Formula: Ca6Mn2(SO4,CO3)4(OH)12 . 26H2O
Origin of name: For Georges Jouravsky, geologist in Morocco
Crystal system: Hexagonal
Crystal class: 6
Twinning:
Unit cell:
Colour: Bright yellow, greenish yellow to greenish orange
Diaphaneity:
Luster:
Habit: Embedded grains, tiny
Hardness: 2.5
Specific gravity: 1.95
Cleavage: 1; {100} good
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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