Tridymite (Low Tridymite)

Origin Of Name

From Greek "threefold", triangular wedge-shaped crystals

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Tridymite is a low pressure, high-temperature-stable Polymorph of Silica that can form metastably at low temperatures

Physical Properties

. Hardness- 6 to 7

. Specific Gravity- 2.28

. Clevage- None

. Fracture- Conchoidal

. Luster- Vitreous

. Transparency- Transparent to translucent

. Colour- Colourless

. Streak- White

Crystal Structure- Orthorhombic