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See simple twins.

Have a look at the argillaceous limestone (L350) in the 1A Reference Series.

Compare with isotropic.

Have a look at the granodiorite (L120) for anhedral quartz, biotite and plagioclase.

Have a look at the amygdaloidal basalt (L161) in the 1A Reference Series.

Have a look at the rhyolite glass (L113) in the 1A Reference Series.

Common alteration minerals include clays for plagioclase, serpentine for olivine, and chlorite for ferromagnesian minerals such as biotite.