Formula: CaMgFe(PO4)2(OH).4H2O
Origin of name: for Curt Segeler, American amateur mineralogist
Crystal system: orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell: a = 14.83 Å, b = 18.75 Å, c = 7.307 Å
Colour: pale green to pale yellow, yellow-green, nearly colourless
Diaphaneity:
Luster: vitreous to subadamantine
Habit: crystals elongated, striated parallel to elongation, nearly square cross section, to 1 mm
Hardness: 4
Specific gravity: 2.67
Cleavage: 1; {010} perfect
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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