Min. Obs. [ad. Ger. thumerstein (Werner, 1788), f. Thum, in Saxony, where found.] A synonym of AXINITE. So † Thumite, in same sense.
1796. Kirwan, Elem. Min. (ed. 2), L. 273. Thumerstone,… Glass Shorl. [Ibid., 274. It is found crystallized in Dauphiné…, and amorphous in Saxony, near Thum, whence Mr. Werner calls it Thumerstein.
1802. [see AXINITE].]
1868. Dana, Min., 297. Axinite,… Thumerstein…. Thumite.
