Nadorite

Nadorite
General
Category	Halide mineral
Formula	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 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 is named after Djebel Nador in Hammam N'Bail, Algeria, where it was first identified in 1870. ^[2]

Geologic occurrence

Djebel Nador and Djebel Debbar (both in the Guelma Province of Algeria) are its co-type localities. Also found as an alteration product of jamesonite in Cornwall, England. ^[2]

References

1. 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.
2. "Nadorite". Mindat.org . Retrieved 2008-04-16.
3. 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.