Formula: CaAlB3O7
Origin of name: From locality; Johachido District, North Korea
Crystal system: Orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell:
Colour: Colourless to whitish
Diaphaneity: Transparent
Luster: Vitreous
Habit: Grains and lamellar masses
Hardness: 7.5
Specific gravity: 3.37
Cleavage: None
Tenacity:
Streak:
Synonyms/varieties:
Comments: Fluoresces intense blue
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