Formula: Ca(Mn,Fe)2Be3(PO4)3(OH)3.2H2O
Origin of name: for W. Roscher, German collector
Crystal system: monoclinic and triclinic
Crystal class: 2/m and -1
Twinning:
Unit cell: monoclinic: a = 15.97 Å, b = 11.93 Å, c = 6.62 Å, b = 95.2°
Colour: olive-green, light brown, dark brown, reddish brown, red
Diaphaneity:
Luster:
Habit: crystals tabular, short prismatic with 6 or 8 sides, aggregates of thin plates, massive, radiating fibrous
Hardness: 4.5
Specific gravity: 2.93
Cleavage: 2; {001} good, {010} distinct
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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