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Topic: Potassium feldspar

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	[No title]
		Potassium chloride is used as a substitute for table salt and is also used to stop the heart, e.g.
		Potassium salts such as carnallite, langbeinite, polyhalite, and sylvite are found in ancient lake and sea beds.
		Potassium is an essential mineral micronutrient in human nutrition; it assists in muscle contraction and in maintaining fluid and electrolyte balance in body cells.
	www.potassium.com (1117 words)

	Feldspar
		Feldspar is a name given to a class of aluminum-containing silicates which form with no cleavage planes.
		This feldspar is distinguished from the orthoclase form by its content of calcium and sodium.
		This feldspar is distinguished from the plagioclase form by its content of potassium.
	hyperphysics.phy-astr.gsu.edu /hbase/geophys/feldspar.html (481 words)

	Petrography and Lithology Part Two
		Potassic alteration is typified by potassium feldspar and/or hydrothermal biotite.
		Potassium feldspar is a common mineral component in thin-sections of porphyritic and phaneritic texture.
		Crystals of plagioclase feldspar with mantles of potassium feldspar are common in the least altered samples of phaneritic rock (Figures 26G and H).
	www.fortunecity.co.uk /safaripark/lamprey/108/pnlith2.htm (4161 words)

	Feldspar Mineral,Potassium Feldspar,Feldspar Information,Feldspar Uses
		Feldspar is used as bonding agent along with magnesium oxide, magnesium chloride and other synthetic glue in the manufacture of abrasives, wheels, discs and other shapes.
		Feldspar is of widespread occurrence and is mined in almost all countries.
		Feldspar is used in varying proportions in porcelain, china and earthenware.
	mineralszone.com /minerals/feldspar.html (1276 words)

	Feldspar: World of Earth Science
		The term feldspar actually covers a whole family of minerals, all of which consist of a framework of aluminum, oxygen, and silicon atoms plus an additive, usually potassium, sodium, or calcium.
		Feldspars containing significant quantities of both calcium and potassium are not found, as such mixtures are not chemically stable in cooling magma and react to form other minerals.
		Feldspar is less chemically stable when exposed to water than quartz, the other major ingredient of granite.
	science.enotes.com /earth-science/feldspar (333 words)

	Orthoclase, rock, crystal, mineral, gem stone, birth stones - mineralgallery
		Feldspars are used in the manufacture of ceramics and ceramic glazes and as mild abrasives.
		Feldspars are also major constituents of moon rocks, which are similar to rocks of the Earth's crust.
		The high-temperature potassium feldspars, sanidine and orthoclase, are monoclinic in their crystal symmetry; the others are triclinic, although they retain the general atomic pattern of the monoclinic species.
	www.mineralgallery.co.za /orthoclase.htm (682 words)

	UCCE Tulare County,
		Potassium is an alkali metal and is located in a group (column) of elements on the far left side of the periodic table of elements.
		Potassium salts (potassium chloride, potassium sulfate, etc.) are soluble because of the low electronegativity of K. As a result, with the weathering of rocks and soil, potassium eventually is released from crystalline minerals and, once in solution, moves to the oceans.
		Potassium available for plant uptake is found in the soil solution and on the cation exchange of clay minerals and organic matter and represents a very small fraction of the total K in soils.
	cetulare.ucdavis.edu /pubgrape/ng999.htm (2186 words)

	PIRSA Minerals - Mineral Resource Potential - Feldspar (Site not responding. Last check: 2007-10-21)
		Feldspars are aluminosilicate minerals with varying amounts of potassium, sodium and calcium in a solid solution series.
		Most commercial varieties are alkali feldspars, with composition between sodium and potassium end members, or at the sodic end of the plagioclase (sodium—calcium) group.
		From 1986 to 1989, 14 800 t of feldspar were mined from a partly kaolinised quartz—feldspar—muscovite pegmatite near the western margin of the Mount Crawford kaolinite—sillimanite orebody during a phase of quarry expansion.
	www.pir.sa.gov.au /pages/minerals/commodity/feldspar.htm (462 words)

	THE FELDSPAR GROUP OF MINERALS
		The feldspars are a group of minerals that have similar characteristics due to a similar structure.
		The plagioclase feldspars are a set of minerals that are in a series from a sodium rich end member, albite, to a potassium rich end member, anorthite.
		Once identified, however, some feldspar mineral varieties are found to have distinctive characteristics or originate from a classic locality and on these bases are recognized by mineral collectors as belonging to a specific feldspar mineral.
	mineral.galleries.com /minerals/silicate/feldspar.htm (454 words)

	PETROGRAPHIC DESCRIPTIONS
		Grains of plagioclase, potassium feldspar, and mica flakes (biotite, muscovite, and chlorite) are also common monomineralic components.
		Feldspar grains are typically fresh and consist predominantly of plagioclase, with lesser potassium feldspar.
		Grains of plagioclase are common, whereas polycrystalline quartz, potassium feldspar, coarse carbonate, zeolite, biotite, and muscovite are minor constituents.
	www-odp.tamu.edu /publications/161_SR/chap_03/c3_4.htm (1402 words)

