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Topic: Albite

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Feldspar

Beckerite

Celestite

Variscite

Amblygonite

Actinolite

Lepidolite

Chrysolite

Spodumene

Biotite

Peridot

Muscovite

Silicate minerals

Phlogopite

Pleochroism

	Albite - LoveToKnow 1911 (Site not responding. Last check: 2007-10-19)
		ALBITE, a mineral of the felspar group, belonging to the division of the plagioclases.
		Albite forms an essential constituent of many acidic igneous and crystalline rocks; in granites, diorites, andesites, andc., it occurs as a primary mineral, whilst in crystalline schists, phyllites and crystalline limestones it is of secondary (metamorphic) origin.
		The beautifully developed crystals so abundant in crystal-lined crevices of Alpine granites and gneisses have been deposited, with other minerals, from solution; the crystals lining veins in the slates of Tintagel in Cornwall have the same origin.
	www.1911encyclopedia.org /Albite (296 words)

	ALBITE (Sodium Aluminum Silicate)
		Albite is a common felspar and is the "pivot" mineral of two different feldspar series.
		Albite is the last of the feldspars to crystallize from molten rock.
		Albite is a common constituent of granitic and syenite rocks.
	mineral.galleries.com /minerals/silicate/albite/albite.htm (572 words)

	The Baringer Hill, Texas, Pegmatite
		The feldspar is a microcline-albite perthite, with the albite decidedly subordinate.
		The writer believes that this transverse albite is older albite which was present in the microcline perthite of the normal pegmatite, and that the tabular albite has replaced the perthite to such an extent that the original microcline has almost disappeared.
		Albite is an invariable associate of the rare earth minerals.
	home.satx.rr.com /robnjean/bh/landes1.html (2735 words)

	ALBITE Chapter 19. Tectosilicates and silicates with unknown structures
		Albite, a sodium aluminum silicate mineral of the feldspar group, was tentatively reported from Franklin by Larsen and Shannon (1922), but this material has been shown to be hyalophane.
		Albite was reported from the Buckwheat Dolomite by Palache (1908, 1935) and illustrated by Peters et al.
		The writer has observed probable white albite, in large masses with bannisterite, quartz, and richterite, and with actinolite and rhodonite, both from Franklin.
	franklin-sterlinghill.com /dunn/ch19/albite.stm (149 words)

	Albite: Factsheet & Information Page at mineralminers.com
		Albite is characteristic of low-grade regional and contact metamorphic rocks (greenschist, zeolite, and albite-epidote hornfels facies).
		Albite commonly occurs in pegmatites as anhedral to euhedral tabular crystals.
		Albite is said to enhance clarity of thought and improve one's ability to cooperate with others in a tactful manner.
	www.mineralminers.com /html/albminfo.htm (626 words)

	Exsolution
		Peristerite intergrowths exsolve when the initial composition of the plagioclase was 85 to 98% albite and 15 to 2% anorthite.
		The initial composition of the mixed plagioclase was 47 to 58% molecular anorthite and 42 to 53% albite.
		Huttenlocher intergrowths occur when the initial composition of the plagioclase was 60 to 85% molecular anorthite and 14 to 40% albite.
	www.utexas.edu /tmm/npl/mineralogy/Science_of_Minerals/Exsolution.htm (420 words)

	Plagioclase (Site not responding. Last check: 2007-10-19)
		Bytownite and labradorite are characteristic of igneous rocks of gabbroic composition and of the anorthosites; andesine, of andesites and diorites; oligoclase, of monzonites and granodiorites; albite, of granites and granitic pegmatites.
		The albite of pegmatites is of two distinct types; massive and lamellar, the latter widely referred to as cleavelandite.
		Albite and oligoclase are mined from some pegmatites and used in the manufacture of ceramics and as the abrasive in toothpaste.
	geology.csupomona.edu /alert/mineral/plagioclase.htm (229 words)

	He Hi She Lo - General Properties (Site not responding. Last check: 2007-10-19)
		Albite is useful in treating disorders of the eyes, restrictions of blood flow and walking or movement disorders.
		Albite encourages you to "flow" with situations and with relationships.
		Albite provides a connection to the psychic self and can awaken the energy of the third eye.
	www.hehishelo.co.uk /stones/Albite.htm (122 words)

	Albite
		Albite, in sharp glassy-white crystals twinned on the albite law and showing the forms listed, was found sparsely in cavities of the gray porous dolomite in the Buckwheat mine at Franklin) with calcite) quartz, and sphalerite.
		Massive white albite was recognized by Larsen and Shannon (220), as the chief gangue of bustamite crystals from Franklin.
		Although this albite was said to present some unusual features, no detailed statement of its character has been published.
	franklin-sterlinghill.com /palache/albite.stm (93 words)

