Formula: NaFe3(SO4)2(OH)6
Origin of name: from natrium = sodium and jarosite
Crystal system: hexagonal
Crystal class: -3 2/m
Twinning:
Unit cell:
Colour: ocher yellow to brown
Diaphaneity: transparent to translucent
Luster: vitreous
Habit: crystals tabular, hexagonal outline or pseudocubic, minute, crusts or coatings, earthy
Hardness: 3
Specific gravity: 3.18
Cleavage: 1; {0001} perfect
Tenacity:
Streak: pale yellow
Synonyms/varieties:
Comments: Na analogue of jarosite
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