Damage produced during thin section grinding causes speckles of light in the biotite where the crystal lattice has been deformed.
Marble thin section minerals.
Rock forming minerals of metamorphic rocks in thin section a work in progress 1 olivine.
If a mineral commonly has a range of colours it will appear once for each colour.
Geol209 intensive school day 2 lecture 2 properties of minerals in thin section follow une geoscience on facebook.
Castner marble from the franklin mountains in southwest texas castner marble featuring garnet porphyroblasts marble in thin section hellip.
Microstructure and grain size measurements on thin sections of this marble identify two petrographic varieties.
Within the tables minerals are arranged by colour so as to help with identification.
The first is extremely fine with signs of dynamic recrystallization and the second exhibits texture and mgs similar to those of carrara marble.
Plane polarised light width of view 2 5 mm.
This means that biotite in standard thin sections rarely goes completely extinct.
Identification tables for common minerals in thin section these tables provide a concise summary of the properties of a range of common minerals.
Biotite metaluminous granite showing a close up of one crystal.