ˈtīˌkīt, ˈtiˌk- noun
( -s )
Etymology: Greek tychē + English -ite; from its chance discovery among other crystals
: a rare mineral Na 6 Mg 2 (SO 4 )(CO 3 ) 4 that is an octahedral sulfate and carbonate of sodium and magnesium (hardness 3.5-4, specific gravity 2.59)