Formula: Na6(CO3)(SO4)2
Origin of name: For William Burke, American chemical engineer
Crystal system: Orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell:
Colour: White, pale tan, greyish
Diaphaneity: Transparent
Luster: Vitreous to greasy
Habit: Crystals tabular; massive, spherical to irregular nodules, reticulated aggregates
Hardness: 3.5
Specific gravity: 2.57
Cleavage: None
Tenacity:
Streak:
Synonyms/varieties:
Comments: Soluble in water
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