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Topic: Andesine

	ANDESINE (Sodium Calcium Aluminum Silicate)
		Andesine is only a minor constituent in most granites and syenites.
		Andesine is a member of the Plagioclase Feldspar Group.
		Andesine by definition must contain 70-50% sodium to 30-50% calcium in the sodium/calcium position of the crystal structure.
	mineral.galleries.com /minerals/silicate/andesine/andesine.htm (319 words)

	Precious and semi precious gemstones, rare gems, jewelery, golden and platinum nuggets, meteorites, diamond necklaces.
		Andesine is an intermediate member of the plagioclase series, close to Labradorite.
		The "Chinese Andesine" (also called "Tibet Sunstone" or "Tibet Andesine") on the market is not as pure, and the red stones appear to have a brownish tone that is not present in the Congo Andesine.
		In addition, Andesine is considerably rarer than Tanzanite; compare the few hundred stones of Andesine found to date to the tens of thousands of Tanzanites.
	www.gemfrance.com /article.php?id_article=135 (1440 words)

	Carla A. White MS thesis abstract (Site not responding. Last check: 2007-11-04)
		The ankaramites and alkali olivine basalts are characterized by the presence of large xenocrysts of rimmed chromium diopside, titaniferous salite, olivine (Fo83 to Fo88), magnetite and sometimes plagioclase (bytownite rimmed by labradorite).
		The trachytes are characterized by phenocrysts of aegirine-augite, anorthoclase, magnetite, biotite and sometimes andesine rimmed by an alkali feldspar.
		The phenccrysts of the latite andesites and trachyte lie in a groundmass consisting of andesine, alkali feldspar, magnetite, hematite and biotite.
	www.albany.edu /geosciences/cwhitems.html (275 words)

	Andesine - LoveToKnow 1911
		ANDESINE, a member of the group of minerals known as plagioclase felspars, occupying a position in the isomorphous series about midway between albite (NaA1S1308) and anorthite (CaAl2S1208); its chemical composition and physical characters are therefore intermediate between those of the two extremes of the series.
		Distinctly developed crystals or crystallized specimens are rarely met with, the mineral usually occurring as embedded crystals and grains in the igneous and gneissic rocks, of which it forms a component part.
		This page was last modified 17:48, 12 May 2006.
	www.1911encyclopedia.org /Andesine (102 words)

	Andesine Jewelry (red andesine 14k earrings and pendants)
		Natural red andesine was only recently found in Tibet, and it is one of the "newest" rare gems to be discovered.
		Red andesine feldspar is one of the "newest" and most beautiful rare gem materials to be discovered.
		We have a limited supply of natural red andesine 14k jewelry and natural orange andesine 14k jewelry items in stock at our mineral warehouses, so be sure to let us know if you have any andesine jewelry special requests.
	www.mineralminers.com /html/anejlry.stm (931 words)

	Union College Geology Department, field trips attended by Kurt Hollocher, NYSGA 2002 field trip B1
		This is a charnockite containing large xenocrysts of gray andesine like that in the anorthosites.
		On the right is the corona stratigraphy, on the left is part of the reactions thought to generate the coronas.
		Large andesine crystal at top center is ~20 cm long.
	www.union.edu /PUBLIC/GEODEPT/hollocher/kth/field_trips/nysga_2002.htm (260 words)

	Yellow Labradorite 4.5 ct. oval gemstone (Site not responding. Last check: 2007-11-04)
		Both Andesine and Labradorite are extremely rare and difficult to find gemstones and until now it was not known if the latest gemstone find in 2002 was Labradorite, Andesine or something else.
		The comparison is not being made because of the color of the gemstone (both are spectacular but they are not even similar in color), but for the small amount of rough found and the short lived mining expected for this gemstone find (rumor says it is almost mined out already).
		Andesine is a pricier gemstone than Labradorite and with the information that this is a Brand New Gem it is expected that these appraisal prices will escalate dramatically.
	portland.craigslist.org /mlt/jwl/252229340.html (622 words)

