Manganese-bearing silicate minerals from metamorphosed manganese formations of India III. tirodite /
Tirodite, the yellow manganiferous amphibole, described first by DUNN & ROY [1938] from metamorphosed manganese formations at Tirodi, Madhya Pradesh, India, has been studied in detail. Earlier workers related this mineral either to richterite or to cummingtonite. Determination of optical propert...
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| Format: | Article |
| Published: |
University of Szeged, Department of Mineralogy, Geochemistry and Petrology
Szeged
1974
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| Series: | Acta mineralogica-petrographica
21 No. 2 |
| Kulcsszavak: | Kőzettan, Ásványtan, Földtan |
| Subjects: | |
| Online Access: | http://acta.bibl.u-szeged.hu/24579 |
| Summary: | Tirodite, the yellow manganiferous amphibole, described first by DUNN & ROY [1938] from metamorphosed manganese formations at Tirodi, Madhya Pradesh, India, has been studied in detail. Earlier workers related this mineral either to richterite or to cummingtonite. Determination of optical properties, X-ray powder data and interpretation of chemical analyses of the mineral from different localities indicate that the composition of tirodite (MnO 2.84 to 13.83%) varies fairly widely within the complete chemical series between tremolite and richterite. The tirodites were found either in an alkali-rich environment in pegmatites which assimilated part of the manganese formation they cut across, or in manganese silicate rocks themselves that have been subjected to soda-metasomatism. |
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| Physical Description: | 269-273 |
| ISSN: | 0365-8066 |