Formula: Ca14Mn3Zn2(Zn,Be)2Be6(SiO4)6(Si2O7)4(OH,F)6
Origin of name: for Sam Fowler, American doctor
Crystal system: monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: colourless
Diaphaneity: transparent
Luster: vitreous
Habit: crystals to 0.05 mm in clusters to 0.5 mm
Hardness: 3
Specific gravity: 3.28
Cleavage: none
Tenacity:
Streak: white
Synonyms/varieties:
Comments: fluoresces weak red in LW and SW ultraviolet light
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