tychite

tychite: \\ˈtīˌkīt, ˈtiˌk-\ noun (-s)
Etymology: Greek tychē + English -ite; from its chance discovery among other crystals

: a rare mineral Na₆Mg₂(SO₄)(CO₃)₄ that is an octahedral sulfate and carbonate of sodium and magnesium (hardness 3.5-4, specific gravity 2.59)

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tychite Min.
(ˈtaɪkaɪt)

[f. Gr. τύχη fortune, chance + -ite¹, in reference to its accidental discovery.]

A rare mineral consisting of carbonate and sulphate of magnesium and sodium, crystallizing in colourless octahedrons.

in Cent. Dict. Suppl.

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