The New Encyclopaedia Britannica, Volume 9 |
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Page 137
... mineral similar to mus- covite , a basic silicate of sodium and alu- minum ; a member of the common mica group . It was thought to be an uncommon mineral , but experiment and investigation have shown that it is widespread in metamorphic ...
... mineral similar to mus- covite , a basic silicate of sodium and alu- minum ; a member of the common mica group . It was thought to be an uncommon mineral , but experiment and investigation have shown that it is widespread in metamorphic ...
Page 518
... mineral , these colour centres are pro- duced most intensely around the inclusion . Pleochroic halos are commonly found in rock- forming minerals - for example , biotites , flu- orites , and amphiboles . The most common inclusions are ...
... mineral , these colour centres are pro- duced most intensely around the inclusion . Pleochroic halos are commonly found in rock- forming minerals - for example , biotites , flu- orites , and amphiboles . The most common inclusions are ...
Page 826
... mineral , manganese dioxide ( MnO2 ) , that constitutes an important ore . Always formed under highly oxidizing conditions , it forms light - gray to black , metallic , moderately heavy coatings , crusts , or fibres that are alteration ...
... mineral , manganese dioxide ( MnO2 ) , that constitutes an important ore . Always formed under highly oxidizing conditions , it forms light - gray to black , metallic , moderately heavy coatings , crusts , or fibres that are alteration ...
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