It must be noted that the Idaho and Montana deposits are of high-grade thorite and
thorianite rather than low-grade disseminated deposits as in India, for example.
An intense program of stripping, trenching, geology and approximately 40,000 feet of diamond drilling was completed between 1953 and 1957 resulting in the delineation of a body of fluorite, yellow mica, uraniferous
thorianite, uranothorite, chondrodite and monazite within a calcareous marble.
5-cm
thorianite crystal, a "reinite" (ferberite pseudomorph after scheelite) from Uganda, and a razor-sharp dodecahedral betafite of about 2 cm.
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.
Thorianite has been identified from the Namivo-Tomeia-Nampoca group of pegmatites (DSGM, 1974).
