Boussingaultite
From Infogalactic: the planetary knowledge core
| Boussingaultite | |
|---|---|
| General | |
| Category | Sulfate mineral |
| Formula (repeating unit) |
(NH4)2Mg(SO4)2·6(H2O) |
| Strunz classification | 07.CC.60 |
| Dana classification | 29.03.07.02 |
| Unit cell | a = 9.324(7) Å, b = 12.597(9) Å, c = 6.211(5) Å; β = 1.472°; Z = 2 |
| Identification | |
| Formula mass | 360.60 g |
| Color | Colorless, yellow pink, light yellow, pink; colourless in transmitted light |
| Crystal system | Monoclinic - prismatic |
| Cleavage | {201} perfect (synthetic) |
| Mohs scale hardness | 2 |
| Luster | Vitreous (glassy), silky |
| Streak | White |
| Diaphaneity | Transparent to translucent |
| Specific gravity | 1.73 |
| Density | 1.7 g/cm3 |
| Optical properties | Biaxial (+) |
| 2V angle | 51°11′ |
| Dispersion | r > v, perceptible |
| Solubility | Soluble in H2O |
| References | [1][2][3] |
Boussingaultite is a rare sulfate mineral of the chemical formula: (NH4)2Mg(SO4)2·6(H2O). The formula of boussingaultite is that of Tutton's salts type. It was originally described from geothermal fields in Tuscany, Italy, where it occurs together with its iron analogue mohrite,[4] but is more commonly found on burning coal dumps.[5] The mineral possess monoclinic symmetry and forms clear, often rounded crystals.[2]
The mineral is named after the French chemist Jean-Baptiste Boussingault (1802–1887).[6]
References
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- ↑ Fleischer M. 1965: New mineral names. American Mineralogist, 50, pp. 805
- ↑ Chesnokov B. V. and Shcherbakova E. P. 1991: Mineralogiya gorelykh otvalov Chelyabinskogo ugolnogo basseina - opyt mineralogii tekhnogenesa. Nauka, Moscow
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