	The plagioclase feldspar albite
		Albite is a very common mineral, and is an important rock-forming mineral.
		Albite is industrially important in the manufacture of ceramics.
		Albite is a common mineral, but localities where fine Albite crystals can be found are limited.
	www.minerals.net /mineral/silicate/tecto/feldspar/albite.htm (333 words)

	MYRMEKITE 46 of 50
		The albite nibble rim, being of nibble replacement, has widely taken place after the formation of K-feldspathization had ceased, although the nibble albitization here is much weaker than the nibble K-feldspathization.
		The average width of albite remnants should be less than the average width of perthitic albite in primary K-feldspar, and that is the case.
		A few albite remnants in the replacing K-feldspar, however, are wider than the average width of perthitic albite in the primary K-feldspar.
	www.csun.edu /~vcgeo005/2Rong.htm (3692 words)

	Mineral description : Albite
		Albite in the form of cleavelandite from Varuträsk.
		Albite in the form of albitite from Varuträsk.
		If you have some questions, suggestions or comments you are welcome to write me a line or two.
	www.geology.neab.net /minerals/albite.htm (148 words)

	Metamorphic rocks - Metamorphic Facies (Site not responding. Last check: 2007-10-19)
		Turner (1981) also distinguishes a pumpellyite-actinolite facies and a lawsonite-albite facies, transitional between the prehnite-pumpellyite, blueschist and greenschist facies, but Yardley considers these subdivisions too small to be of general practical use.
		In many metamorphic belts, the diagnostic assemblages of the zeolite and prehnite-pumpellyite facies are not seen, and the lowest grade rocks can be allocated to the greenschist facies.
		albite + epidote + actinolite + chlorite + quartz
	teachserv.earth.ox.ac.uk /courses/es2-metrock/1metfac.html (897 words)

	Mineralogical Pot Pourri
		Aplitic Albite Zone This zone is one of the main tantalum sources and is composed largely of pale blue to white, fine grained saccharoidal albite often in undulating layers.
		It is composed of microcline-perthite, quartz, albite, and muscovite with subordinate to rare beryl, Ta-oxides (mostly wodginite), spodumene, sulphides and apatite.
		The crystals are usually found at the interface between albite and quartz in the Main Zone and are often associated with good grade tantalum ore. Occasionally, the pinacoidal faces of the beryl crystals have a cap or zone of tiny columbite-tantalite crystals on the pinacoidal faces.
	www.davidkjoyceminerals.com /htmfiles/tancomine.htm (2903 words)

	Albite moonstone \| Gemstone Jewelry & Sterling Silver Jewelry \| Wonderstarter.com
		The sodium-rich end-member of the plagioclase feldspar group, called albite, from the Latin albus, because of its whitish color, may look similar in appearance to adularir moonstone if cut en cabochon.
		Furthermore, in both cases the composition is midway between that of orthoclase anC that of albite: albite moonstone can, in fact, be defined as 2 microperthitic association of albite and orthoclase with a predominance of albite.
		This is also found in adularia moonstone, but the twc are distinguishable by their density, which is higher (from about 2.62 to 2.65 g/cm3) in albite moonstone.
	www.wonderstarter.com /albite_moonstone.htm (288 words)

	Mineralogy texture and chemistry of fine-grained lepidolite bodies from granitic pegmatites (Site not responding. Last check: 2007-10-19)
		The objectives of this study was to examine textural relationships of fine-grained lepidolite-bearing assemblages in conjunction with chemistry in an attempt to determine the crystallization history of these lepidolite bodies.
		White albite was typically euhedral and medium-grained, ranging in size from 5-30 mm.
		The albite was medium grained and euhedral and all shared the following relationships: lepidolite occurring in albite, albite within quartz and albite intruding quartz.
	www.pegmatology.com /tkirkpatrickdoc1.htm (605 words)

	Feldspars
		The perthitic texture may be coarse and easily visible as slight variations in color in the crystal, or it may be microscopic and practically invisible.
		Albite, which may be considered either an alkali feldspar or a plagioclase, is found in some sedimentary rocks; in some sodium rich sediments it has actually grown as crystals rather than being detritus from the breakdown of other rocks.
		Albite is characteristic of metamorphic rocks formed below about 500 deg C; at higher temperatures more calcic species are characteristic.
	socrates.berkeley.edu /~eps2/wisc/feldspar.html (1301 words)

	Albite Mineral Specimens and Clevelandite Crystals
		The matrix of this specimen is solid clevelandite (a variety of albite).
		This beautiful specimen of white albite is a mass of clevelandite crystals (a variety of albite).
		This magnificent 356 pound pegmatite specimen has a pure white albite matrix with several fl tourmaline crystals (the largest of which measures 12" long x 6.5" in diameter and is visible in the center of the photo) and abundant silver colored muscovite mica plates from 2" to 11" in size.
	www.mineralminers.com /html/albmins.stm (689 words)

