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	ORTHOCLASE (Potasium Aluminum Silicate)
		Orthoclase is a polymorph of other minerals that share the same chemistry, but have different crystal structures.
		Orthoclase does not show the lamellar twinning that is common in microcline and is occassionally present as striations on cleavage surfaces.
		Between approximately 500 degrees C and 900 degrees C, orthoclase is the stable structure.
	mineral.galleries.com /minerals/silicate/orthocla/orthocla.htm (560 words)

	Kids.Net.Au - Encyclopedia > Orthoclase
		This group of minerals consists of three silicates: a potassium-aluminium silicate (the orthoclase feldspars), a sodium-aluminium silicate, and a calcium-aluminium silicate (the plagioclase feldspars) and their isomorphous mixtures.
		Orthoclase is a common constituent of many igneous rocks and is often found in huge masses in pegmatite veins.
		Orthoclase is used in the manufacture of porcelain and as a constituent of scouring powder.
	www.kids.net.au /encyclopedia-wiki/or/Orthoclase (647 words)

	Orthoclase
		Orthoclase is named based on the Greek for "straight fracture," because its two cleavages are at right angles to each other.
		Orthoclase is a common constituent of most granites and other felsic igneous rocks and is often found in huge crystals and masses in pegmatite veins.
		A glassy kind of orthoclase, called sanidine, is typical of felsic volcanic rocks and is found in the trachytes of the Drachenfels, Germany.
	www.marble.com /countertops/encyclopedia/46/orthoclase.html (236 words)

	Felspar - LoveToKnow 1911
		In England the material employed is mostly orthoclase from Scandinavia, often known as " Swedish spar." The high translucency of " ivory porcelain " depends on the large proportion of felspar in the body.
		Among the applications of felspar is that of pure orthoclase in the manufacture of artificial teeth.
		The turbidity of orthoclase is usually due to partial kaolinization.
	www.1911encyclopedia.org /Felspar (612 words)

	Feldspar
		Note that the plagioclase differs from the orthoclase in terms of the additional metals, plagioclase having calcium or sodium and orthoclase having potassium.
		This feldspar is distinguished from the orthoclase form by its content of calcium and sodium.
		Polycrystalline orthoclase is usually light cream to salmon pink in color, although color is not a reliable indicator of mineral type.
	hyperphysics.phy-astr.gsu.edu /hbase/geophys/feldspar.html (481 words)

	Feldspar : Orthoclase
		This group of minerals consists of three silicates: a potassium-aluminium silicate (the orthoclase feldspars), a sodium-aluminium silicate, and a calcium-aluminium silicate (the plagioclase feldspars) and their isomorphous mixtures.
		Orthoclase is a common constituent of many igneous rocks and is often found in huge masses in pegmatite veins.
		A glassy kind of orthoclase, called sanidine[?], is found in the trachytes[?] of the Drachenfels[?], Germany.
	www.findword.org /or/orthoclase.html (909 words)

	Orthoclase (Site not responding. Last check: 2007-10-31)
		Orthoclase is a member of the feldspar mineral group.
		The orthoclase is also found in a yellow variety that is often confused with a gem-quality plagioclase feldspar known as labradorite.
		Thus, the yellow orthoclase would appear to be larger than the labradorite when comparing identical cuts and carat weights.
	www.dandennis.com /orthoclase.htm (215 words)

	ORTHOCLASE (Potasium Aluminum Silicate)
		Orthoclase is a polymorph of other minerals that share the same chemistry, but have different crystal structures.
		Orthoclase does not show the lamellar twinning that is common in microcline and is occassionally present as striations on cleavage surfaces.
		Orthoclase forms at intermediate temperatures between the stability fields of sanidine and microcline.
	www.galleries.com /minerals/silicate/orthocla/orthocla.htm (560 words)

	Orthoclase: Orthoclase mineral information and data.
		Foland, K.A. (1974) 40Ar diffusion in homogeneous orthoclase and an interpretation of Ar diffusion in K-feldspar.
		Foland, K.A. and Xu, Y.-P. (1990) Diffusion of 40Ar and 39Ar in irradiated orthoclase.
		Villa, I.M. (1996) The influence of irradiation and heating schedule on Ar diffusion in gem-quality orthoclase from Madagascar.
	www.mindat.org /min-3026.html (638 words)

