Partheite
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| Partheite | |
|---|---|
| Category | Silicate mineral |
| Chemical formula | Ca2Al4Si4O15(OH)2·4(H2O) |
| Identification | |
| Color | White, colourless |
| Crystal habit | Fibrous, radial |
| Crystal system | monoclinic prismatic |
| Cleavage | {100} and {110} |
| Mohs Scale hardness | 4 |
| Luster | vitreous |
| Refractive index | nα = 1.547 - 1.550 nβ = 1.549 - 1.552 nγ = 1.559 - 1.565 |
| Optical Properties | Biaxial (+) |
| Birefringence | δ = 0.012 - 0.015 |
| Streak | white |
| Specific gravity | 2.39 - 2.45 |
| References | [1][2] |
Partheite or parthéite is a calcium aluminium silicate found in rodingites, metasomatically altered rocks associated with the formation of serpentinite. Partheite and lawsonite are polymorphs. It has been described from rodingite dikes within an ophiolite sequence in Turkey and in veins within a gabbroic intrusion, the Denezhkin Kamen complex, Russia. Associated minerals include prehnite, thomsonite, augite, chlorite and tremolite.[3]
It was first described in 1979 and named for the Swiss crystallographer Erwin Pathé (1928-2006).
[edit] References
- ^ http://webmineral.com/data/Partheite.shtml Webmineral
- ^ http://www.mindat.org/min-3127.html Mindat
- ^ http://www.handbookofmineralogy.org/pdfs/Partheite.PDF Handbook of Mineralogy
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