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Is it Mica or ??

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55fossil
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« on: July 21, 2015, 02:06:44 pm »

     Yeah, I know this should be easy but I do not know minerals and a lot of other things. This piece is very green, looks platy like Mica but also appears chatoyant. If it is Mica, is it a specific type?  Came from a yard sale in Idaho.  thanks

Added update  7-22-15     

       I tried scratching it with a knife point and it was too hard. I tried to get it to cleave at some of the layer points and it was very strongly attached. It did not flake like mica would. It will have to wait until I can get some saw time and cut a cabochon.  thanks to all, Neal


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light house jack
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« Reply #1 on: July 21, 2015, 02:37:33 pm »

Not mica.  I cannot recall what it is this afternoon.
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lopacki
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« Reply #2 on: July 21, 2015, 02:42:51 pm »

Looks like fluorite to me.

Danny
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Trails
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« Reply #3 on: July 21, 2015, 04:06:45 pm »

Might be some green moonstone there...

Recently sliced up a small chunk of some pearly white moonstone from 1957 Sears & Roebuck tumbled stone catalog that looks stunningly close to this, aside from green, but I have seen green like this in moonstone before. It does flake to some degree, I never managed to get a cab bigger then a nickle but every one of them came out beautiful still..

Fluorite would be my second guess, but this looks too square ridged.

Not Mica though..
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Tay
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« Reply #4 on: July 21, 2015, 04:33:41 pm »

Hey 55

It looks cool but have you done a hardness test yet? In my opinion that is the first step in learning what you have.

Bless
Shawn
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jakesrocks
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« Reply #5 on: July 21, 2015, 05:28:27 pm »

Could be any number of the boron minerals. Try scratching it with your fingernail.
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« Reply #6 on: July 21, 2015, 07:20:56 pm »

Cleavage is right for Feldspar.
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Bryan
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« Reply #7 on: July 21, 2015, 07:45:54 pm »

It looks like green oligoclase "moonstone" feldspar from India to me.  The chatoyancy is a strong clue as is the crystal form. 
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lithicbeads
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« Reply #8 on: July 21, 2015, 08:05:30 pm »

I keep thinking anhydrite but the moonstone sounds correct.
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55fossil
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« Reply #9 on: July 22, 2015, 05:41:14 am »

I tried scratching it with a knife point and it was too hard. I tried to get it to cleave at some of the layer points and it was very strongly attached. It did not flake like mica would. It will have to wait until I can get some saw time and cut a cabochon.  thanks to all, Neal
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Mark
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« Reply #10 on: July 23, 2015, 02:37:36 am »

Orthoclase, Feldspar, Moonstone, etc.  I like Orthoclase and think you may be able to facet it and get a decent gemstone out of it, looks pretty decent from the pics, especially the one with the long crystal like protrusion.

Mark
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55fossil
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« Reply #11 on: July 23, 2015, 08:19:17 am »

   I took a slice off the end last night. I only did a surface polish test on a corner. It took a great polish and appears to be moonstone. Really great glow chatoyant like effect in the light. There are a couple clear areas I may cut out for faceting or just cut some cabochons. Heavily included in  most areas but really pretty. I will take pictures when I get time to do more cutting.
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