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Manganian andalusite from Manbazar, Purulia District, West Bengal, India

Published online by Cambridge University Press:  05 July 2018

K. S. Acharyya ,
S. Mukherjee  and
Abhijit Basu
K. S. Acharyya
Affiliation:
Department of Geology, J. D. College, Calcutta-26, India
S. Mukherjee
Affiliation:
Department of Geology, University of Calcutta, Calcutta-19, India
Abhijit Basu
Affiliation:
Department of Geology, Indiana University, Bloomington, IN 47405, USA
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Abstract

Manganian andalusite occurs abundantly as porphyroblasts in manganiferous metasediments subjected to contact metamorphism under hornblende hornfels facies at the contact of a picrodolerite dyke near Manbazar, Purulia District, India. The Mn2O3 content of andalusite varies from 13.2% to 19.17%, corresponding to 14.8 and 21.14 mole per cent of ‘Mn2SiO5’ respectively. Based on the analysis showing maximum amount of Mn2O3 in andalusite, the mineral formula may be represented as follows:

Other minerals in the assemblage are muscovite, manganophyllite, spessartine, piemontite, quartz, braunite, hematite and rutile. The manganian andalusite is completely fresh and appears to have formed at the expense of spessartine, piemontite and braunite during contact metamorphism. The manganian andalusite probably formed at about 600°C at around 3 kbar pressure. This is another rare example of andalusite with very high Mn2O3 (and Fe2O3) as well as that of an occurrence of abundant manganian andalusite.

Keywords

andalusitemanganesemetasedimentsManbazarIndia
Type
Silicate Mineralogy
Information
Mineralogical Magazine , Volume 54 , Issue 374 , March 1990 , pp. 75 - 80
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1990

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