Terlinguaite is a rare mercury chloride which occurs as monoclinic, flattened, prismatic, yellow-green, pale olive green to brown, adamantine, translucent crystals. Terlinguaite is named after its discovery locality: Mariposa mine, Terlingua district, Brewster Co., Texas, USA, a vein-type mercury deposit. Associated minerals include montroydite and eglestonite. Other US localities include: McDermitt mine (Cordero mine), Opalite District, Humboldt Co., Nevada; and in California at the Emerald Lake mine and the Challenge deposit, San Mateo Co., and the Clear Creek mine, New Idria district, San Benito Co. Other notable localities include: Khaidarkan Sb-Hg deposit, Fergana Valley, Alai Range, Osh Oblast, Kyrgyzstan; Dulces Nombres mine, Hacienda de Santa Antonio de Rul, Moctezuma, San Luis Potosi, Mexico; and Landsberg (Moschellandsberg), Alsenz-Obermoschel, Rhineland Palatinate, Germany.
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