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Stump the experts! What is it.
  
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Catahoula




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PostPosted: Mar 21, 2019 21:19    Post subject: Stump the experts! What is it.  

Hello All,

I recently posted a common opal cluster. This was found a few inches away in the same cut. Beautiful pale green, double terminated. I am used to seeing crystals with these angles but this seems to be a stone.

It is a flat, matte green with no luster. Apx 6" tall and 4" across. Short and stubby. The pit is in a lime dyke. There is a lot of sphalerite (zinc), iron mica and such around so the rusty covering is on three sides. Every angle is perfect, but not in an shape or order that is familiar or ordered. The top is a chisel point. The bottom is a flatter termination with irregular surface.
I will post more images. I appreciate your opinion and perhaps a clue how to properly clean. It has soaked for a day in soapy water with no help. Hesitant to soak in vinegar or muriatic acid until I know more.

Thank you
Jess



IMG_1290.jpg
 Mineral: Unknown
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Southern Sierra Nevada, California
15cm x 10cm
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Catahoula




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PostPosted: Mar 21, 2019 21:23    Post subject: Re: Stump the experts! What is it.  

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Catahoula




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PostPosted: Mar 21, 2019 21:24    Post subject: Re: Stump the experts! What is it.  

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Matt_Zukowski
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PostPosted: Mar 21, 2019 21:38    Post subject: Re: Stump the experts! What is it.  

The flat surfaces are probably just joints and the rock is a chert or limestone or something else. Do scratch and acid tests. Although unlikely from the photo, if you are in a pegmatite, perhaps this is a piece of feldspar and one or more of the flat surfaces are cleavage or growth planes.
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