Min. [f. Gr. θΐς, θῑν- (see prec.) + λίθος stone: see -LITE.] ‘A variety of calcite, occurring in pseudomorphous crystals, the original mineral being still in doubt’ (Chester, Dict. Min., 1896).
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1879. C. King, Geol. 40th Parallel, I. 508 (Chester).
