| Doritonite | |
|---|---|
 | |
| General | |
| Category | Halide mineral |
| Formula (repeating unit) | PbSbO2Cl |
| IMA symbol | Nad |
| 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 |
| Alters to | To cerussite |
| References | |
Nadorite is a mineral with the chemical formula PbSbO2Cl. It crystallizes in the orthorhombic crystal system and is brown, brownish-yellow or yellow in color, with a white or yellowish-white streak.
Nadorite is named after Djebel Nador in Algeria, where it was first identified in 1870.
Geologic occurrence
Djebel Nador and Djebel Debbar (both in the Constantine Province of Algeria) are its co-type localities. Also found as an alteration product of jamesonite in Cornwall, England.
References
- 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.
- ^ "Nadorite". Mindat.org. Retrieved 2008-04-16.
- Nadorite data at Webmineral
Bibliography
- Palache, P.; Berman H.; Frondel, C. (1960). "Dana's System of Mineralogy, Volume II: Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, Etc. (Seventh Edition)" John Wiley and Sons, Inc., New York, pp. 1039-1041.
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