Formula: (Cu,Fe)6Hg2S5
Origin of name: Form locality, Gortdrum deposit, Ireland
Crystal system: Orthorhombic
Crystal class: Unknown
Twinning:
Unit cell:
Colour: Blackish lead-gray
Diaphaneity: Opaque
Luster: Metallic
Habit: Submicroscopic grains
Hardness:
Specific gravity: 6.80
Cleavage: None
Tenacity:
Streak:
Synonyms/varieties:
Comments: Found only in polished section
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