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Cristobalite

Origin of Name
Named after occurence at Gerro San Cristobal, Mexico.

    Copyright: Pinterest.com

Cristobalite is a Polymorph of Silica that is formed at very high temperatures.

Physical Properties
. Hardness- 6.5
. Specific Gravity- 2.33
. Clevage- None
. Fracture- Conchoidal
. Luster- Vitreous
. Transparency- Translucent to transparent
. Colour- Colourless, 
. Streak- White
. Tenacity- Brittle

Crystal System- Tetragonal
Uses- In dentistry as a component of a alginate impression materials as well as for making models of teeth. 
Silicate Structure- Tectosilicate

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