Global InformationPeretaite information
 | This article needs additional citations for verification. (March 2020) |
| Peretaite | |
|---|---|
| General | |
| Category | Sulfate |
| Formula (repeating unit) | Ca(SbO)2(SO4)2(OH)2 · 2H2O |
| IMA symbol | Pta[1] |
| Crystal system | Monoclinic |
| Identification | |
| Color | Colorless, can be pink |
| Crystal habit | Prismatic crystals |
| Twinning | Very common on {100} |
| Cleavage | Perfect on {100} |
| Mohs scale hardness | 3.5-4 |
| Luster | Vitreous |
| Streak | White |
| Diaphaneity | Transparent |
| Specific gravity | 4.06 |
| Density | 3.8 g/cm3 |
| Optical properties | biaxial positive |
| Refractive index | nα= 1.686 nβ= 1.694 nγ= 1.709 |
| Pleochroism | Strong with colors pink(γ') to green(α') |
| Ultraviolet fluorescence | No |
| References | [2] |
Peretaite is a sulfate of antimony and calcium. The mineral, Ca(SbO)4(SO4)2(OH)2 (2(H2O)), was named Peretaite for its locality. It was first discovered in an antimony-bearing vein at Pereta, Tuscany, Italy.
- ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
- ^ Nicola Cipriani, Silvio Menchetti, Paola Orlandi, Cesare Sabelli, 1980, "Peretaite a new mineral from Pereta, Tuscany, Italy", American Mineralogist, vol 65, pg 936-946.