	Spartanburg SC \| GoUpstate.com \| Spartanburg Herald-Journal (Site not responding. Last check: 2007-10-31)
		Orthoclase is a common constituent of most granites and other felsic igneous rocks and is often found in huge crystals and masses in pegmatite masses.
		Typical orthoclase is a solid solution between the pure potassium endmember and the sodium endmember, albite (NaAlSi
		Together with the other potassium feldspars orthoclase is a common raw material for the manufacture of some glasses, some ceramics, such as porcelain, and as a constituent of scouring powder.
	www.goupstate.com /apps/pbcs.dll/section?category=NEWS&template=wiki&text=orthoclase (258 words)

	ORTHOCLASE - Online Information article about ORTHOCLASE
		Breithaupt in 1823, who was the first to distinguish orthoclase from the other felspars.
		Ireland.' As a mineral of secondary origin orthoclase is sometimes found in cavities in basaltic rocks, and its occurrence in metalliferous mineral-veins has been observed.
		epidote also result by the alteration of orthoclase.
	encyclopedia.jrank.org /ORC_PAI/ORTHOCLASE.html (1052 words)

	Orthoclase
		Orthoclase is a common alkali (or potassium) feldspar mineral that can be pink or white in colour.
		Orthoclase is a typical feldspar that is the dominant mineral in coarse-grained silica-rich igneous rocks like granite and syenite.
		In igneous rocks orthoclase is common and may sometimes, when white, be confused with Na-plagioclase.
	www.es.ucl.ac.uk /schools/Glossary/orthoclase.htm (83 words)

	The feldspar orthoclase
		Orthoclase is one of the most common minerals, and occurs in numerous mineral
		Orthoclase is industrially important in the manufacture of glass and ceramics.
		Orthoclase is one of the most common minerals, and is found worldwide.
	www.minerals.net /mineral/silicate/tecto/feldspar/orthocls.htm (407 words)

	Orthoclase Ingeous Rock Forming Mineral
		The clear, glassy, slightly gray minerals in this specimen is quartz.
		In felsic igneous rocks orthoclase is common and may sometimes, when white, be confused with Na plagioclase.
		Note that there is a fair amount of quartz in this specimen (the clear, glassy grains in the rock).
	csmres.jmu.edu /geollab/Fichter/RockMin/orthoqtz1.html (121 words)

	About Orthoclase
		A type of feldspar, orthoclase feldspar is a common mineral used in the glass and ceramic industries.
		The glassy variety of orthoclase known as sanidine, forms tabular crystals embedded in volcanic rock.
		The minerals moonstone and adularia are forms of orthoclase.
	www.legendweaver.com /metastore/cnd/item347.htm (98 words)

	MFA - CAMEO - Print Page
		Orthoclase is found in many igneous rocks worldwide.
		Orthoclase with an intergrowth of albite has a pearly opalescence and is called moonstone.
		Orthoclase has been used since ancient times for beads.
	www.mfa.org /_cameo/frontend/material_print.asp?name=orthoclase&type=description (92 words)

	MONOCLINIC ORTHOCLASE CRYSTALS HAVING AUGEN AND TRICLINIC SHAPES BY REARRANGEMENT OF GRANITIC MINERALS UNDER STRESS (Site not responding. Last check: 2007-10-31)
		Other triclinic shaped crystals have recognizable forms and are nearly euhedral, but are crooked to the eye, with angles between faces (001) and (010) of 91ø to 94ø (compared to 90.0ø for orthoclase and 90.5ø for microcline).
		Crooked orthoclase crystals were reported by Goldsmith and Laves from the Lincoln porphyry, near Leadville, Colorado.
		Orthoclase crystals in PF-type plutons tend to separate whole, and are simple combinations of monoclinic forms.
	gsa.confex.com /gsa/2002AM/finalprogram/abstract_38095.htm (418 words)

	Orthoclase, rock, crystal, mineral, gem stone, birth stones - mineralgallery
		A few varieties, including labradorite and orthoclase, are occasionally used as gems because they show an iridescent play of colors or a milky translucence.
		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.
		The compositional range of orthoclase extends only partway to albite, and orthoclase may occur with albite in rocks.
	www.mineralgallery.co.za /orthoclase.htm (682 words)

