jaime
off to a rocking start
Member since June 2020
Posts: 16
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Post by jaime on Jul 17, 2021 0:37:49 GMT -5
Any help identifying this rock would be greatly appreciated. It is from the ski mountain in Big Bear Lake and is very sparkly, seems to be on the softer side. Thanks. 😊
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Post by stephan on Jul 17, 2021 1:47:28 GMT -5
That’s pretty complex geology there. From granite and gabbro to metamorphosed sedimentary rocks. In short… it’s hard to tell from a picture. Can you try to get a better pic, and be a little more specific about the hardness? Softer than x, but harder than y might help. So might streak color, if you’re willing to try that. Also, is it brittle? Heavy or light for its size, compared to, say, quartz? Really wild guess… maybe marcasite or similar iron sulfide, if it’s brittle and leaves a gray streak.
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pizzano
Cave Dweller
Member since February 2018
Posts: 1,390
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Post by pizzano on Jul 17, 2021 11:26:53 GMT -5
I’m thinking this is biotite mica schist. From the photo, think you've nailed this one...........there's one particular slope along the Moonridge (Big Bear) portion of the ski and bike trail course that's packed with mica schist.......during certain times of the day, late morning, the entire slope glistens (sparkles) like silver, thus the name Silverback Ridge.......very common material in that region, was even mined for awhile back in the late 50's...........if one is lucky enough, might even find chunks that have blue metallic veins running through it, that's the stuff most sought out.....!
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