Global InformationJarosewichite information
| Jarosewichite | |
|---|---|
| General | |
| Category | Arsenate mineral |
| Formula (repeating unit) | Mn2+3Mn3+(AsO4)(OH)6 |
| IMA symbol | Jrw[1] |
| Strunz classification | 8.BE.70 |
| Crystal system | Orthorhombic |
| Crystal class | Disphenoidal (222) H-M symbol: (2 2 2) |
| Space group | Cmmm or C222 |
| Unit cell | a = 6.56, b = 25.2 c = 10 [Å]; Z = 8 |
| Identification | |
| Color | Very dark red |
| Crystal habit | Prismatic crystals occurring typically as divergent sprays |
| Cleavage | None observed |
| Fracture | Irregular – uneven |
| Tenacity | Brittle |
| Mohs scale hardness | 4 |
| Luster | Subvitreous |
| Streak | Reddish orange |
| Diaphaneity | Translucent through thin edges |
| Specific gravity | 3.66 |
| Optical properties | Biaxial (−) |
| Refractive index | nα = 1.780 nβ = 1.795 nγ = 1.805 |
| Birefringence | δ = 0.025 |
| Pleochroism | Weak |
| 2V angle | Measured: 78° |
| References | [2][3][4] |
Jarosewichite is a rare manganese arsenate mineral with formula: Mn2+3Mn3+(AsO4)(OH)6.[2][3] It was first described in Franklin, New Jersey which is its only reported occurrence.[2] Its chemical composition and structure are similar to chlorophoenicite. This mineral is orthorhombic with 2/m2/m2/m point group. Its crystals are prismatic or barrel-shaped. The color of jarosewichite is dark red to black. It has subvitreous luster of fracture surfaces and reddish-orange streak. This mineral occurs with flinkite, franklinite, andradite and cahnite.
- ^ 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.
- ^ a b c Mindat.org
- ^ a b Webmineral data
- ^ Anthony, J. W., Bideaux, R. A., Bladh, K. W., Nichols, M. C. (1990)Handbook of Mineralogy Mineral Data Publishing. c1990-c2003.