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Post by captbob on Jan 19, 2015 10:13:06 GMT -5
And NO, you can't tumble it! From the Monte Cristo Range, Nevada   |
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jamesp
Cave Dweller 
Member since October 2012
Posts: 36,612
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Post by jamesp on Jan 19, 2015 20:40:38 GMT -5
Looks like heat was involved, and lots of it. Like preserved lava flow. reminds of a laid wall.
I will guess that something either shrunk or expanded.
we can saw the face and get lots of tumbles, c'mon captbob
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Post by snowmom on Jan 20, 2015 9:04:23 GMT -5
captbob, got a story to go with that one? awesome!
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Post by captbob on Jan 20, 2015 9:22:00 GMT -5
The story:
Textbook display specimen of breccia in rhyolite. Initially a light tan, this rhyolite was brecciated by faulting and then hydrothermally altered, with the mineralizing fluids rising through fractures in the breccia and permeating the rhyolite. The fracturing in this specimen is very clear and in contrast with the yellow to pinkish orange rhyolite fragments. The rhyolite is alternately banded by successive waves of hydrothermal fluids, so this specimen tells two stories.
This breccia is associated with gold mineralization and was exposed during development of a mine.
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Post by 150FromFundy on Jan 20, 2015 19:18:38 GMT -5
Looks like you will need to stabilize that with Opticon before cabbing it.
Darryl.
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