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Post by agatewhisperer on Aug 22, 2020 15:07:20 GMT -5
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kyoti
has rocks in the head
Member since June 2020
Posts: 542
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Post by kyoti on Aug 22, 2020 17:04:45 GMT -5
It almost looks like some kind of an exotic granite. Are the little pink rectangles feldspar? I couldn't tell from the picture whether they flash like felspar does.
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Post by agatewhisperer on Aug 22, 2020 17:12:29 GMT -5
It almost looks like some kind of an exotic granite. Are the little pink rectangles feldspar? I couldn't tell from the picture whether they flash like felspar does. Yes the pink parts have a bit of a flash/sheen to them.
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EricD
Cave Dweller
High in the Mountains
Member since November 2019
Posts: 1,142
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Post by EricD on Aug 22, 2020 22:38:18 GMT -5
I was thinking the same thing, pink (kspar, pink or white) and black (feldspar) with a little copper or gold thrown in there for color. Copper or gold would vary with oxidation
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hummingbirdstones2
fully equipped rock polisher
Vince A., 1958-2023
Member since August 2018
Posts: 1,461
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Post by hummingbirdstones2 on Aug 22, 2020 23:01:45 GMT -5
Yeah, we have one piece like that here. Got it in a bulk lot from someone who could no longer pursue the hobby.
We were told by a "mineral guy" in our club it's a feldspar. I'm pushing the last three brain cells pretty hard, but it might be from far Northwestern AZ.
If I ever remember the locality, I'll post it, but it looks identical to the one in your photo.
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Post by rockjunquie on Aug 23, 2020 11:17:04 GMT -5
I think it is very attractive. I bet it makes nice cabs.
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Post by pauls on Aug 23, 2020 16:45:27 GMT -5
My guess is a Feldspar,I'm pretty sure of that. Black is maybe Tourmaline, I don't think it's Biotite Mica, also possibly a few flecks of Pyrite in there.
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Post by rmf on Aug 24, 2020 17:18:18 GMT -5
You are correct not a conglomerate but an Igneous rock. Phenocrysts are of feldspar.
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Post by agatewhisperer on Aug 24, 2020 22:14:52 GMT -5
Great, thanks for all the replies! Will see if it takes a polish!
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