Sericite Alteration Thin Section

In general the three massive felsic volcanic rocks flows are more intensely altered than the younger granite. Sericite is name given to very fine ragged grains and aggregates of white mica usually muscovite produced by the alteration of feldspars or other minerals. Sericite grains are too small to see in hand specimens and it is transparent with only moderate relief when viewed in thin section in plane polarised light.

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