Formula: PbFe3H(AsO4)2(OH)6
Origin of name: Named after E. Ralph Segnit (1923-) for his contributions to Australian mineralogy.
Crystal system: Trigonal
Crystal class: 3 2/m
Twinning:
Unit cell: a = 7.359, c = 17.113
Colour: Greenish to yellowish-brown
Diaphaneity: Transparent to translucent
Luster: Adamantine
Habit:
Hardness: 4
Specific gravity:
Cleavage: Good
Tenacity:
Streak: Light yellow
Synonyms/varieties:
Comments:
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