Nadorite
| Nadorite | |
|---|---|
 | |
| General | |
| Category | Halide mineral |
| Formula (repeating unit) | PbSbO2Cl |
| Strunz classification | 3.DC.30 |
| Crystal system | Orthorhombic |
| Crystal class | Dipyramidal (mmm) H-M Symbol: (2/m 2/m 2/m) |
| Space group | Bmmb |
| Identification | |
| Color | Brown, brownish-yellow, yellow |
| Twinning | On {101}, nearly perpendicular (91°45'), common |
| Cleavage | On {010}, perfect |
| Fracture | Uneven |
| Mohs scale hardness | 3+1⁄2 - 4 |
| Luster | Adamantine, Resinous |
| Streak | White, yellow to yellowish white |
| Diaphaneity | Translucent |
| Density | 7 |
| Refractive index | nα = 2.300 nβ = 2.340 - 2.350 nγ = 2.360 - 2.400 |
| Birefringence | δ = 0.060 - 0.100 |
| Dispersion | Strong |
| References | [1][2] |
Nadorite is a mineral with the chemical formula PbSbO2Cl.[1] It crystallizes in the orthorhombic crystal system and is brown, brownish-yellow or yellow in color, with a white or yellowish-white streak.[1]
Nadorite is named after Djebel Nador in Algeria, where it was first identified in 1870.[1] Djebel Nador and Djebel Debbar (both in the Constantine Province of Algeria) are its co-type localities.[1]
References
- ^ a b c d e "Nadorite". Mindat.org. Retrieved 2008-04-16.
- ^ Nadorite data at Webmineral