	Awards and Recognition: Feldspar and Nepheline Syenite: Fillers With a Purpose
		Feldspars are commonly differentiated according to the dominant alkali.
		The balance of the feldspar and nepheline syenite is used as fillers in coatings, plastic and rubber.
		Feldspar and nepheline syenite are unique among low-aspect-ratio fillers for the combination of physical and optical properties that they provide for coatings, as summarized in Table 4.
	www.rtvanderbilt.com /awards_3.htm (1087 words)

	The Element Potassium -- Potassium Atom
		sodium and potassium is used as a heat-transfer medium.
		Potassium chloride is used as a substitute for
		Minerals are dated by measurement of the concentration of potassium, and the amount of radiogenic Ar-40 that has accumulated.
	www.worldofmolecules.com /elements/potassium.htm (459 words)

	Feldspar Structure
		Below is a view of feldspar in the (010) plane, along the b-axis, with the a- and c-axis directions shown.
		The feldspars have cleavage along (001), that is, the vertical plane between the chains, and (010), the mirror planes between the double layers.
		The radii of the principal feldspar cations in Angstrom units are: K 1.6; Ba 1.5; Na 1.4 and Ca 1.25.
	www.uwgb.edu /dutchs/PETROLGY/FeldsparStruct.HTM (1033 words)

	MP2 Research: Pegmatite-Aplite Dike
		Graphic intergrowth of potassium feldspar and quartz are present in all San Diego County pegmatite-aplite dikes, principally in the hanging wall.
		Tapered crystals of potassium feldspar are oriented perpendicular to the layers and enlarge toward the center of the dike.
		These potassium feldspar crystals form graphic intergrowths with quartz, in the upper portions of the hanging wall, but form separate phases as the core zone is approached in both the George Ashley and Himalaya dikes.
	www.uno.edu /pegmatology/pub/aplite/aplite4.html (3398 words)

	Mineral Information Institute - FELDSPAR
		Feldspar: A rock-forming mineral, industrially important in glass and ceramic industries, pottery and enamelware, soaps, abrasives, bond for abrasive wheels, cements and concretes, insulating compositions, fertilizer, poultry grit, tarred roofing materials, and as a sizing (or filler) in textiles and paper.
		Feldspar is mined from large granite bodies (called plutons by geologists), from pegmatites (formed when the last fluid stages of a crystallizing granite becomes concentrated in small liquid and vapor-rich pockets that allow the growth of extremely large crystals), and from sands composed mostly of feldspar.
		Because feldspar is such a large component of the Earth’s crust, it is assumed that the supply of feldspar is more than adequate to meet demand for a very long time to come.
	www.mii.org /Minerals/photofelds.html (532 words)

	Granite
		Granite is a coarse or medium-grained intrusive igneous rock that is rich in quartz and feldspar (k-feldspar and plagioclase); it is the most common plutonic rock of the Earth's crust, forming by the cooling of magma (silicate melt) at depth.
		Both plagioclase feldspar and potassium feldspar are usually abundant in it, and their relative abundance has provided the basis for granite classifications.
		Granites in which plagioclase greatly exceeds potassium feldspar are common in large regions of the western United States and are thought to be characteristic of the great series of batholiths stretching from Alaska and British Columbia southward through Idaho and California into Mexico.
	geology.csupomona.edu /alert/igneous/granite.htm (479 words)

	Description of the Different Rock Types Used as Building Material (Site not responding. Last check: 2007-10-21)
		The potassium feldspars are the large crystals ("phenocrysts") set in an otherwise equi-granular matrix.
		The main minerals evident in the rock are potassium feldspar, plagioclase feldspar, quartz, sericite, biotite, and muscovite.
		The main minerals evident in the rock are quartz, potassium feldspar (microcline), plagioclase feldspar, and biotite.
	www.uwm.edu /Dept/Geosciences/Urban_Geology/rockdescription.html (1669 words)

	Potassium - Wikipedia, the free encyclopedia
		Potassium must be protected from air for storage to prevent disintegration of the metal from oxide and hydroxide corrosion.
		Potassium was discovered in 1807 by Sir Humphry Davy, who derived it from caustic potash (KOH).
		Foods with high sources of potassium include orange juice, potatoes, bananas, avocados, apricots, parsnips and turnips, although many other fruits, vegetables, and meats contain potassium.
	en.wikipedia.org /wiki/Potassium (1620 words)

	USGS Geology in the Parks
		Feldspar crystals are stubby prisms, generally white to gray and a glassy luster.
		Potassium feldspar is another member of the feldspar mineral family.
		Like plagioclase feldspar, potassium feldspars are silicate minerals that contain a considerable amount of -you guessed it- potassium.
	wrgis.wr.usgs.gov /docs/parks/rxmin/mineral.html (338 words)

