description Sanidine Overview
Sanidine is the high-temperature form of potassium feldspar, with a composition close to KAlSi3O8 and a monoclinic crystal structure. It is commonly found in potassium-rich volcanic rocks such as rhyolite and other rocks that crystallized or equilibrated at high temperature; its rapid cooling can preserve the disordered arrangement that distinguishes it from microcline and orthoclase. Clear, glassy sanidine crystals may be cut or displayed as mineral specimens, but the species is primarily important in igneous-rock studies.
help Sanidine FAQ
What is sanidine?
Sanidine is the high-temperature form of potassium feldspar. Its composition is close to KAlSi3O8, and it has a monoclinic crystal structure.
Where is sanidine found?
Sanidine commonly occurs in potassium-rich volcanic rocks such as rhyolite. It forms when the rock crystallizes or equilibrates at high temperature.
Is sanidine the same as orthoclase?
Sanidine and orthoclase are both potassium feldspars, but sanidine forms and remains stable at higher temperatures. Their crystal structures and formation conditions help distinguish them.
Can sanidine be used as a gemstone?
Transparent sanidine can be cut as a gemstone, although it is better known as a mineral in volcanic rocks. Its importance in geology comes from its high-temperature origin.
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