Borate mineral
(repeating unit)MgB6O10·7H2O[1] or
MgB6O7(OH)6·4H2O[2] | | IMA symbol | Amt[3] |
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| Strunz classification | 6.FA.15 |
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| Dana classification | 26.6.3.1 |
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| Crystal system | Monoclinic |
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| Crystal class | Prismatic (2/m)
(same H-M symbol) |
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| Space group | P21/c |
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| Identification |
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| Color | colorless |
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| Cleavage | Absent |
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| Fracture | Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz) |
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| Mohs scale hardness | 2 - 3 - Gypsum-Calcite |
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| Streak | White |
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| Density | 1.82 - 1.87, Average = 1.84 |
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| Optical properties | Biaxial (−) |
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| Refractive index | nα = 1.442 nγ = 1.504 |
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| Birefringence | δ = 0.062 |
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| Dispersion | None |
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| References | [2][1][4] |
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Admontite is a hydrated magnesium borate mineral with formula MgB6O10·7H2O.
Occurrence - In a gypsum deposit. Associations: gypsum, anhydrite, hexahydrite, löweite, eugsterite, pyrite, quartz.
It is named after Admont, Austria. Its Mohs scale rating is 2 to 3.
See also
References
Look up admontite in Wiktionary, the free dictionary.
