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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