Because this leads to insupportable coherency strains, dislocations form in two directions at right angles on the surface of the albite lamellae.
2
If the albite layers are too thick this schiller appears whitish which is less attractive.
3
In the mica-schists of this group biotite or muscovite may be the principal mineral and often both are present in varying proportions; the mica has developed from the argillaceous matter of the original rock; in addition there is always quartz and sometimes felspar (albite or oligoclase).
4
Moonstone is a mix of layers of albite and orthoclase.