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MINERAL IDENTIFICATION PROJECT |
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Hard- ness |
Cleavage |
Fracture |
Trans- parency |
10% HCl Reaction |
SG |
Luster |
Color |
Streak |
Xtal Form |
Mineral Class |
Comments | opal | 5.50 | none | conchoidal | Translucent | none | 1.90 | waxy | white | white | microcrystalline | silicates | Color highly variable but usually contains pale white. Look for iridescence. |
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