Pallasites are very scarce and believed to have formed on differentiated bodies in the transition area between the metal-rich core and the olivine-rich mantle where the olivine could cool slowly enough to form relatively large crystals. The Brenham pallasite is a representative and relatively available example of this class.
1.2 x 60 x 100 mm. (26.3 grams) info
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Stony-iron meteorites consist of almost equal amounts of iron-nickel metal and silicate minerals and are amongst the most beautiful of meteorites. There are two different types of stony-iron, the pallasites and the mesosiderites .
Pallasites contain big, beautiful olive-green crystals, a form of magnesium-iron silicate called olivine , embedded entirely in metal. Pallasites can show big variations. Sometimes the olivine does not occur as a single crystal but as a cluster and elsewhere it can create a pattern of veins through solid metal.
There are differing opinions as to how pallasites formed. Some scientists believe that they formed from melted asteroids, like iron meteorites. When an asteroid melts, the dense iron metal sinks toward the centre to form an iron core. Pallasites are thought to be samples of the boundary between this metal core and the silicate, olivine-rich mantle around it. If this is the case, pallasites could potentially tell us a lot about the formation of the Earth and other terrestrial planets because they all have a similar structure. However, other scientists think that there are very few olivine-rich meteorites in the asteroid belt, and too many pallasites for them all to have come from a core-mantle boundary.
Wednesday, July 2, 2008
*Update STONY-IRON METEORITE - Pallasite (325 grams)
Description: STONY-IRON METEORITE - Pallasite(ME-599 BRAHIN, MINSK, BELORUSSIYA SSR, RUSSIA)
The Brahin pallasite was first discovered in 1810 near Minsk, Belorussia, Russia. Brahin pallasites are beautiful though not the most stable of the pallasites. They are however the most affordable. For the most stable, gem-like pallasites please visit our
Brahin Country : Belorussia
State/District : Gomel region
Coordinates : 52°30 'N, 30°20 'E Date of find : 1810
Type : Stony/iron PALPallasite, main group, fragmental olivine shape
Size : The Brahine measures 95 mm x 44 mm x 38 at its widest points. Thinnest point is 10 mm
Buy It Now : $4,900 USD.
Best Offer : thaicosmic@yahoo.com
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