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Chemical Formula | SiO2 with organic compounds |
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Composition | Silicon dioxide with organic compounds |
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Color | Colorless, white, light yellow, light brown |
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Streak | White |
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Hardness | 6½ - 7 |
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Crystal Forms and Aggregates |
(Tetragonal) Occurs in pseudo-isometric crystals from the transformation of Beta Cristobalite. Crystals occur as small cubes, rounded in shape, appearing as small balls or blobs. |
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Transparency | Transparent to translucent |
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Specific Gravity | 2.0 |
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Luster | Vitreous |
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Cleavage | None |
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Fracture | Conchoidal |
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Tenacity | Brittle |
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Polymorphs | See Polymorphs of SiO2 |
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In Group | Silicates ; Tectosilicates ; Silica group |
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Striking Features | Occurrence, crystal shape, association with Sulfur |
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Popularity (1-4) | 4 |
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Prevalence (1-3) | 3 |
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Demand (1-3) | 3 |
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Distinguishing Similar Minerals |
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Commonly Occurs With |
Sulfur, Calcite, Celestine |
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Noteworthy Localities |
Fortullino Hill, Livorno, Italy and in Caltanisetta, Girgenti, Sicily, Italy. |
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Picture Icon Links |
Sorry. No Images currently available. |
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Picture Links | Sorry. No Images currently available. |