	Feldspar
		Orthoclase - usually light colored white, pink, yellow, or cream, and not transparent.
		Orthoclase got is name from the Greek phrase meaning "straight fracture", Microcline from a Greek phrase meaning "small incline", and Plagioclase from the Greek phrase meaning "oblique fracture".
		Orthoclase - when transparent it is faceted into a gemstone.
	www.theimage.com /gemstone/feldspar/feldspar.html (472 words)

	Orthoclase Texas
		The variation in abundance of the different types of crystals furnishes interesting data on the crystallization of orthoclase.
		It is believed that most of the irregularities in the result are due to impurities in the mineral which are apparent when the crystals are examined under the microscope, magnetite and an amphibole being present as inclusions in small amounts.
		The orientation and extinction angle corresponds to a soda rich orthoclase.
	www.minsocam.org /msa/collectors_corner/arc/orthoclasetx.htm (566 words)

	MYRMEKITE 37 of 50
		The orthoclase crystals are generally inhomogeneous, exhibiting various stages of inverting to microcline.
		Marmo (1958a) compared orthoclase with microcline and noted that orthoclase is the monoclinic modification of potash feldspar that is crystallized in laboratory melts.
		Collins (1997c, 1998a) further suggested that where K replaces Na and Ca in triclinic plagioclase, the triclinic microcline would result by inheriting the triclinic lattice from the plagioclase and leave irregular islands of perthite lamellae of various sizes and in seemingly random distributions because of differential incomplete replacements.
	www.csun.edu /~vcgeo005/Microcline.htm (2509 words)

	Orthoclase (Site not responding. Last check: 2007-10-31)
		Orthoclase, another monoclinic variety, and microcline (triclinic) occur in a wide variety of igneous and metamorphic rocks that have crystallized at intermediate to low temperatures.
		Much orthoclase probably crystallized originally as sanidine, which subsequently underwent an ordering of some of its Al and Si atoms, but adularia is evidently a metastable form that has developed under conditions of rapid crystallization within the stability field of microcline.
		Orthoclase is the characteristic potassium feldspar of igneous rocks, occuring both alone and in perthitic intergrowth with albite; it also occurs in some metamorphic rocks.
	geology.csupomona.edu /alert/mineral/orthoclase.htm (331 words)

	IngentaConnect Glass ceramics in the system diopside-anorthite-orthoclase prepar... (Site not responding. Last check: 2007-10-31)
		Waste by-pass cement dust, formed during the manufacturing of Portland Cement, was used in the glass batches in amounts ranging between 25–37 wt% of the batch constituents.
		Depending on the composition batches were melted in the range 1300–1400°C. The glasses obtained and their corresponding heat treated specimens were examined by DTA, x-ray, SEM and optical microscopy.
		Microcline phase was formed with diopside and anorthite when the percentage of the nominal orthoclase reaches 20 or 30 mol%.
	www.ingentaconnect.com /content/sgt/gt/2001/00000042/00000006/4206160 (284 words)

	Orthoclase (Site not responding. Last check: 2007-10-31)
		Orthoclase is a polymorph of other minerals that share the same chemistry, but have different crystal structures.
		Other than that, enviroment of formation is the only other hand sample clue to distinguish orthoclase from sanidine or anorthoclase.
		Optical properties and x-ray techniques are the only sure ways to distinguish orthoclase from sanidine, microcline and anorthoclase.
	socrates.berkeley.edu /~eps2/wisc/moreorth.html (423 words)

	Alkali Feldspar Series Members
		Orthoclase crystallizes in the same crystal system and class as sanidine and anorthoclase (monoclinic 2/m) but the distribution of Al and Si in orthoclase is partially ordered in orthoclase due either to the lower temperature or crystallization or to a slower rate of cooling.
		Orthoclase typically forms in intrusive rocks that cooled fairly slowly.
		is the alkali feldspar that typically crystallizes at low temperature (lower than orthoclase) or as a result of a very slow cooling rate.
	www.utexas.edu /tmm/npl/mineralogy/Science_of_Minerals/AlkalFfeldsparSeries.htm (521 words)

	Orthoclase Mineral Data
		From the Greek orthos - "right" and kalo -" I cleave" in allusion to the mineral's right angle of good cleavage.
		Warning: this large pop-up is very compute intensive and may not work well with some computers.
		Colville A A, Ribbe P H, American Mineralogist, 53 (1968) p.25-37, The crystal structure of an adularia and a refinement of the structure of, orthoclase, Note: Spencer B, variety adularia
	webmineral.com /data/Orthoclase.shtml (281 words)

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