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	Andalusite - LoveToKnow 1911
		Crystals of andalusite have the form of almost square prisms, the prism-angle being 89° 12'; they are terminated by a basal plane and sometimes by small dome-faces.
		Andalusite is typically a mineral of metamorphic origin, occurring most fre quently in altered clay-slates and crystalline schists, near the junction of these with masses of intrusive igneous rocks such as FIG.
		A curious variety of andalusite known as chiastolite is specially characteristic of clay-slates near a contact with granite.
	www.1911encyclopedia.org /Andalusite (409 words)

	andalusite.htm (Site not responding. Last check: 2007-10-26)
		The andalusite is partly altered to sericite and associated with quartz and muscovite (Smith, 1978).
		MARINETTE COUNTY: Andalusite altering to muscovite is found in metasedimentary rocks of the Quinnesec Formation along the South Branch of the Pike River south of Dunbar.
		OCONTO COUNTY: Andalusite is associated with sillimanite, mica, quartz and feldspar in the contact zone around the Hager granite in the vicinity of Mountain (Lahr, 1972).
	www.uwrf.edu /~william.s.cordua/andalusite.htm (527 words)

	Andalusite
		Andalusite is named after Andalusia, the province of Spain where it was first discovered.
		Andalusite is mined in Brazil and Sri Lanka.
		In the past andalusite was sometimes called "poor man's alexandrite" because it offers colour play at a low price, but in fact it does not actually bear much resemblance to alexandrite, which changes from green to red in different light.
	www.gemstone.org /gem-by-gem/english/andalusite.html (205 words)

	Andalusite
		Andalusite is commonly pink to red, but can be white or even green or gray or other colors.
		Andalusite (chiastolite) from a graphitic schist, Hamadan, Iran.
		The andalusite crystals are 1-6 cm long, zoned pink to red (Fe3+ variation), and some crystals are fractured and filled with fibrous sillimanite, which is folded.
	www.geo.umn.edu /orgs/whitney/andalusite.htm (372 words)

	Andalusite
		ANDALUSITE, a mineral with the same chemical composition as cyanite and sillimanite, being a basic aluminium silicate.
		Crystals of andalusite have the form of almost square prisms, the prism-angle being 89'12'; they are terminated by a basal plane and sometimes by small dome-faces.
		Andalusite is typically a mineral of metamorphic origin, occurring most frequently in altered clay-slates and crystalline schists, near the junction of these with masses of intrusive igneous rocks such as granite.
	www.jewelry-paideia.com /reference/ref-gemstone-andalusite-1.php (441 words)

	Andalusite - ZnetShows.com (Site not responding. Last check: 2007-10-26)
		Andalusite is named for Andalusia, the province of Spain in which it was first discovered.
		Andalusite is a yellow, green, or brown-red gem that displays strong pleochroism, which means that it will reveal these different colors as the observer changes his viewing angle.
		Andalusite is a material used in the manufacture of spark plugs, and as it is fairly unknown as a gem, the price for one or two carat pieces can be quite inexpensive.
	www.znetshows.com /LearnGemStone/Define/define_item.asp?ID=5 (178 words)

	Thaigem.com \| Info Center \| Gemstone Discovery \| Andalusite
		A unique variety of Andalusite is called "chiastolite" and contains fl/brown clay and/or carbonaceous material in crystal inclusions that are arranged in regular symmetrical shapes; usually in the form of a cross or X. Mined in Brazil and Sri Lanka, Andalusite also occurs in Andalusia, Spain; Austria; California, USA and China.
		Andalusite's associated minerals are cordierite, biotite, feldspars, quartz, kyanite and sillimanite.
		However, this could be viewed as technically incorrect as Andalusite features all its colors at the same time, whereas alexandrite changes from green to red in different sources.
	www.thaigem.com /dis_andalusite.asp (329 words)

	Structural and metamorphic characteristics of the Aston-Hospitalet domes
		Staurolite that is not a relic in andalusite is rimmed by large muscovite porphyroblasts that overgrow the main foliation (Figure 10e).
		In this sample, staurolite and andalusite porphyroblasts are anhedral and poikiloblastic with straight inclusion trails, that are oriented parallel to the main schistosity in andalusite, and obliquely oriented in the staurolite.
		Here, andalusite is found as an inclusion with embayed rim within cordierite, suggesting that andalusite was consumed to form cordierite (reaction 7), as postulated in section 4 c (Figure 12d).
	www.virtualexplorer.com.au /journal/2005/19/mezger/aston.html (3805 words)

	Andalusite: Andalusite mineral information and data.
		Pearson, G.R. and Shaw, D.M. (1960) Trace elements in kyanite, sillimanite and andalusite.
		Finger, L.W. and Prince, E. (1972) Neutron diffraction studies: andalusite and sillimanite.
		Burt, J.B., Ross, N.L., Angel, R.J., and Koch, M. (2006) Equations of state and structures of andalusite to 9.8 GPa and sillimanite to 8.5 GPa.
	www.mindat.org /min-217.html (718 words)

