|
Hard- ness |
Cleavage |
Fracture |
Trans- parency |
10% HCl Reaction |
SG |
Luster |
Color |
Streak |
Xtal Form |
Mineral Class |
Comments | chert (quartz) | 7.00 | none | conchoidal | Translucent | none | 2.65 | glassy | grey | white | microcrystalline | silicates | Color highly variable, but usually greens, reds and browns. Found in marine deposits. |
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