Boracite



a strongly pyroelectric mineral, a borate and chloride of magnesium, Mg 6 Cl 2 B 14 O 26 , occurring in white or colorless cubic crystals or fine-grained masses.
Historical Examples

Encyclopaedia Britannica, 11th Edition, Volume 3, Part 1, Slice 2 Various
Encyclopaedia Britannica, 11th Edition, Volume 4, Slice 3 Various
Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 7 Various
Encyclopaedia Britannica, 11th Edition, Volume 4, Slice 2 Various

noun
a white mineral that forms salt deposits of magnesium borate and chloride in orthorhombic crystalline form. Formula: Mg3ClB7O13

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