Min. [ad. Du. Willemit (A. Levy, 1829), f. Willem William I. of the Netherlands.] Native silicate of zinc, abundant in New Jersey, found in masses or crystals of various colors from light greenish-yellow to flesh-red.
1850. Ansted, Elem. Geol., Min., etc., § 472.
1907. Times, 25 March, 15/3. To detect them [sc. certain rays] he used the luminiscence produced by them as they fell on willemite, which was the most sensitive substance he [sc. Professor Thomson] had discovered for the purpose.