	Bedrock Geology Bath 100K Report - Metamorphism and Migmatization - Maine Geological Survey
		Within the staurolite + andalusite zone of metamorphism at the western edge of the map sheet (Figure 51) the typical mineral assemblage in pelitic rocks is muscovite-biotite-quartz- oligoclase-staurolite-andalusite.
		Andalusite occurs in two habits, as large poikiloblasts, and as idioblastic to hypidioblastic graphite-choked porphyroblasts commonly with retrograde muscovite rims.
		Where sillimanite occurs in the quartz veins, it can usually be found in minute amounts within biotite grains in the host schist, indicating that the grade of metamorphism is actually slightly higher than is suggested by megascopic occurrences of the critical indicator minerals in hand specimen.
	www.state.me.us /doc/nrimc/mgs/explore/bedrock/b42/meta.htm (770 words)

	Andalusite (Site not responding. Last check: 2007-10-26)
		Andalusite is pleochroic, different colors in different directions.
		Andalusite is the opposite: cutters try to orient the gem to get a pleasing mix of colors: orangey brown and a yellowish green or gold.
		Andalusite is mined in Brazil and Sri Lanka.
	www.stellarjewelry.com /andalusite.htm (209 words)

	Process for upgrading andalusite - Patent 4900431
		One of the important restrictions for commercialisation of andalusites is their content of iron which must be as low as possible and preferably not excede 1.5% expressed as Fe.sub.2 O.sub.3.
		The influence of the concentration of solids of the pulp during the conditioning which precedes the andalusite flotation on the result of this flotation is clearly demonstrated by comparision of two pilot tests carried out, one with a percentage by weight of solids of 25%, the other of 50%.
		The andalusite yields are the ratios of the weights of andalusite of the concentrate to that contained in the supply to the andalusite flotation (11).
	www.freepatentsonline.com /4900431.html (4902 words)

	Quartz 'N' All - High Quality Crystals, Minerals and Fossils Learn about Andalusite ( and Chiastolite )Page.
		Andalusite is the low-pressure, low density form of the three aluminium silicate polymorphs.
		Andalusite has been mined in large quantities in California and is used as a raw material for refractory (heat resistant) linings.
		Well known examples are the rich green pebbles of andalusite found in Sri Lanka and Minas Gerais Brazil.
	www.quartznall.co.uk /learnandalusite.htm (426 words)

	Andalusite (Site not responding. Last check: 2007-10-26)
		Still, andalusite is an interesting gem of strong pleochroism, showing green, brown and gold when viewed from different angles.
		Andalusite is usually found in small, waterworn pebbles, usually in sizes of one carat or less.
		Chiastolite, another variety of andalusite, was feared by early cultures and known as the "stone of death." This is because it commonly has a fl cross visible deep within the stone, as a result of its inclusions.
	www.dandennis.com /andalusite.htm (167 words)

	Andalusite - Information about Gemstones by Chard
		Andalusite is an attractive and unusual gemstone, first discovered in Andalucia, Southern Spain, after which it is named.
		Interestingly, "An Illustrated Dictionary of Jewellery" by Harold Newman describes andalusite as having strong dichroism, which is clearly incorrect as andalusite is biaxial not uniaxial, and therefore must be trichroic not dichroic.
		Because of the pleochroism, the colour of an andalusite can be affected considerably by the direction in which it is cut.
	www.24carat.co.uk /andalusite.html (468 words)

	Andalusite Mineral Specimens (also chiastolite specimens)
		There is a terminated andalusite crystal measuring an inch long at one end of this specimen (see close-up photo) that is semi-transparent with tiny gem grade areas and with pinkish-brown to greenish-brown colors depending on lighting and orientation.
		Some of the andalusite crystal's tips are in fair to good condition and have tiny gem grade areas with pinkish-brown to greenish-brown colors depending on lighting and orientation.
		Andalusite crystals with this pattern of inclusions are known as the andalusite variety chiastolite.
	www.mineralminers.com /html/anlmins.stm (784 words)

	Andalusite - Gem Stones
		Andalusite is pleochroic, different colors in different directions.
		When cutting most pleochroic gemstones, such as iolite and tanzanite, the trick is to minimize the pleochroism and maximize the single best color.
		Andalusite is the opposite: cutters try to orient the gem to get a pleasing mix of colors: orangey brown and a yellowish green or gold.
	www.mysticgames.com /gems/Andalusite.htm (134 words)

	[Ganoksin] Andalusite
		Andalusite has very strong trichroism; if you examine the green stones carefully, you can see green running in one direction and a reddish brown color in the other direction.
		Andalusite is not a common stone, but it can be found by the gem enthusiast.
		You probably won't run across a large selection of andalusite, but the best stones are those that have the strongest colors generally with a dark green predominating.
	www.ganoksin.com /borisat/nenam/andalusite.htm (362 words)

	Andalusite
		Andalusite is named after Andalusia, the province of Spain where it was first discovered.
		Andalusite is pleochroic, different colors in different directions.
		Andalusite is the opposite: cutters try to orient the gem to get a pleasing mix of colors: orangey brown and a yellowish green or gold.
	stellarjewelry.com /andalusite.htm (209 words)

