Formula: Ca6(Fe,Al,Mn)2(SO4)2[B(OH)4](OH)12.25H2O
Origin of name: for B. Darko Sturman, Croatian-Canadian mineralogist
Crystal system: hexagonal
Crystal class: 3m
Twinning:
Unit cell: a = 11.16 Å, c = 21.79 Å
Colour: bright yellow to yellow-green
Diaphaneity:
Luster: vitreous
Habit: crystals stubby to elongated prismatic, dipyramidal, to 2 cm
Hardness: 2.5
Specific gravity: 1.847
Cleavage: 1; {10-10} perfect
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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