Natural History Auction #6012

;Natural background public sale #6012 КНИГИ ; ХОББИ и РЕМЕСЛА Название:Natural heritage AuctionИздательство: history Год / месяц: January 18, 2009 Номер: 6012 Язык:Английский Страниц:171 Формат: pdf Размер:6.0Mb Для сайта: Мир книгОтличный каталог аукциона минералов , окаменелостей ,самоцветов и изделий из них и др.hotfile.com.com zero

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Individual sharp, rhombic crystals to ⅝ inch across were found scattered over an atypical grey matrix with druzy Pyrite. Unlike most of the pink Smithsonite found there, the color in this specimen is caused by the presence of Manganese, not the more normal (for Tsumeb); Cobalt. There is a ‘notch’ in one of the main crystals which shows signs of being part of a complex growth habit. The condition is excellent and this rare specimen measures 2¾ x 1¾ x 1⅞ inches. com to view other collectibles auctions.

The rounded exterior is the result of glacial ‘scouring’ during the last Ice Age, when enormous moving masses of ice bulldozed through copper seams in the country rock of the area. Upon melting, the glacier literally ‘dropped its load’, scattering debris far and wide. Rarely are they found in this size and particularly rare, with these features. The exterior has been polished in selected areas to provide a window into the shining interior of this exceptional specimen that measures an impressive 30¾ x 19½ x 6½ inches thick.

Provenance: Dr. Miguel Romero Sanchez Collection Estimate: $8000-$10000 41137 GREEN OCTAHEDRAL DIAMOND CRYSTAL Sierra Leone Of all the fancy diamond crystal colors, green is the second most rare (after red). A. 61 ct. Because diamonds are the only gemstones composed of a single element (carbon) and because their crystal lattice is so strong, only three atoms, nitrogen, hydrogen and boron, are small enough to work their way into the tetrahedral crystal arrangement. Nitrogen will cause a yellow or brown coloration, whilst the green hue can be caused by atomic or gamma radiation.

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