Perite

Perite, from Blue Bell Claim, San Bernardino County, California, United States of America

General
Category| Halide mineral
Formula
(repeating unit)| PbBiO2Cl
Strunz classification| 3.DC.30
Crystal system| Orthorhombic
Crystal class| Dipyramidal (mmm)
H-M symbol: (2/m 2/m 2/m)
Space group| Bmmb
Unit cell| a = 5.62 Å, b = 5.57 Å,
c = 12.42 Å; Z = 4
Identification
Formula mass| 483.63 g/mol
Color| Yellow
Crystal habit| Platey crystals, pseudotetragonal
Cleavage| Fair on {001}
Mohs scale hardness| 3
|re|er}}| Adamantine
Streak| Yellow
Diaphaneity| Translucent
Specific gravity| 8.16
Optical properties| Biaxial (+)
Refractive index| ncalculated = 2.29 – 2.3
Pleochroism| Trichroic
References| [1][2][3][4][5]

Perite is a mineral that has a general chemical formula of PbBiO2Cl.[3] The name is given for Per Adolf Geijer, a Swedish economic geologist with the Geological Survey of Sweden, who discovered the mineral in 1960 outside of Långban, Sweden.[5] Perite is orthorhombic, space group Cmcm {C2/m 2/c 21/m}. In terms of its optical properties, Perite is anisotropic which means the velocity of light varies depending on direction through the mineral (i.e. it is birefringent). Its calculated relief is 1.45–1.461, which is moderate. It is colorless in plane polarized light, and it is weakly pleochroic. Perite is found in areas near igneous extrusions in places like the Western United States, Southern Australia, and scattered around Europe.

## Crystallography

Perite belongs to the orthorhombic crystal system, and has the properties of 2/m 2/m 2/m crystal class. Therefore, perite has three mirror planes and three twofold rotation axes.

## References

1. ↑ Mineralienatlas
2. ↑ Handbook of Mineralogy
3. ↑ 3.0 3.1 Mindat.org
4. ↑ Mincryst
5. ↑ 5.0 5.1 Webmineral data
6. ↑ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine 85 (3): 291–320. doi:10.1180/mgm.2021.43. Bibcode: 2021MinM...85..291W.

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