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Named by Ernest Mallard in 1890 for a chalcedony-like material with unique properties from Lussat, near Pont-du-Chateau, Puy-de-Dome. Associated with opal and quartz.
A synonym of Opal-CT
"A form of silica, similar in structure to chalcedony, but having a low specific gravity, G = 2.04, near that of opal; refractive index (for D) 1.446 like opal, but crystalline and optically positive." Mallard, 1890.
References for Lussatite
Mallard, Ernest, 1890, Bull. Soc. Min., v. 13, p. 63.
Internet Links for Lussatite