thorianite

[′thȯr·ē·ə‚nīt]

(mineralogy)

ThO₂ A radioactive mineral that crystallizes in the isometric system, occurs in worn cubic crystals, is brownish black to reddish brown in color, and has resinous luster; hardness is 7 on the Mohs scale, and specific gravity is 9.7-9.8.

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References in periodicals archive ?

5-cm thorianite crystal, a "reinite" (ferberite pseudomorph after scheelite) from Uganda, and a razor-sharp dodecahedral betafite of about 2 cm.

Sainte-Marie-aux-Mines Show 2001. (What's New in Minerals)

Melanocerite, ortholavenite, loparite, thorite, thorianite, eudialyte, perrierite, chevkinite, zircon, leucophanite, catapleiite, astrophyllite, tainiolite, calcium-rich seidozerite are found in nepheline-albite phenites at the exocontact.

THE MINERALS OF RUSSIA: 22ND ANNUAL FM-TGMS-MSA MINERALOGICAL SYMPOSIUM

Thorianite has been identified from the Namivo-Tomeia-Nampoca group of pegmatites (DSGM, 1974).