Nadorite

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
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
Alters to	To cerussite
References	[1][2]

Nadorite is named after Djebel Nador in Algeria, where it was first identified in 1870.[1]

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.[1]

References

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