Pericline twinning is a type of crystal twinning which show fine parallel twin laminae typically found in the alkali feldspars microcline.
22.
Certain minerals are practically confined to deep-seated intrusive rocks, e . g ., microcline, muscovite, diallage.
23.
In the acid rocks the common feldspars are orthoclase, perthite, microcline, and oligoclase all having much silica and alkalis.
24.
The essential components of aplites are quartz and alkali feldspar ( the latter usually orthoclase or microperthite ), microcline and albite.
25.
The largest documented single crystals of microcline were found in Devils Hole Beryl Mine, Colorado, US and measured ~ 50x36x14 m.
26.
Other associated minerals include nepheline, titanian andradite, aegirine, microcline, sanidine, albite, calcite, fluorite, ankerite and baryte.
27.
Other minerals in this group include adularia, anorthoclase, buddingtonite, celsian, hyalophane, microcline, monalbite, orthoclase, and sanidine.
28.
Adularia is a low temperature form of either microcline or orthoclase originally reported from the low temperature hydrothermal deposits in the Adula Alps of Switzerland.
29.
Take the alkali feldspar minerals for example, whose end members are albite, NaAlSi 3 O 8 and microcline, KAlSi 3 O 8.
30.
Litchfieldite is composed of two varieties of feldspar ( mostly albite but also some microcline ), with nepheline, sodalite, cancrinite and calcite.
