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Lussatite

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Formula:
SiO2 · nH2O
Name:
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.
Synonym:
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).


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References for LussatiteHide

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Mallard, Ernest, 1890, Bull. Soc. Min., v. 13, p. 63.

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