	Clay minerals & fertilizer management -DAWN - Business; April 24, 2006
		Kaolinite and chlorite clay minerals: These minerals don’t contain potassium and have low nutrient retention capacity; their importance as sources of potassium nutrient for plants, and their interaction in soil solution with other nutrients like ammonium, calcium etc., are negligible.
		The potassium contents of mica in sand, silt and clay fractions are 70 per cent, 93 per cent, and 97 per cent, respectively.
		As mica releases potassium ions to the soil solution during the processes of weathering, and if weathering has proceeded enough it is transformed to expandable illite (hydrous mica) after interlayer entry of water molecules.
	www.dawn.com /2006/04/24/ebr5.htm (1285 words)

	Feldspar
		Feldspar is a group of abundant rock-forming minerals with the general formula MAl(Al, Si)3O8, where M can be K, Na, Ca, Ba, Rb, Sr, or Fe.
		Feldspars are aluminum silicates combined with varying percentages of potassium, sodium, and calcium.
		Feldspars are commonly associated with quartz and mica and may also contain spodumene (lithium aluminosilicate), kaolin, garnet, or iron bearing minerals.
	www.arrmaz.com /industrialminerals-feldspar.htm (286 words)

	What rocks can tell us - Igneous
		Most granites are composed of potassium feldspar, quartz, sodium-rich plagioclase feldspar, and one or a combination of the following: biotite mica, muscovite mica, and hornblende.
		Some examples are quartz, the micas, potassium feldspars, and a host ore-bearing elements like gold, silver, lithium, and fluorine (web site on crystallization?).
		The feldspar is, in turn, intruded by quartz veins in some areas, by diabase in other areas, and by biotite-feldspar pegmatite veins in still other areas (Figure 15).
	www.mohave.edu /pages/576.asp (1297 words)

	The Minerals of Igneous Rocks
		Some potassium feldspar is white like plagioclase, but is usually a safe bet to identify any frosty white grains in igneous rocks as plagioclase.
		Orthoclase: the slightly pinkish grains are the potassium feldspar, orthoclase.
		Unfortunately, all potassium feldspar is not pink, microcline is usually white.
	geology.csupomona.edu /alert/igneous/igmin.htm (1142 words)

	Feldspar spectra
		Blue color in the amazonite variety of potassium feldspar (and pale-blue albite as well) is from the interaction of trace amounts of Pb in the feldspar with ionizing radiation (again, the radiation usually comes from the decay of potassium-40).
		Feldspars with intermediate ordering often show both a green and a blue component in the spectrum.
		There are also rare varieties of plagioclase feldspar colored green and red from copper ions and colloidal copper.
	minerals.gps.caltech.edu /FILES/Visible/feldspar/index.htm (462 words)

	[No title]
		Sketch of the crystals of plagioclase feldspar shown in A. Euhedral crystal of potassium feldspar in an andesine-potassium feldspar phanerite.
		These inclusions are aligned along growth zones within the crystal of potassium feldspar or they may represent unreplaced portions of a partly replaced feldspar of metasomatic origin.
		It is enclosed by interstitial potassium feldspar on three sides and is in contact with an elongate section of plagioclase on the forth.
	www.fortunecity.co.uk /safaripark/lamprey/108/fig026.htm (361 words)

	Feldspar
		At the same time in Russia each year the new capacities on manufacturing ceramic tile - porcelainized stoneware not supported with raw base on feldspar are started.
		Existing lack in feldspar the raw material is possible to fill at the expense of organization of manufacture quartz-feldspar of raw material.
		The quartz-feldspar material, received by dry enrichment from Malyshevo of "tails", was tested in laboratories "FERRO" (Spain), where on him(it) the positive responses were received by manufacture of a ceramic granite.
	www.feldspar-ru.com (522 words)

	potassiumfeldspar.htm
		DODGE COUNTY: Potassium feldspar, largely altered to clay minerals occurs in pegamtites cutting quartzite in the Michal Materials Quarry, sec.
		ROCK COUNTY: Euhedral authigenic monoclinic K feldspar is found in the St. Peter Formation in the Silica Sand quarry near Hanover (Odom, Willard and Lassin, 1979).
		SAUK COUNTY: K feldspar is a common constituent of the Baxter Hollow Granite near Sampler in SW sec.
	www.uwrf.edu /~wc01/potassiumfeldspar.htm (1998 words)

	FELDSPAR STAINING OF THE PLUTONIC ROCKS OF THE SALINIAN TERRANE
		An estimate of the relative percentages of K-feldspar compared to the percentage of plagioclase feldspar in the rock is vital.
		When the potassium feldspar is dominant and quartz is significant the rock might be identified as granite, but if potassium feldspar and plagioclase feldspar were nearly equal then the rock should properly be referred to as Quartz Monzonite.
		The members of the series between Or and Ab are known as the alkali feldspars and the members in the series between Ab and An as the plagioclase feldspars.
	www.marin.cc.ca.us /~jim/geolprojects (2227 words)

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