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15,651 users

Please identify this crystal

0 votes

Hi 

This crystal has a very good shiny surface, can see cracks and bruises (I think there might be strong blow), hardness is about 9 and the S. G is 2.70. Indian origin. 

asked Oct 10 by Gopillm (830 points)
edited 18 hours ago by Gopillm

3 Answers

0 votes
My best guess would be corundum, considering the flourescence and the hardness. Corundum is the mineral that ruby and sapphire is composed of, it is found in India, and it can be flourescent. A very beautiful specimen, likely worth a lot of money. What a cool piece!
answered Oct 10 by linkisnotzelda (4,150 points)
But the specific gravity explains as quartz
I think its highly unlikely that its corundum. Clear corundum in such gem quality is extremely rare, and i've never seen anything like that in Corundum from India or from anywhere in fact. Most Indian corundum is dark and opaque, or at least translucent.
You are probably right. I have more experience with other minerals and was just trying to help. Sorry. :(
0 votes
Quartz7.0, chalcedony 7.0, corundum 9.0chrysoberyl 8.5 Mohs scale values.
answered Oct 10 by Weasel (54,570 points)
So which one would fit in this
I understand your point about the specific gravity, but I think most of the evidence points to corundum.
0 votes
This does not appear to be quartz. The striations are oriented vertically rather than horizontally and are too strong. And the fracture is a bit more hackly than quartz which is highly conchoidal. Corundum is also not a valid assumption as it's got the wrong striations and is pretty much never in that habit and color form combined (at least not naturally.)

My best bet would be topaz or phenakite, with a slight misjudgment on your hardness of 9 to be very slightly lower. One other possibility would be euclase. All of these are very rare to unheard of from India, so it would be worth looking into the source of these for more. I would definitely recommend you take it to be tested.
answered 1 day ago by hershel (51,300 points)
Asking out of curiosity are these type of crystals are of any value? Or just a collectors piece?
Depends on the actual analysis. If its in fact a phenakite, then yes, as that is a very rare mineral. If it's topaz, the lack of a good crystal shape will limit its value.
By the way, there are tiny black pepper spots inside that stone, may I know what are they and what causes it?  Is it any way appears to be beryl?  Coz the specific gravity directs in that way I feel.
Uploaded a few more pics with led torch at the back at night.
Yes, perhaps Beryl can also be an option, though usually beryl is more distinctively shaped with well-formed hexagonal crystals. Colorless beryl like that (goshenite) is not so common.
 


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