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Formula | SiO2 |
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Crystal System | hexagonal | |
Crystal Habit | prismatic hexagonal crystals with horizontally striated faced; sometimes appears dursy: twinning common | |
Cleavage | seldom distinct | |
Color/Pleochroism | colorless, white, purple, yellow, brown, pink, blue |
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Optic Sign | Uniaxial (+) | |
Refractive Indices omega = epsilon = |
1.544 1.553 |
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Max Birefringence | 0.009 | |
Distinguishing Features | uniaxial; low relief; low birefringence | |
Occurrence | Quartz is extremly common and can be found in many types of igneous, sedimentary, and metamorphic rocks. | |
Editors | Christine Raczka (MHC '08), Caroline Hackett (Smith '14) |