Biotite (black mica) and muscovite (white mica) are both minerals that have perfect basal cleavage--one direction. It cleaves into thin sheets.
Feldspars (albite, oligoclase, andesine, labradorite, bytownite, anorthite) have good cleavage in two directions at nearly right angles, poor in a third direction.
cleavage
Feldspar is the most abundant mineral in the earth crust.
Mica.
quarts, feldspar and mica
Granite is composed of feldspar, quartz, biotite and muscovite mica. It has a high amount of silica. Granite is an igneous rock.
Cleavage refers to the tendency of a mineral to break along flat surfaces. Graphite and mica have the same type of cleavage, which is a perfect basal cleavage.
It has both cleavage and fracture.
feldspar
feldspar
granite is made up of the minerls feldspar and mica
Both feldspar and mica are silicates.
Mica has perfect basal cleavage.
Feldspar.
cleavage
Feldspar is the most abundant mineral in the earth crust.
Mica.
Orthoclase Feldspar.