Formula: NaMg2Fe5(SO4)7(OH)6.33H2O
Origin of name: for F. Slavik, Czech mineralogist
Crystal system: hexagonal
Crystal class: unknown
Twinning:
Unit cell:
Colour: greenish yellow
Diaphaneity:
Luster: vitreous
Habit: crystals tabular, minute, crusts, scales, fine granular
Hardness:
Specific gravity: 1.89 to 1.99
Cleavage: none
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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