Zircon Group – Zircon and Thorite Composition, Crystallization & Structure

Use. When transparent serves as a gem stone. It is sometimes colorless, but more often of a brownish and red-orange color, called hyacinth or jacinth. The colorless, yellowish or smoky stones are called jargon, because while resembling the diamond they have little value; and thence the name zircun. Serves as the source of zirconium oxide, which with other rare oxides is used in the manufacture of the Welsbach incandescent mantle.

Thorite
Thorium silicate, ThSi04, always with some water, probably from alteration, and sometimes uranium. Tetragonal. Crystal forms resemble those of zircon. Also massive. Resinous to greasy luster. H. = 4.5-5. G. = 4.8-5.2. Color orange-yellow, brown, black. Transparent to opaque. Infusible. Soluble in hydrochloric acid and gives gelatinous silica upon evaporation. A rare mineral, found chiefly in Norway, commonly altered. For uses of thorium sea under monazite.

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