Formula: Al(SO4)(OH,F).5H2O
Origin of name: for Rudolph Rost, Czech mineralogist
Crystal system: orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell:
Colour: white
Diaphaneity:
Luster:
Habit: well-formed crystals 0.002 by 0.006 by 0.01 to 0.05 mm forming chalky nodules 1 to 8 cm across
Hardness:
Specific gravity: 1.892
Cleavage: none
Tenacity:
Streak:
Synonyms/varieties:
Comments: dimorphous with jurbanite
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