Potassium feldspar refers to a number of minerals in the feldspar group, and containing potassium:
Orthoclase (endmember formula KAlSi3O8), an important tectosilicate mineral that forms igneous rock
Microcline, chemically the same as orthoclase, but with a different crystalline structure
Sanidine, the high-temperature form of potassium feldspar (K,Na)(Si,Al)4O8
Adularia, a more ordered low-temperature variety of orthoclase or partially disordered microcline
Amazonite (sometimes called "Amazon stone"), a green variety of microcline
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Potassiumfeldspar refers to a number of minerals in the feldspar group, and containing potassium: Orthoclase (endmember formula KAlSi3O8), an important...
calcium, potassium, or barium. The most common members of the feldspar group are the plagioclase (sodium-calcium) feldspars and the alkali (potassium-sodium)...
gap between anorthite and potassiumfeldspar, (KAlSi3O8), the third common rock-forming feldspar end member. Potassiumfeldspar does form a solid solution...
Alkali feldspar granite, some varieties of which are called 'red granite', is a felsic igneous rock and a type of granite rich in the mineral potassium feldspar...
planes are at right angles to each other. It is a type of potassiumfeldspar, also known as K-feldspar. The gem known as moonstone (see below) is largely composed...
important igneous rock-forming tectosilicate mineral. It is a potassium-rich alkali feldspar. Microcline typically contains minor amounts of sodium. It is...
used to describe an intergrowth of two feldspars: a host grain of potassium-rich alkali feldspar (near K-feldspar, KAlSi3O8, in composition) includes exsolved...
is absorbed by mineral grains in the sediments such as quartz and potassiumfeldspar. The radiation causes charge to remain within the grains in structurally...
as amazonstone, is a green tectosilicate mineral, a variety of the potassiumfeldspar called microcline. Its chemical formula is KAlSi3O8, which is polymorphic...
form feldspars. Most granites have a composition such that almost all their aluminum and alkali metals (sodium and potassium) are combined as feldspar. This...
Sanidine is the high temperature form of potassiumfeldspar with a general formula K(AlSi3O8). Sanidine is found most typically in felsic volcanic rocks...
sometimes greater than 1 meter (3 ft). Most pegmatites are composed of quartz, feldspar, and mica, having a similar silicic composition to granite. However, rarer...
reacts with oxygen. Orthoclase (potassiumfeldspar) is a common rock-forming mineral. Granite for example contains 5% potassium, which is well above the average...
with phaneritic texture. Feldspar is present as plagioclase (typically oligoclase or andesine) with 10% or less potassiumfeldspar. Quartz is present at...
quartz-plagioclase intergrowths are associated with and commonly in contact with potassiumfeldspar. Myrmekite is formed under metasomatic conditions, usually in conjunction...
within the Earth. Granite is a felsic rock, meaning it is rich in potassiumfeldspar and quartz. This composition is continental in origin (meaning it...
company which was set up to market and sell the gemstones. Specimens of potassiumfeldspar that display a phenomenon remarkably similar to Rainbow lattice sunstone...
source of green or blue light (for quartz) or infrared light (for potassiumfeldspar). Ultraviolet light emitted by the sample is detected for measurement...
In granitic pegmatites, beryl is found in association with quartz, potassiumfeldspar, albite, muscovite, biotite, and tourmaline. Beryl is sometimes found...
a large amount of sodium (Na) and calcium (Ca) rich plagioclase, potassiumfeldspar, quartz, and minor amounts of muscovite mica as the lighter colored...
1 to several percent. It can be found in igneous rocks containing potassiumfeldspar and plagioclase. Baddeleyite is commonly not found with zircon (ZrSiO4)...
resembling quartz monzonite or granite, by altering plagioclase to potassiumfeldspar and emplacing hydrothermal quartz. Fragments of monzonite have been...
deposition as kaolinite can form from feldspars in tropical soils by leaching of potassium; and low potassium readings may thus indicate the presence...
with alternating microscopic bands of sodium feldspar (albite) and potassiumfeldspar (sanidine). Trachytes are typically fine-grained and light-colored...
phase transitions and the transition from aluminum silicate plus potassiumfeldspar to muscovite plus quartz. Whereas a petrogenetic grid shows phases...
However, most of the fossils are too small for the human eye to detect. Potassium-feldspar (K-spar) crystals embedded within the Sandia granite give the mountains...
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