Difference between revisions of "Template:Quartz"
From The Gemology Project
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| Hardness || 7 | | Hardness || 7 | ||
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− | | Optic nature || | + | | Optic nature || U + |
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| Refractive index || 1.544 - 1.553 | | Refractive index || 1.544 - 1.553 |
Revision as of 18:26, 23 December 2006
Quartz | |
---|---|
Chemical composition | SiO2 Silicon dioxide |
Crystal system | Trigonal |
Habit | Prismatic |
Cleavage | Poor |
Fracture | Very brittle, conchoidal |
Hardness | 7 |
Optic nature | U + |
Refractive index | 1.544 - 1.553 |
Birefringence | 0.009 |
Dispersion | 0.013 |
Specific gravity | 2.65 |
Lustre | Vitreous |
Pleochroism | None |