Joined: Sun Oct 16, 2005 12:22 pm Posts: 21602 Location: San Francisco
All the stones above have similar colors. All the stones above are different gem minerals. Name that stone!
Using standard gemological tools:
1. Polariscope: singly refractive
Refractive Index: 1.434
Specific gravity: 3.18
Pleochroism: none
Extra: With magnification, I can see a splintery fracture
7. Polariscope: doubly refractive
Refractive Index: 1.619-1.627
Specific gravity: 3.53
Pleochroism: none
Extra: With magnification, I can see a splintery fracture
9. Polariscope: doubly refractive
Refractive Index: 1.691-1.700
Specific gravity: 3.35
Pleochroism: strong blue and purple
Extra: With magnification, I can see a evidence of cleavage in a fracture
10. Polariscope: doubly refractive
Refractive Index:1.757-1.804
Specific gravity: 3.68
Pleochroism: Strong, colorless and blue
Extra: high dispersion
Joined: Sun Nov 19, 2006 5:51 pm Posts: 481 Location: Las Cruces, NM
Well, I'm a rookie and don't have any reference except an old mineralogy text, but I'll try a few.
1 Flourite
2 Lazulite
3 ?
4 Aqua
5 sapphire
6 spinel
7 ?
8 ?
9 Tanzanite
10 iolite
Joined: Mon Oct 17, 2005 2:39 pm Posts: 3528 Location: San Francisco Bay Area, CA
I was joking about number 8 being obvious. Hauyne is one of those stones that you just don't see that often. I probably wouldn't have got it without the software to help.
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