Template:Rock Crystal

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Revision as of 19:52, 9 February 2007 by Tom Goodwin, G.G. (talk | contribs) (Edited "Clear" to Colorless. "Clear" is expected to be confused with clarity rather than color.)
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Rock Crystal (Colorless 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 Low, 0.013
Specific gravity 2.65
Lustre Vitreous
Pleochroism None