Hazenite
| Hazenite | |
|---|---|
| General | |
| Category |
Phosphate mineral Struvite group |
| Formula (repeating unit) | KNaMg2(PO4)2·14H2O |
| Strunz classification | 8.CH.40 |
| Dana classification | 40.01.01.03 |
| Crystal system | Orthorhombic |
| Crystal class |
Dipyramidal (mmm) H–M Symbol: (2/m 2/m 2/m) |
| Space group | Pmnb |
| Unit cell |
a = 6.9349, b = 25.1737 c = 11.2189 [Å]; Z = 4 |
| Identification | |
| Formula mass | 276.331 g/mol |
| Color | Colorless |
| Crystal habit | Radiating elongated tabular or prismatic clusters or single bladed tabular crystals |
| Cleavage | {001} Good |
| Tenacity | Brittle |
| Mohs scale hardness | 2 - 2.5 |
| Luster | Vitreous |
| Streak | White |
| Diaphaneity | Transparent |
| Specific gravity | 1.91 |
| Optical properties | Biaxial (+) |
| Refractive index | nα =1.494(1), nβ = 1.498(1), nγ = 1.503(1) |
| 2V angle | 41° |
| Dispersion | Strong r < v |
| Solubility | In water |
| References | [1][2][3][4] |
Hazenite is a hydrous phosphate mineral with chemical formula of KNaMg2(PO4)2·14H2O, therefore a hydrous alkali magnesium phosphate. It is a member of the struvite group.
It was first described for an occurrence adjacent to Mono Lake, California, and named after Robert M. Hazen of the Carnegie Institute.[5] It was approved as a new mineral on February 28, 2008 by the Commission on New Minerals of the International Mineralogical Association.
It occurs as crystal clusters associated with decomposed algae remnants on calcite or aragonite. It is precipitated by microbes in the highly-alkaline environment of Mono Lake.[2]
References
- ↑ Mindat.org
- 1 2 Webmineral data
- ↑ Hexiong Yang, Henry J. Sun and Robert T. Downs, Hazenite, KNaMg2(PO4)2⋅14H2O, a new biologically related phosphate mineral, from Mono Lake, California, U.S.A., American Mineralogist, Volume 96, pages 675–681, 2011
- ↑ http://archive.is/http://hazen.gl.ciw.edu/node/270 Carnegie Institute
- ↑ New mineral to be named "Hazenite" after Robert Hazen — Carnegie Institution for Science (Geophysical Laboratory)
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