website, web page or other cyber location linked to from this website. The Meteorite Exchange, Inc. shall not be held liable for any misinformation by any author, dealer and or seller. In no event will The Meteorite Exchange, Inc. be liable for any damages, including any loss of profits, lost savings, or any other commercial damage, including but not limited to special, consequential, or other damages arising out of this service. © Copyright 2002–2010 The Meteorite Exchange, Inc. All rights reserved. No reproduction of copyrighted material is allowed by any means without prior written permission of the copyright owner. Meteorite-Times Magazine Witnessed Fall: Borkut, Ukraine by Martin Horejsi Like Sign Up to see what your friends like. An October 1852 Witnessed Fall: Borkut, Ukraine The Borkut Meateorite: More Chondrite, Less Fat Early comparisons of the Borkut meteorite to others of the time led some scientists to conclude that Borkut had a higher chondrite to matrix ratio. This uncut face of Borkut shows the chondrule-rich landscape, yet not unlike a conglomerate sedimentary rock found here on earth. How about that big pebble! According to the few reports of the fall of the Borkut meteorite, at around 3:00 in the afternoon, a single stone fell from the sky burying itself about two feet into the ground and described as still warm when recovered. It weighed a total of 12 Vienna pounds, with the largest of the broken pieces toping the scales of the day at seven Vienna pounds and 6 1/4 loths. The Catalogue of Meteorites lists the TKW of Borkut as 7kg or 15 pounds 6.4 ounces for us Americans. The blade of a saw turns spheres into circles. Spend some time staring at this cut face. The longer you look, the more chondrules and features you will see. Notice the arc of broken white chondrule in the lower left. Or the large radial olivine-colored chondrule in the lower right. Or the white silicate armor surrounding the inclusion in the upper right. The Catalogue of Meteorites (2000) lists Borkut as an single 7kg stone L5 chondrite that fell on October 13, 1852. The place of fall is Zakarpatska Province, Ukraine. However the 1923 edition of the Catalogue by George Prior lists the location of the Borkut fall as Marmoros, Ruthenia, Czechoslovakia. And if that discrepancy is not enough, there was a brief note in Meteoritics & Planetary Science (Vol. 36, No. 9, Supplement , 2001) that lists Borkut as from Hungary citing the 1985 Catalogue of Meteorites as the reference. Landing on a world that was enlightened about meteorites barely half a century earlier, Borkut was an important sample for its day. Early studies of Borkut by Tschermak and others noted the richness of the chondrules secured in a somewhat limited matrix. For me, it is pieces such as this Borkut that show a the complexity of chondrule/matrix interaction furthering the confusion about the initial formation of the visible geology of the early solar system. The microphotographs above and below were taken by Gustav Tschermak von Seysenegg and published in 1885 in work titled Die mikroskopische Beschaf f enheit der Meteoriten, later republished in English in a tome titled The Microscopic Properties of Meteorites, Vol. 4, No. 6 (Smithsonian Contributions to Astrophysics, Washington, D.C., 1964). Tschermak’s words, translated by Translation by J.A. Wood and E.M. Wood are as follows: Part of a porphyritic chondrule in the chondrite Borkut; olivine crystals in a brown glass matrix. Much of this glass is enclosed by the olivine crystals. The upper crystal seems to have been sectioned parallel to {100} so that the sharp edge (021) Ð (0?21) is presented. The large glass inclusion in its center seems to fill a negative crystal. Other glass inclusions are also visible and, although incomplete, suggest a lamellar structure. Below is a larger crystal, bounded by distinct crystal faces. It is penetrated by several parallel tabular glass inclusions, which give it a chambered character. To the left is an olivine crystal with very few inclusions. A double chondrule in the chondrite Borkut. The smaller part is a monosomatic compartmented olivine chondrule with a pale transparent shell; translucent material fills the space between olivine plates. The large chondrule, which partly encloses the small one, is of the same character; both go to extinction simultaneously. Borkut is fragile and tends to disintegrate during sectioning, so that the double chondrule is partially separated from its original matrix. (Again, translation by J.A. Wood and E.M. Wood) With the Tom Phillips faux antique scale cube for comparison, it is easy to see the large size of that odd rock fragment just to the right of the broken face which is just to the right of the cube. The plethora of chondrules has led one observer to compare the spheres to grapes. Although Borkut did not fall in a vineyard like other meteorites, I cannot get that simile out of my mind when I look at the grapes, err, I mean chondrules in Borkut. Is this what crust looks like on Borkut? It’s hard to tell because the surface of Borkut is unlike most other meteorites. Normally the matrix holding the chondrules makes a nice melted surface with chondrules bubbling up through the velvety sheen. However Borkut, being mostly chondrules, reacted to the atmosphere’s attack differently. At least that is my scenario when assuming that the exterior of Borkut pictured above represents a sample of fusion crust. About six years ago, the wonderful sample of Brokut made its way from the Jim Schwade collection into mine. About 11 years before that, the specimen moved from the J. Schmutzler collection into Jim’s. Oddly, the collection history of my Borkut piece is good knowledge to have as a collector of historic stones. What’s odd you might ask? Simply the fact that of Borkut’s 158 years on this planet thus far, I can only account for about 10% of its time on earth. So Borkut, where have you been hiding? Until next time…. The Accretion Desk welcomes all comments and f eedback. [email protected] Please Share and Enjoy: Meteorite-Times Magazine Vacation 2010 by Jim Tobin Like Sign Up to see what your friends like. On Vacation Soon we’ll be off on vacation. We thought hard about where to go and what we wanted to do this year. And the end of all that thought was summed up in the word “veg” we are just going to go out and sit all day if we want and do nothing. With all the changing rules about where you can hunt and where you will get in trouble if you try to hunt, we decided to just plop ourselves down in a spot that would be ok for meteorite hunting if we wanted to do some and would be good for astronomy during the nights. So we will be sitting at Franconia. We have hunted here before with limited success. We have found both the irons and the stones and had a lot of fun but it can be frustrating now after all the hunting that has gone on here. We know they are still out there but it is a big area. We have set up telescopes at Franconia before and it is dark enough to see a large number of objects. The Moon is not going to be in a very favorable state for deep sky work this week but since lunar photography is what I want to do the first couple evenings should be great. The planet Jupiter will also be bright and high so we can watch the moons cross and do some fine work observing the planet. The new season of Meteorite Men will be starting this November and I am really looking forward to that. I am excited for Geoff and Steve this is a wonderful time for them. I am sure that years from now these will be some of the most treasured memories related to meteorites that they will have. Personally, I am looking forward to seeing where they go on this season. After a lot of procrastination I am getting my garage cleaned up. I have my work tables set up and my wife can get back to doing her stain glass work and I can sneak in and do mine too. I have my lapidary equipment on another long table. Spread out now it is nice to have room to work and to keep everything together.
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