Post subject: Quiz for all, especially GTP owners!
Posted: Sun Nov 26, 2006 10:54 pm
Site Admin
Joined: Sun Oct 16, 2005 12:22 pm Posts: 21602 Location: San Francisco
All the stones above have similar visual tones. All the stones above are different gems. Name that stone!
Using standard gemological tools:
1. Polariscope: doubly refractive
Refractive Index: Over the limit
Specific gravity: 3.52
Pleochroism: 3 colors
Extra: With magnification, I can see a splintery fracture
2. Polariscope: doubly refractive
Refractive Index: 1.643-1.634: Biaxial
Specific gravity: 3.17
Pleochroism: 3 colors
Extra: Spectroscope: strong line at 553
3. Polariscope: doubly refractive
Refractive Index: 1.688-1.678
Specific gravity: 3.29
Pleochroism: 3 colors
Extra: With magnification, concoidal fracture
4. Polariscope: doubly refractive: Bulls-eye with coniscope
Refractive Index: 1.553-3.544
Specific gravity: 2.65
Pleochroism: 2 colors
Extra: With magnification, I can see a concoidal fracture
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