|
Hard- ness |
Cleavage |
Fracture |
Trans- parency |
10% HCl Reaction |
SG |
Luster |
Color |
Streak |
Xtal Form |
Mineral Class |
Comments | cristobalite | 7.00 | none | conchoidal | Transparent | none | 2.30 | glassy | clear | white | faceted | silicates | Crystals rare, usually crusts in cavities in Feldspar rich andesites, rhyolites, obsidian, etc. |
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