Nadorite
Nadorite is a mineral with the chemical formula PbSbO2Cl.[2] It crystallizes in the orthorhombic crystal system and is brown, brownish-yellow or yellow in color, with a white or yellowish-white streak.[2]
| Nadorite | |
|---|---|
 | |
| General | |
| Category | Halide mineral |
| Formula (repeating unit) | PbSbO2Cl |
| IMA symbol | Nad[1] |
| 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 | [2][3] |
Nadorite is named after Djebel Nador in Algeria, where it was first identified in 1870.[2]
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.[2]
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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