tychite

noun

ˈtīˌkīt,

ˈtiˌk-

plural -s

: 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)

Word History

Etymology

Greek tychē + English -ite; from its chance discovery among other crystals

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