Nambulite, (Li,Na)Mn4Si5O14(OH), in the Sausar Group of rocks in Central India
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Accession number;05A0260883
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| Title;Nambulite, (Li,Na)Mn4Si5O14(OH), in the Sausar Group of rocks in Central India |
| Author;
MUKHOPADHYAY S
(Jadavpur Univ., Kolkata, Ind)
DAS K
(Presidency Coll., Kolkata, Ind)
FUKUOKA M
(Hiroshima Univ., Higashi-hiroshima, Jpn)
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Journal Title;J Mineral Petrol Sci
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Journal Code:G0150B
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ISSN:1345-6296
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VOL.100;NO.1;PAGE.26-30(2005)
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| Figure&Table&Reference;FIG.4, TBL.2, REF.8 |
| Pub. Country;Japan |
| Language;English |
| Abstract;Manganese carbonate-silicate rocks in the Sausar Group, India are often traversed by pegmatite veins. Nambulite, a lithium- and sodium-bearing hydrous manganosilicate, is formed by the reaction of a hydrothermal solution with the host mineral, rhodonite. Despite the similarity of natronambulite and nambulite, the chemical composition shows a variation in the concentration of Na+ in the empirical formula: (Li0.94-0.60Na0.06-0.40).SIGMA.1.00(Mn3.57-3.82Ca0.13-0.07Mg0.36-0.07Fe0.03-0.01).SIGMA.3.96-3.86Si5.01-4.98O14(OH)1.00.This is the first report of the sodium-rich variety from India. Powder X-ray diffraction studies reveal the unit cell parameters of nambulite in the triclinic system as a=7.55.+-.0.06.ANGS., b=11.77.+-.0.07.ANGS., c=6.68.+-.0.04.ANGS., .ALPHA.=91.3.DEG..+-.0.8.DEG., .BETA.=95.4.DEG..+-.0.5.DEG.,.GAMMA.=107.2.DEG..+-.0.7.DEG. and V=563.+-.6.ANGS.3. (author abst.) |
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