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Author Topic: Tiny thundereggs in mystery matrix  (Read 50 times)

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R.U. Sirius

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Tiny thundereggs in mystery matrix
« on: May 09, 2023, 04:23:52 PM »
Today I cut in half this irregular rock that was full of embedded spheroids with silica-filled cores - really a bunch of grape-sized lithophysae! Some beautiful red staining and even water lines are evident if you look carefully.

What confuses me is the matrix. It's not your typical rhyolite. Feels gritty, and is relatively dark with subtle green colour to it - more on the olivine-rich ultramafic end.

Does anyone here recognize it in terms of locality?

First image shows the sawn face, second one is the rough, both wet.
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lithicbeads

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Re: Tiny thundereggs in mystery matrix
« Reply #1 on: May 10, 2023, 09:44:01 AM »
 These come from lots of places an are well studied. The green is celedonite .
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