	Multicolour.com > Gem Library > Gemstones Varieties > Andalusite
		Andalusite is best known for its strong pleochroism and it's unusual color which is frequently a mixture of both red and green.
		Andalusite is popular as a collector stone but is seldom used in jewelry probably because of it's unavailability.
		Andalusite, especially in the rough, can easily be confused with alexandrite because of similarities in color.
	www.multicolour.com /gemstones/andalusite.html (386 words)

	YourGemologist / International School of Gemology Study of the Gemstones: Andalusite
		As shown by the photograph above, andalusite is a combination of two to three colors, depending on how you look at it.
		The difference is that andalusite shows brown and green, rather than blue and purple of tanzanite.
		A fine quality andalusite can be a bit difficult to find and a bit pricey when you do.
	www.yourgemologist.com /andalusite.html (409 words)

	TEXTURAL RELATIONSHIPS
		Andalusite commonly shows irregular outlines interfingering with plagioclase and K-feldspar, and locally occurs as rounded blebs included in these minerals.
		Andalusite is also locally altered to randomly oriented white mica.
		Andalusite porphyroblasts contain oriented inclusion trails of ilmenite, usually oblique to the external foliation, or in some cases, they include oriented fibrolite crystals parallel to the external foliation (see also Shipboard Scientific Party, 1996).
	www-odp.tamu.edu /publications/161_SR/chap_19/c19_5.htm (1404 words)

	Andalusite (Site not responding. Last check: 2007-10-26)
		A crude Andalusite crystal that has been cut with a diamond saw on one end.
		This a view of another Andalusite crystal (variety Chiastolite) that has been cut perpendicular to the "C" axis.
		This is a single crystal of Andalusite from southern California.
	www.gc.maricopa.edu /earthsci/imagearchive/andalusite.htm (229 words)

	Andalusite Cross Stone Silver Jewelry Pendants, Chiastolite
		Andalusite is generally fl, brown and/or olive green.
		Discovered in Spain, Andalusite is a naturally occurring gemstone that forms crosses.
		Considered a talisman for the very psychic or sensitive as it is said to ground their energies.
	www.luckygemstones.com /andalusite-jewelry-cross-stone.htm (464 words)

	IngentaConnect Retrograde replacement of andalusite by Ca-Na mica in chloritoid-... (Site not responding. Last check: 2007-10-26)
		Andalusite porphyroblasts are totally pseudomorphosed by margarite–paragonite aggregates in aluminous pelites containing the peak mineral assemblage andalusite, chlorite, chloritoid, margarite, paragonite, quartz ± garnet, in a NW Iberia contact area.
		Their compositions, prior to retrogression, are used in the modelling, and have been retrieved by restoring the pseudomorph-forming elements into the current-depleted matrix, except for Al which is assumed to be immobile.
		Andalusite eventually disappears in relatively Al-poor rocks, resulting, as in this study, in a rock formed by chloritoid–chlorite as the only FM minerals, plus margarite–paragonite pseudomorphs of andalusite.
	www.ingentaconnect.com /content/bsc/jmg/2004/00000022/00000009/art00001 (403 words)

	Mineral description : Andalusite (Site not responding. Last check: 2007-10-26)
		The andalusite crystal is the red square at the right of the biotite flake.
		In metamorph rock as schist, quartzite and sometimes in pegmatites and hydrothermal veins.
		Andalusite is created in temperatures from 250-800 degrees C and pressures from 0 to 4 kbar.
	www.geology.neab.net /minerals/andalusi.htm (99 words)

	Whitney - andalusite paper figures (Site not responding. Last check: 2007-10-26)
		(b) Outcrop photograph of asymmetric quartz boudin with one large crystal of andalusite shown in end-section at the left side of the quartz lens.
		A thin rim of muscovite is present along the outer margin of the overgrowth.
		Pressure-temperature diagram showing the peak Barrovian conditions for the Gümüsler metapelitic rocks (point 1; Whitney and Dilek, 1998b), the formation of andalusite in the contact aureole of the Üçkapili pluton and formation of andalusite in veins (point 2), and the growth of sillimanite partially replacing andalusite (point 3).
	www.geo.umn.edu /orgs/whitney/andlfigs.html (358 words)

	The Dynamic Earth @ National Museum of Natural History
		Andalusite, kyanite, and sillimanite all contain the same elements.
		Andalusite is stable at low pressures and temperatures.
		Thousands of white, fibrous sillimanite crystals completely replaced the original rod-shaped andalusite crystals when this rock was subjected to a higher temperature.
	www.mnh.si.edu /earth/text/3_2_4_1.html (577 words)

	ANDALUSITE - Online Information article about ANDALUSITE
		Crystals of andalusite have the form of almost square prisms, the See also:
		Andalusite is typically a mineral of metamorphic origin, occurring most fre- quently in altered See also:
		A curious variety of andalusite known as chiastolite is specially characteristic of clay-slates near a contact with granite.
	encyclopedia.jrank.org /ANC_APO/ANDALUSITE.html (570 words)

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