Formula: (UO2)8(SO4)2(OH)14 . 13H2O
Origin of name: After locality; Jachymov, Czech Republic
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: Yellow
Diaphaneity: Translucent
Luster: Vitreous
Habit: Acicular crystals to 0.1 mm long forming coatings to 1 cm wide
Hardness:
Specific gravity: 4.79
Cleavage: 1; {010} good
Tenacity:
Streak: Pale yellow
Synonyms/varieties:
Comments: Fluoresces yellow
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