Author Topic: Calling all flame/plume experts!  (Read 535 times)

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Calling all flame/plume experts!
« on: November 12, 2015, 04:20:05 PM »
I recently bought a grab bag of slabs that had mostly really nice classic dry head material (minis).

However, the slab below was in the bunch as well. The peculiar thing is the line of dark spikey formations in the top of the flames, which in turn have more agate on top of them. When dry, they reveal a platy crystal structure which reflects light like mica. Tried to capture in the dry photo. Seems odd that Mica (igneous?) would form in between two periods of chalcedony formation.

Any idea what the dark structures are and from where this material might originate?




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Re: Calling all flame/plume experts!
« Reply #1 on: November 14, 2015, 08:38:57 AM »
I had a medium small geode that when cut revealed spikey sagenites in the agate that reflect just like this. I was just calling it sagenitic agate, but no idea of any actual name. Mine did not have plumes. It was mostly just clearish agate- looks brazilian maybe, with the mica-like sagenites, a bit spikier than yours and sometimes in half moons, but similar. I'll be interested what you hear back.