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]

Doritonite
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 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]