	THERMAL EFFECTS OF MAGMA DEGASSING
		A very explicit and potentially useful way to evaluate the heat of water exsolution from albite melt is through a function for water activity in the melt (awm) and Henry's law analog constant (kwma) (Burnham, 1994) which is derived from interpolation of experimental data (Burnham, 1994; Burnham and Davis, 1971; Burnham and Davis, 1974).
		The heat of water exsolution from albite melt can be applied to other melts because all thermodynamic functions of dissolved water in the melt are proportional to the molecular weight of dry melt normalized to eight atoms of oxygen as demonstrated by Burnham (Burnham, 1974; Burnham, 1975; Burnham, 1994).
		The issue of similarity of the thermodynamic properties of albite melt with dissolved water with other melt compositions has been addressed and it has been shown that the thermodynamics of albite melt - water system is applicable to a wide range of magmatic melt compositions (Burnham, 1975; Burnham, 1994).
	gaim.sr.unh.edu /csrc/gif/bubbles/Therm/Therm.html (7108 words)

	Albite - Wikipedia, the free encyclopedia
		Its specific gravity is about 2.62 and has a Mohs hardness of 6.
		Albite almost always exhibits crystal twinning often as minute parallel striations on the crystal face.
		Albite often occurs as fine parallel segregations alternating with pink microcline in perthite as a result of exolution on cooling.
	en.wikipedia.org /wiki/Albite (160 words)

	Exceptional Matrix Aquamarines (Site not responding. Last check: 2007-10-19)
		Bright blue aquamarines on albite, with a druze of muscovite.
		Something interesting about this piece: the muscovites on the albite crystals are never on upward facing side of the crystal (from the angle shown in the photograph.
		A cluster of cloudy aquamarines rising vertically out of a bed of muscovites, the largest of which is 2.2 cm.
	khyberminerals.com /aqua1.htm (534 words)

	Albite
		Albite is a plagioclase feldspar, feldspars that form as a solid-solution series from albite to anorthite.
		Albite is the sodium-rich end member of this series.
		Plagioclase feldspars are found all over the world as they are very common rock forming minerals.
	www.museums.udel.edu /mineral/mineral_site/collection/alphabetical/A/albite.html (52 words)

	Regional Metamorphism
		Both albite and pyrophyllite are absent from Amphibolite Facies rocks, whereas cordierite and the aluminum silicates andalusite (at lower grades) and sillimanite (at higher grades) characterize aluminous bulk compositions.
		Reactions distinctive of Buchan Facies Series are those defining the appearance of andalusite and cordierite, which combined with the disappearance of albite, mark the transition to the Amphibolite Facies.
		Pelitic rocks in the Granulite Facies are distinguished by the general absence of white mica, by the presence of alkali feldspar + sillimanite or orthopyroxene, and by the occurrence of the assemblage cordierite + orthopyroxene.
	geology.csupomona.edu /alert/metamorphic/regional.htm (2511 words)

	Volumetric Constraints on Transport of Granitic Magma through the Crust
		Magma temperature is calculated iteratively using the free energy-activity relationships for the crystallization of albite from a hydrous melt.
		Temperatures are those of the albite system and thus higher than those of actual granitic systems.
		Magmatic volume is calculated for the system albite-H2O after Burnham and Davis (1971; 1974) as a function of moles of the albite and H2O component in the melt and crystalline phases.
	www.soest.hawaii.edu /GG/HCV/NEWSV2N1/martha1.html (1475 words)

	Regional Metamorphism
		It is nearly pure albite in the chlorite and biotite zones, and becomes somewhat more calcic (oligoclase) in higher grade zones.
		Chlorite, sericite, quartz, albite, magnetite, ±garnet (highest grade greenschist facies).
		In 1961, Miyashiro noted that in the cicumpacific region, belts of high pressure, low temperature metamorphism on the oceanic side were associated with belts of high pressure, high temperature metamorphism on the continent side.
	www.tulane.edu /~sanelson/geol212/regionalmetamorph.htm (2430 words)

	Albite
		ALBITE is Sodium Aluminum Silicate, a Tectosilicate of the Feldspar Group and the Plagioclase series (sodium plagioclase feldspar) being at one extreme having sodium but no calcium; thus why there is so much confusion with it, Aventurine, Sunstone, and others of this complicated family.
		In fact, some Moonstones are a cut and polished form taken from Albite, see the Moonstone entry...
		Magickally, Albite is more stable than Moonstone; soothes the mental processes, and is good in meditation and concentration exercises.
	www.denelder.com /crystals/albite.html (167 words)

	Plagioclase Summary
		Plagioclase blends can occur along a linear continuum from albite to anorthite, intermediate minerals being mixtures of both.
		A plagioclase with less than 10% anorthite is classified simply as albite, while one with less than 10% albite is classified simply as anorthite.
		A continuous, evenly represented series of plagioclases is not actually found in the field; oligoclases with anorthite percentages in the low twenties are most common, while some other points on the continuum are scarcely represented at all.
	www.bookrags.com /Plagioclase (828 words)

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