Lapidaryforum.net

Let's Rock => Identifications of Materials => Topic started by: Sifu on April 30, 2016, 09:32:27 AM

Title: Green mineral
Post by: Sifu on April 30, 2016, 09:32:27 AM

Found this on the North Fork of the Teanaway River. It had some polish sitting in the river. It isn't agate or jasper. I vibe tumbled it with these quartz stones, and after the large grit cycle it was reduced in size but polished nicely. Then I made the mistake of putting it in with the agates for a second vibe cycle, with smaller grit. Not only did it shrink further, but the surface lost its nice polish and is now pitted.  :sad:

Hardness is in the 5-6 range. It has a soapy feel in the hands that make it really pleasurable to touch. And I love the vibrant green hue. I'd like to find more of this and figure out how to work it!

Title: Re: Green mineral
Post by: rocks2dust on April 30, 2016, 09:38:50 AM

Sounds like serpentine.

Title: Re: Green mineral
Post by: Sifu on April 30, 2016, 09:56:57 AM

Thanks. That makes sense, especially given the feel and the amount of serpentinite in the surrounding country rock.

Title: Re: Green mineral
Post by: Gergis on April 30, 2016, 10:32:11 AM

Do ya have more pics? I would take some outdoors and at different angles

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Title: Re: Green mineral
Post by: lithicbeads on April 30, 2016, 05:24:58 PM

If the area that looks like a manganese dendrite is in fact a dendrite I would vote for a piece of nephrite.The hardness is correct for either.