May 2012

Almahata Sitta

It seems understatement to say that Almahata Sitta is polymict given that it contains at least twelve lithologies.  Since the  lithologic types are dominated by ureilites, though, it is classified as a polymict ureilite.  Much of the remainder is EL and EH chondrites of various petrographic grades, melts and breccias.  Also found are H and L ordinary chondrites and a

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TEKTITE THESES, THEMES, TROPHIES, & TRIVIA: Dragon Tracks!

This spectacular Thailandite from the Khorat Plateau region of northeastern Thailand, exhibits exceptionally well-developed skin splits. These formed after the skin had cooled sufficiently to react in a brittle manner while the interior remained soft and gooey. When this water balloon-like blob splatted, the skin split open revealing the viscous interior. Note the contrast in skin ornamentation between the two

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