Matijevic Hill first survey, Sol 3057 - 3152 |
Matijevic Hill first survey, Sol 3057 - 3152 |
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![]() The Poet Dude ![]() ![]() ![]() ![]() Group: Moderator Posts: 5551 Joined: 15-March 04 From: Kendal, Cumbria, UK Member No.: 60 ![]() |
Oooooh, you're pretty...
Might be here a while, you think? Edit: better colours on this amended version, I think... http://twitpic.com/apn9s1/full -------------------- |
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![]() The Poet Dude ![]() ![]() ![]() ![]() Group: Moderator Posts: 5551 Joined: 15-March 04 From: Kendal, Cumbria, UK Member No.: 60 ![]() |
What the hell...??!?!! (And, Stu, brilliant work; thanks!!!) Thanks, Nick. You liked that..? You'll love this... -------------------- |
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Member ![]() ![]() ![]() Group: Members Posts: 384 Joined: 4-January 07 Member No.: 1555 ![]() |
These somewhat resemble devitrification spherulites (a type of spherule) that form during the localized crystallization of water-bearing glass, although the glass involved is usually more silica-rich (e.g., obsidian) than what was likely the case here. Such spherules can be hollow on the inside, owing to steam released during crystallization; large hollows are called lithophysae. (Many years ago I did much field and theoretical work on lithophysae containing gem topaz.) Spherulites can be more resistant to erosion than the rapidly altering remnant glass that surrounds them. Just another possibility to add to those already suggested. |
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