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Krishna, K. V. G.
- Mineralogy and Geochemistry of Alkali Beryl from the Rare Metal Bearing Pegmatites of Marlagalla-Allapatna, Mandya District, Karnataka
Authors
1 Atomic Minerals Directorate for Exploration and Research, Begumpet, Hyderabad - 500 016, IN
2 Atomic Minerals Directorate for Exploration and Research, Nagarbhavi, Bangalore - 560072, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 54, No 6 (1999), Pagination: 599-608Abstract
White coloured alkali beryl from the pegmatites of Mariagalla-Allapatna in Mandya district, Karnataka contains distinctly higher alkali elements (Na, Li, Rb, Ca) and relatively low beryllium oxide (c. 11 % BeO) compared to normal beryl. Beryl occurs mostly between graphic intermediate zone and quartz core in the complexly zoned, spodumene-bearing Li-Cs-Ta (LCT) type pegmatites in this area. The average value (n = 7) for alkali beryl from this area are Na2O 1.26%, Li2O 0.6%, Cs2O, 0.74%, K2O 0.07 and Rb2O 0.08%. Cs content in some of the beryls are higher than Na and hence such beryls may be termed as a new Na-Li-Cs type X-ray powder diffraction data for the beryl (ao = 9.2765-9.339 Å, co = 9.2079-9.2487 Å) reveal differences in crystal structure with respect to normal beryls from Royalstone, Massachusetts, USA (ao = 9.215Å, co = 9.192Å) and compares well with the reported alkali beryl from Arizona, USA (ao = 9.30Å, co = 9.20Å) Their refractive index (Nω) ranges from 1.588 to 1.592 and the specific gravity varies from 2.74 to 2.79.Keywords
Economic Geology, Geochemistry, Mineralogy, Rare Metal Pegmatites, Beryl, Marlagalla, Karnataka.
- Occurrence of Spodumene in the Rare Metal-Bearing Pegmatites of Mariagalla-Allapatna Area, Mandya Dist., Karnataka
Authors
1 Atomic Minerals Division, Dept. of Atomic Energy, Begumpet, Hyderabad-500016, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 44, No 2 (1994), Pagination: 127-139Abstract
Spodumene bearing rare metal pegmatites are reported mostly from Karnataka in contrast to lepidolite and amblygonite bearing pegmatites described from major mica-fields of India. Tantalite (Ta2O5 50-70%) rich pegmatites intruding the Sargur metasediments of Nagamangala schist belt near Marlagalla- Allapatna are also rich in spodumene (10-15% by vol.) as well as beryl (10.6-11.4% BeO). Light green spodumene (Li2O 6.55-7.35%) occurs randomly as prismatic crystals a few cm to 30 cm in length. Under the microscope, symplectic intergrowth between spodumene and quartz along the contact with albite and replacement of spodumene by quartz and muscovite are noticed. The 'd' spacings and intensities obtained from the X-ray diffraction patterns match well with the published values for Alphaspodumene from Pala San Diego County, California, U.S.A. Some variations observed in the intensities ofinterplanar spacings could be due to preferred orientations exhibited by the mineral. When heated to 1000° C for 3 hours, the Alpha-spodumene transformed to Beta- spodumene.
Chemically these spodumenes are "high iron non-chromian" types (FeO+Fe2O3 1.17 to 1.29%, Cr47- 87 ppm). While Mn content is high (1237-1826 ppm), other trace elements such as V, Cu, Co, Pb and Be are less than 10 ppm, Cs 39-98 ppm and Sn 19-28 ppm. Sn values are considerably low as compared to specimens reported from elsewhere, possibly because these pagmatites are devoid of cassiterite. Mineralogical assemeblage ofspodumene-tnntalite-pollucite in these pegmatites places them in "LCT (Lithium-Caesium-Tantalum) family" of rare element pegmatites as per classification of Cerny. Petromineralogical and geochronological studies of Allapatna granites have been undertaken which will throw furthur light on the geochemistry and paragenesis of these pagmatites. Few hundred tonnes of spodumene are expected to be recovered commercially from shallow depths alone along with tantalites and beryl.
Keywords
Spodumene, Symplectic Texture, Pegmatites, Petrology, Kamataka.- Mega Crystals of Uraninite and Euxenite in the Mica Pegmatite Mine-Dumps near Talupuru, Nellore District, Andhra Pradesh
Authors
1 Atomic Minerals Directorate for Exploration & Research, 1-10-153, Begumpet, Hyderabad 500 016, IN
Source
Current Science, Vol 109, No 8 (2015), Pagination: 1397-1399Abstract
No Abstract.Full Text
- A New Occurrence of Tapiolite from Kuberpur Pegmatite, Surajpur District, Chhattisgarh, India
Authors
1 Atomic Minerals Directorate for Exploration and Research, Nagpur 440 001, IN
2 Atomic Minerals Directorate for Exploration and Research, Hyderabad 500 016, IN
Source
Current Science, Vol 110, No 9 (2016), Pagination: 1620-1623Abstract
Survey and exploration for atomic minerals have been carried out in the past couple of decades by the Atomic Minerals Directorate for Exploration and Research (AMD) in parts of migmatitic terrain of erstwhile Sarguja district, Chhattisgarh and Sonbhadra district, Uttar Pradesh (UP), India.Full Text