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Chemical Formula | SiO2 |
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Composition | Silicon dioxide |
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Color | Colorless to white |
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Streak | White |
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Hardness | 7½ - 8 |
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Crystal Forms and Aggregates |
(Monoclinic) Occurs only in microscopic prismatic and tabular crystals. It is usually as a white dust or glassy material around Quartz sand pebbles. A synthetic form has been produced with large crystals resembling those of Gypsum. |
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Transparency | Transparent to translucent |
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Specific Gravity | 3.0 |
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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 May be classified as an oxide by a few abstract references (Oxide ; Simple oxide) |
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Striking Features | Occurrence, hardness |
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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 |
Iron/Iron-Nickel, Diamond, Garnet, Quartz |
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Noteworthy Localities |
Natural Coesite has been reported in the Barringer Crater (also known as Meteor Crater) in Coconino Co., Arizona; Sinking Springs Crater, Ohio; the Kentland crater, Newton Co., Indiana; the Riess-kessel Crater, Bavaria, Germany; Kimberly, South Africa; and the western coast of Namibia. |
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Picture Icon Links |
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Picture Links | Sorry. No Images currently available. |
