Formula: NaCaY(F,Cl)6
Origin of name: For Yuri Gagarin, Russian astronaut
Crystal system: Hexagonal
Crystal class: 6/m
Twinning:
Unit cell:
Colour: Cream, yellowish, rose
Diaphaneity:
Luster: Dull to vitreous
Habit: Massive, crystalline and cryptocrystalline
Hardness: 4.5
Specific gravity: 4.21
Cleavage: 1; prismatic fair
Tenacity:
Streak: White
Synonyms/varieties:
Comments:
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