Sanidine

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Sanidine

Sanidine is the high temperature form of potassium feldspar

Feldspar

Feldspars are a group of rock-forming tectosilicate minerals which make up as much as 60% of the Earth's Crust .Feldspars crystallize from magma in both intrusive and extrusive igneous rocks, as veins, and are also present in many types of metamorphic rock....
(K,Na)(Si,Al)₄O₈. Sanidine most typically occurs in felsic

Felsic

Felsic is a term used in geology to refer to silicate minerals, magma, and rock which are enriched in the lighter elements such as silicon, oxygen, aluminium, sodium, and potassium....
volcanic rock

Volcanic rock

Volcanic rock is an igneous rock of Volcano origin.Texture Volcanic rocks are usually fine-grained or aphanitic to glassy in texture....
s such as obsidian

Obsidian

Obsidian is a naturally occurring glass formed as an extrusive igneous rock. It is produced when felsic lava extruded from a volcano cools without crystal growth....
, rhyolite

Rhyolite

This page is about a volcanic rock. For the ghost town see Rhyolite, Nevada, and for the satellite system, see Rhyolite/Aquacade.Rhyolite is an igneous rock, volcanic rock , of felsic composition ....
and trachyte

Trachyte

Trachyte is an igneous, volcanic rock with an aphanitic to porphyritic texture. The mineral assemblage consists of essential alkali feldspar; relatively minor plagioclase and quartz or a feldspathoid such as nepheline may also be present....
. Sanidine crystallizes in the monoclinic crystal system. Orthoclase

Orthoclase

Orthoclase is an important Silicate minerals mineral which forms igneous rocks. The name is from the Greek language for "straight fracture," because its two cleavage planes are at right angles to each other....
is a monoclinic polymorph

Polymorphism (materials science)

Polymorphism in materials science is the ability of a solid material to exist in more than one form or crystal structure. Polymorphism can potentially be found in any crystalline material including polymers, minerals, and metals, and is related to allotropy, which refers to chemical elements....
stable at lower temperatures. At yet lower temperatures, microcline

Microcline

Microcline is an important igneous rocks-forming Silicate minerals mineral. It is a potassium-rich alkali feldspar. Microcline typically contains minor amounts of sodium....
, a triclinic polymorph of potassium feldspar, is stable.

Due to the high temperature and rapid quenching, sanidine can contain more sodium in its structure than the two polymorphs that equilibrated at lower temperatures.

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Encyclopedia

Sanidine is the high temperature form of potassium feldspar

Feldspar

Felsic

Volcanic rock

Volcanic rock is an igneous rock of Volcano origin.Texture Volcanic rocks are usually fine-grained or aphanitic to glassy in texture....
s such as obsidian

Obsidian

Obsidian is a naturally occurring glass formed as an extrusive igneous rock. It is produced when felsic lava extruded from a volcano cools without crystal growth....
, rhyolite

Rhyolite

Trachyte

Orthoclase

Polymorphism (materials science)

Microcline

Albite

Albite is a plagioclase feldspar mineral. It is the sodium Endmember of the plagioclase solid solution series. As such it represents a plagioclase with less than 10% anorthite content....
constitute a solid solution

Solid solution

A solid solution is a solid-phase solution of one or more soluble in a solvent. Such a mixture is considered a solution rather than a Chemical compound when the crystal structure of the solvent remains unchanged by addition of the solutes, and when the mixture remains in a single wiktionary:Homogeneous phase ....
series with intermediate compositions termed anorthoclase

Anorthoclase

The mineral anorthoclase is a crystalline solid solution in the alkali feldspar series, in which the sodium-aluminium silicate member exists in larger proportion....
. Exsolution of an albite phase does occur; resulting cryptoperthite can best be observed in electron microprobe

Electron microprobe

An electron microprobe , also known as an electron probe microanalyser is an analytical tool used to non-destructively determine the chemical composition of small volumes of solid materials....
images.