Formula: PbSbO2Cl
Origin of name: after locality Djebel Nador, Qacentina, Algeria
Crystal system: orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning: common on {101}
Unit cell: a = 5.60 Å, b = 5.44 Å, c = 12.22 Å
Colour: grayish brown, brownish yellow to yellow
Diaphaneity:
Luster: resinous to adamantine
Habit: crystals tabular or prismatic, or lenticular with octagonal or square outline, divergent or subparallel groups
Hardness: 3.5 to 4
Specific gravity: 7.02
Cleavage: 1; {010} perfect
Tenacity: brittle
Streak:
Synonyms/varieties:
Comments:
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