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16.5.8: Smokey Quartz

Last updated

May 6, 2022
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- 16.5.7: Sunset Quartz
- 16.06: Quartz - Polycrystalline

gemology
Gemology Project

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Smoky Quartz
Chemical composition	SiO₂ Silicon dioxide
Crystal system	Trigonal
Habit	Prismatic
Cleavage	Poor
Fracture	Conchoidal
Hardness	7
Optic nature	Uniaxial +
Refractive index	1.544 - 1.553
Birefringence	0.009
Dispersion	0.013
Specific gravity	2.65
Lustre	Vitreous
Pleochroism	Weak to moderate

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