Difference between revisions of "Peridot"
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− | [[Image: | + | [[Image:Ovalperidot.JPG|left|framed|Flawless faceted Peridot <br />Photo courtesy of Lembeck Gems]] <br clear="left" /> |
Revision as of 13:45, 9 January 2007
Peridot | |
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Chemical composition | (Mg,Fe)2SiO4 |
Crystal system | Orthorhombic |
Habit | Prismatic |
Cleavage | Poor |
Fracture | Conchoidal |
Hardness | 6.5 |
Optic nature | Biaxial + |
Refractive index | 1.65 - 1.69 |
Birefringence | 0.036 |
Dispersion | Medium, 0.020 |
Specific gravity | 3.34 |
Lustre | Vitreous |
Pleochroism | Weak |