Formula: Bi2Fe(PO4)O2(OH)2
Origin of name: for Paul Keller, German mineralogist
Crystal system: monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: greenish yellow
Diaphaneity: transparent
Luster: vitreous
Habit: wedge-shaped euhedral crystals 0.2 to 0.8 mm
Hardness: 4
Specific gravity: 6.17
Cleavage: none
Tenacity:
Streak: light yellow
Synonyms/varieties:
Comments:
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