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Purchased online, what is this blueish green stone?
  
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Virginia Slim




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PostPosted: Jul 03, 2019 09:48    Post subject: Purchased online, what is this blueish green stone?  

I'm in the middle of polishing this guy & I just realized I have no idea what it is. I'm not very good on identifying anything that's blue or green in color, so my apologies for being kind of ignorant on this subject. To me it kind of looks like blue/green apatite but again it's hard to determine with it being so small. It's not incredibly hard and it's fairly easy to sand down with a dremel but not nearly as soft as calcite. It has ridges and a little bit of simmer under sunlight.


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 Mineral: Apatite
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Bob Harman




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PostPosted: Jul 03, 2019 12:15    Post subject: Re: Purchased online, what is this blueish green stone?  

Small pieces like you show are quite generic altho that color is quite interesting. A small piece of massive fluorite might be a possibility.

But I would not be surprised to find out that your piece is nothing more than an artificially dyed piece of quartzite.

For example, if you were to take an artificially blue dyed agate and break it into small pieces, some of the small pieces might look like your photo.

I am just not sure........BOB
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vic rzonca




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PostPosted: Jul 03, 2019 12:42    Post subject: Re: Purchased online, what is this blueish green stone?  

The seller gave no identification? It's a good idea to get an ID from the supplier. Otherwise, see below.


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Susan Robinson




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PostPosted: Jul 03, 2019 14:08    Post subject: Re: Purchased online, what is this blueish green stone?  

Looks like chrysocolla to me.
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Bob Carnein




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PostPosted: Jul 03, 2019 17:27    Post subject: Re: Purchased online, what is this blueish green stone?  

My two cents worth says it might be apatite. Hardness would be slightly softer than a knife blade; is it translucent? Do you know where it's from?
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Riccardo Modanesi




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PostPosted: Jul 15, 2019 14:13    Post subject: Re: Purchased online, what is this blueish green stone?  

Hi to everybody!
Have you tried by making it react with chloridric acid? And what about its hardness? Have you tried to scratch it using an iron piece or a piece of glass?
Greetings from Italy by Riccardo.

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Hi! I'm a collector of minerals since 1973 and a gemmologist. On Summer I always visit mines and quarries all over Europe looking for minerals! Ok, there is time to tell you much much more! Greetings from Italy by Riccardo.
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Tobi




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PostPosted: Jul 16, 2019 03:09    Post subject: Re: Purchased online, what is this blueish green stone?  

I'm not a fan of the guesses just by photos, but I agree that this really looks like fluorapatite (could be from Sludyanka/Russia or Ipirá/Brazil) ...
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Bob Harman




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PostPosted: Jul 16, 2019 07:09    Post subject: Re: Purchased online, what is this blueish green stone?  

I now agree with Tobi. ID of a small specimen from a photo is usually just an educated guess.

Also, let us be realistic and pragmatic here. Testing of small thumbnail size specimens (see the photos), as has just been suggested, will essentially diminish or ruin many small specimens, whatever they may be. There is only so much you can do with a small thumbnail size specimen, keeping it intact and collectible.

Let me clarify that if I had an unidentified mineral specimen of only thumbnail size, I would have to think long and hard before dropping it into acid or chipping off a piece to do the same. Also I would be reticent before scratching it to determine hardness or do a streak test, also scratching it's surface. BOB
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Josele




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PostPosted: Jul 16, 2019 12:52    Post subject: Re: Purchased online, what is this blueish green stone?  

My crystal ball says:
If it is from Bahía (Brasil) it could be fluorapatite.
If it is from Madagascar then it could be grandidierite.
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