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SEYMCHAN THE 5TH SPHERE OF MY COLLECTION COMPLETED FEBRUARY 22ND, 2007 Originally I was looking for Dronino material and purchased a large whole specimen from Serge of the Cometshop Team. However, it was not thick enough to produce a 50mm sphere. After a a few emails to Serge I discovered that he had a 7kg slab of Seymchan siderite that was large enough to produce a 50mm sphere but he had no way of processing it into an affordable rough I could use. I offered to process it for him and he accepted. I cut the slab into slices until I reached the thick center section which was large enough to yield a 52mm x 52mm x 60mm rough. I could have saved a little material by cutting a core but the time involved with that process and the cost of replacing the teeth on my core bit would have exceeded the value of the material I would have saved. My local machinist was too busy for this job so I sent the rough to a new machinist and he used a modified technique of my sphere machining process to produce this sphere. The modified technique was less expensive and quicker then the original process and he can machine variety of roughs (cores / cubes even whole specimens) so it will be the primary process I'll use to make my iron spheres. Etching Seymchan is very easy & I was very pleased with my first attempt so I didn't bother to try other techniques. The pattern is very similar to Gibeon but the scale is larger. I'm very glad I got to work with Serge on this project and hopefully we will be able to work together again.
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Name: Seymchan - This is an OFFICIAL meteorite name. Observed fall: No Year found: 1967 Country: Russia Mass: 323.3 Kg Classification: IIE / Iron, Ungrouped Circumstances of the fall or discovery: The larger specimen has been found by the geologist F. A. Mednikov during a geological survey. The meteorite hardly seen was lying among the stones of the brook-ebd. The smaller specimen was found at a distance of 20 m from the first one by I. H. Markov with a mine detector in october 1967. The main mass was turned to the Academy of Sciences of the USSR. Source: Meteoritical Bulletin, no. 43, Moscow (1968) reprinted Met. 5, 85-109 (1970) |
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This is a polished prototype Steel rough produced by my machinist on a 5 axis mill
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