Formula: (Ca,Ba)Ca8(Fe,Mn)4Al2(PO4)10(OH)2
Origin of name: for P. Samuelson, American prospector
Crystal system: monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: colourless
Diaphaneity:
Luster: subadamantine
Habit: crystals elongated and striated, to 1 mm
Hardness: 5
Specific gravity: 3.353
Cleavage: 1; {001} fair
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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