RARE EARTH EPIDOTE FROM PEGMATITES OF THE MIDDLE URALS (in Russian)
A rare-earth yttrium-bearing epidote was discovered in granite pegmatites in Slyuda mountain in the Middle Urals. The mineral appears in pegmatite vein No. 4 as black, lenticular, columnar, or isometric structure of several millimeters of 70 cm at its largest parameter. All rare-earth epidotes of the region have crystalline shapes with poorly outlined faces. They appear as elongated, plane-prismatic crystals of monocline syngony. The crystals are zonal with luster areas followed by dull areas; the mineral is friable, the microhardness is 943.8 kg/mm/sup 2/, the specific gravity is 3.29. The rare- earth epidote is radioactive but does not luminesce, is not electroconducting or magnetic. Radiochemical analysis showed 23 times rmore uranium than thorium (0.14% U and 0.006% Th). The content of the epidote in percent of total rare earths is: Ce, 7.8; Dy, 13.7; Er, 30.7; Eu, 1.0; Gd, 5.8; Ho, 3.9; La, 2.4; Lu, 3.9; Nd, 2.4; Pr, 1.0; Sm, 2.0; Tb, 1.0; Tu, 4.9; and Yb, 19.5. In addition, Cu, Ga, Mg, Na, and Ni and traces of Le, Pb, Se, and Sn were found. The age of the mineral is --1.0 x 10/sup 9/ years. (R.V.J.)
- Research Organization:
- Inst. of Mineralogy, Geochemistry and Crystal Chemistry of Rare Elements, Academy of Sciences, U.S.S.R.
- NSA Number:
- NSA-13-021046
- OSTI ID:
- 4221027
- Journal Information:
- Doklady Akad. Nauk S.S.S.R., Journal Name: Doklady Akad. Nauk S.S.S.R. Vol. Vol: 127
- Country of Publication:
- Country unknown/Code not available
- Language:
- Russian
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