Huttonite was first described in 1950 from beach sand and fluvio-glacial deposits in type location, where it is accompanied by scheelite, cassiterite, zircon, uranothorite, ilmenite and gold.
32.
Scheelite's refractive index ( 1.918 1.937 uniaxial positive, with a maximum birefringence of 0.016 ) and dispersion ( 0.026 ) are both moderately high.
33.
The mineral has tetragonal crystal symmetry and the same structure as scheelite ( calcium tungstate, CaWO 4 ), but can be metamict ( amorphous ) due to radiation damage from its small content of thorium.
34.
The Falcon Continuous ( C ) centrifugal concentrator is primarily used for the separation of heavy minerals which occur in ore concentrations above 0.1 % by weight, such as cassiterite, tantalum and scheelite.
35.
When present together in solid solution, energy is transferred from the higher-energy tungsten to the lower-energy molybdenum, such that fairly low levels of molybdenum are sufficient to cause a yellow emission for scheelite, instead of blue.
36.
Gold mining throughout the United States came to a halt, but Independence Mine was permitted to continue to operate because of the presence of scheelite, an ore of the " strategic mineral " tungsten, which occurs in the quartz lode with the gold.
37.
The Falcon Ultra-Fine ( UF ) centrifugal concentrator is primarily used for the separation of heavy minerals which occur in ore concentrations above 0.1 % by weight, such as cassiterite, tantalum and scheelite when the majority of the particles are smaller than 75 �m.
38.
NH 4 ReO 4 can be regarded as the prototype structure of a family of ammonium scheelites, which include the pertechnetate ( NH 4 TcO 4 ), periodate ( NH 4 IO 4 ), tetrachlorothallate ( NH 4 TlCl 4 ) and tetrachloroindate ( NH 4 InCl 4 ).
39.
The visible absorption spectrum of scheelite, as seen by a hand-held ( direct vision ) spectroscope, may also be of use : Most natural stones show a number of faint absorption lines in the yellow region of the spectrum ( ~ 585 nm ) due to praseodymium and neodymium trace impurities.
40.
This was accomplished either in the presence of short wave ( 2540 ?) fluorescent light, where the dull white fluorescence distinguishes it from scheelite ( fluoresces blue ) and zircon ( fluoresces yellow ), or by first boiling the impure sample in hydrochloric acid to induce an oxide surface on scheelite and permitting handpicking under visible light.
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