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Washington rock... what is it?


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41 minutes ago, Joseph76 said:

Found in a creek, lower Cascades, near Darrington.  Serpentine?  Mariposite?

 

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My guesstimate is Serpentine. I ran across a a hundred yards of slabs and boulders of similar material in Mendocino Co. CA. back in the 'late 60s and took samples to a gem stone dealer and other allegedly knowledgeable experts and they all identified it as Serpentine. One of the "experts" who claimed that he was a geologist, said if Serpentine was exposed to extreme heat and pressure long enough, it might possibly become Jade but that Serpentine was too soft to polish to a mirror finish or make jewelry out of. It's definitely a nice looking rock though.

PS I lived in Granite Falls for a couple of years and traveled that Loop country deer hunting before the big avalanche happened. Beautiful country.

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Does not look like serpentine to me, but as BMC said, serpentine

is soft so check hardness. There are many green rocks 

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