Formula: CdS
Origin of name: for Lord Greenock, English collector
Crystal system: hexagonal
Crystal class: 6mm
Twinning: rare on {11-22} trillings
Unit cell: a = 4.136 Å, c = 6.173 Å
Colour: yellow, orange to deep red
Diaphaneity:
Luster: adamantine to resinous
Habit: crystals pyramidal, hemimorphic, thick tabular, or prismatic, horizontal striations, earthy coating
Hardness: 3 to 3.5
Specific gravity: 4.82
Cleavage: 2; {11-22} distinct, {0001} imperfect
Tenacity: conchoidal, brittle
Streak: orange-yellow to brick red
Synonyms/varieties:
Comments: dimorphous with hawleyite
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