Examples of biotite

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The kinematic evidence is interpreted to mean that the contact between the gneiss and the biotite schist has a normal-shear (hangingwall down) geometry.
Green or red biotite is common and may be included in feldspar.
Green and red biotite is common as phenocrysts, microphenocrysts and groundmass.
Sample 5152 collected eight kilometres east of this contact is a biotite- and hornblende-bearing granodiorite.
Virtually unaltered amphibolites may have subordinate, late, randomly oriented biotite laths overgrowing the main foliation.
It is associated with biotite and with sparse, small crystals of epidote.
There are only a few grains of biotite present in the studied rock with textures indicating retrograde origin.
Primary hornblende is commonly partially replaced by fine decussate biotite indicative of some static recrystallization, although plagioclase retains igneous zoning.
Here, the igneous and corona textures are obliterated by the growth of amphibolite-facies assemblages with hornblende, plagioclase, biotite, garnet and zoisite.
This is conspicuous for biotite and amphibole crystals but less so in the strongly altered feldspar crystals.
In weakly deformed gneiss, the mafic minerals (biotite, augite and hornblende) occur as irregular clusters, locally separated from plagioclase by coronas of garnet.
Biotite-bearing schlieric migmatites such as sample no. 452640 are interlayered on a 20 to 100 m scale with garnet-bearing deformed augen granites.
It is composed of biotite and amphibole granodiorites, with slightly deformed biotites and locally weakly altered to chlorite.
Accessory minerals include secondary phengite after feldspar and biotite, rutile needles in biotite, red garnet, monazite, heavily altered, orthite, epidote after biotite, and zircon.

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