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Identity HelpYosemite Mineral

21st Sep 2018 23:26 UTCAntonio Nazario

00138810015651953749679.jpg
As we all know collecting in US National Parks is prohibited. During the summer of 2017 I went on a hike in Yosemite National park and came across this feldspar plate. I only took a picture of it and left it there. Does anybody have a clue to what feldspar this is and any minerals associated?

21st Sep 2018 23:57 UTCScott Rider

Judging by the one crystal that is near the top/center of the plate, it looks a lot like the microcline I find in the Pikes Peak batholith pegmatites in Colorado. The color, luster, shape and all look like microcline. Just a guess though...

22nd Sep 2018 03:15 UTCWayne Corwin

To me it looks like a combo of microcline and albite.

22nd Sep 2018 06:11 UTCNicholas J. Rose

Don't forget the quartz and probable biotite.
 
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