Formula: Na2Ca(Mg,Mn)7(PO4)6
Origin of name: For John Somerville, discoverer of mineral
Crystal system: Hexagonal
Crystal class: unknown
Twinning:
Unit cell:
Colour: Brown
Diaphaneity:
Luster: Vitreous
Habit:
Hardness: 4.5
Specific gravity: 3.35
Cleavage: 1; Basal perfect
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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