potassium feldspar


Also found in: Dictionary, Thesaurus, Wikipedia.

potassium feldspar

[pə′tas·ē·əm ′fel‚spär]
(mineralogy)
Any alkali feldspar (orthoclase, microcline, sonidine, adularia) containing the molecule KAlSi3O8. Incorrectly known as K feldspar; potash feldspar.
References in periodicals archive ?
The chemical compositions of the Jinjiang and Julong hot springs are mainly controlled by mineral hydrolysis of albite, potassium feldspar, calcium feldspar, and pyroxene.
Unlike at Petit Anse, however, at Alderney Point the unconformity is between arkosic sandstone of the upper part of the Glenkeen Formation, overlain by angular boulder conglomerate of the Horton Group containing abundant clasts of the Glenkeen sandstone, both containing potassium feldspar. This locality is the only one known on Isle Madame where basal Horton Group contains debris of the basement on which it rests.
The sandstone is composed dominantly of sub-angular to semioval monomineral quartz grains, with less frequent grains of quartzite, granitic rocks, and kaolinite potassium feldspars. Clastic muscovite flakes are very rare.
In the case of feldspathites (volcanogenic interbeds consisting mostly of authigenic potassium feldspar), it is impossible to achieve the concentration of magmatic phenocrysts sufficient for detailed study.
Midtbo, "Simulation of potassium feldspar dissolution and illitization in the Statfjord Formation, North Sea," AAPG Bulletin, vol.
Feldspar growing as lamellar grains 0.1 to 1 mm in size corresponds to oligoclase, potassium feldspar occurs sporadically.
The sample is a red to pink felsic tuff that is characteristic of the unit, and is composed of about 15% 1 to 2 mm-size clear quartz and minor potassium feldspar and plagioclase crystals in a completely recrystallized quartzo-feldspathic matrix.
This met the requirements of the ceramics industry and extended the reserves of high potassium feldspar ore available to the Monticello facility.
Pink potassium feldspar, gray to milky quartz, biotite, hematite, magnetite and secondary iron oxides characterize the western portion.
Varying colours and surface textures were obtained by using the glass waste originated in Eskisehir, instead of ulexite, sodium feldspar and potassium feldspar (by using glass waste in equivalent amounts of the prescribed quantities of raw materials) in the alkaline and boron added standard stoneware glazes.
PERCENTAGE) Raw material Si[O.sub.2] [Al.sub.2][O.sub.3] Sodium feldspar 68.87 17.46 Potassium feldspar 67.06 17.15 Ulexite 2.87 - Kaolin 69.12 18.98 Quartz 99.50 - Raw material [Fe.sub.2][O.sub.3] CaO MgO [Na.sub.2]O Sodium feldspar 0.06 0.58 0.03 12.08 Potassium feldspar 0.16 0.14 - 2.64 Ulexite 0.20 15.45 1.54 6.48 Kaolin 0.80 1.30 1.51 0.25 Quartz - - - - Raw material [K.sub.2]O Ti[O.sub.2] [B.sub.2][O.sub.3] Sodium feldspar 0.25 0.27 - Potassium feldspar 12.65 - - Ulexite 0.18 0.04 38.67 Kaolin 2.93 0.80 Quartz - 0.07 - Raw material * L.O.I Sodium feldspar 0.40 Potassium feldspar 0.20 Ulexite 34.57 Kaolin 4.31 Quartz 0.43 * L.O.I: Losses on Ignition.

Full browser ?