	Plagioclase Summary
		For example, a plagioclase crystal may consist of an andesine core (30–50% anorthite) surrounded by thin shells or zones of labradorite (50–70% anorthite) alternating with zones of andesine.
		Andesine is a characteristic mineral of rocks such as diorite which contain a moderate amount of silica and related volcanics such as andesite.
		Labradorite is the characteristic feldspar of the more basic rock types such as diorite, gabbro, andesite or basalt and is usually associated with one of the pyroxenes or amphiboles.
	www.bookrags.com /Plagioclase (828 words)

	USGS Spectroscopy Lab - Clark et. al. 2003 Spectral Library splib05a
		Andesine is a plagioclase feldspar series mineral whose end members are albite (Na) and anorthite (Ca).
		Andesine falls into the 30-50% anorthite category in this series.
		This sample is a mixture of different phases and was labeled andesine porphyry.
	pubs.usgs.gov /of/2003/ofr-03-395/DESCRIPT/M/andesine_hs142.html (142 words)

	Speaking of price hikes.. (Site not responding. Last check: 2007-11-04)
		Since you bought up andesine, I have heard that there is a certain percentage of some other element or mineral in that for it to be considered andesine.
		Vendor #2-This is andesine, and it's from Mongolia,that congo stuff has been mined out .
		As far as andesine and red laboradite goes, I have an original batch of stones I was told was andesine from the congo which I purchased in 2002 it has a significantly lower RI than the red andisine stones that were supposed to be from china.
	www.pricescope.com /idealbb/view.asp?topicID=38620 (9431 words)

	Andesine/Red Laboradite - Does it matter
		Most feldspars, which include the very closely related plagioclases labradorite and andesine, are about the same hardness as Tanzanite: 6 to 6.5 on the Mohs scale.
		The TV Host said that they knew that in order for them to unequivocably say that the material was Andesine, the "Labradorite" must contain certain mineral elements - since they could not test all the material, they felt more comfortable calling it "Labradorite" until they could provide conclusive results from testing.
		Well, he went on to say that red labradorite used to be called andesine.
	www.pricescope.com /idealbb/view.asp?topicID=40387 (3127 words)

	plagioclase.htm
		- Labradorite and andesine are common in gabbro exposed in sec.
		BAYFIELD COUNTY: Plagioclase (labradorite and andesine) is abundant in gabbros exposed throughout sec.
		long of andesine rimmed by oligoclase occur in a mafic pluton exposed in the Red Rock quarry #510 (Koss Pit) in Sw sec.
	www.uwrf.edu /~wc01/plagioclase.htm (1677 words)

	New Member Hello/Andesine ? [Archive] - YourGemologist / International School of Gemology Forums Board (Site not responding. Last check: 2007-11-04)
		Not only are Alexandrite and Andesine visually nothing alike, but the refractive indices are no where close to one another.
		Even the Russian lab Alexandrite is going to be close to what you may have paid for the Andesine, so it is going to be a personal call on this one.
		Because some of the green andesine has a color shift and shows dark bluish green in some directions and reddish purple in another direction.
	www.yourgemologist.com /ISGForumsBoard/archive/index.php?t-1352.html (1359 words)

	Gemstone Forecaster Vol. 24, No.2
		The six members of the feldspar group are albite, oligoclase, andesine, labradorite, bytownite, and anorthite.
		Apparently, the technical difference between andesine and labradorite is the chemical ratio of sodium to calcium.
		Andesine probably competes with spessartite garnet and tanzanite.
	www.preciousgemstones.com /gfsummer06.html (5894 words)

	Petrography and Lithology Part Two
		The least altered rocks contain plagioclase feldspars with microprobe determined compositions that range from anorthite to albite but with most analyses falling in the range from calcic-andesine to calcic-oligoclase (Figure 23).
		In contrast to the strong chemical differences in plagioclase feldspars in rocks of magmatic and metasomatic origin, the potassium feldspar in magmatic assemblages is not significantly different in composition from that in rocks that have undergone potassium metasomatism.
		Potassium feldspar ranges in composition from Or to Or when in association with either andesine or albite (Figures 23 and 24).
	www.fortunecity.co.uk /safaripark/lamprey/108/pnlith2.htm (4161 words)

	Andesine Gemstones
		Andesine is an unusual plagioclase feldspar variety which is extremely rare in gem grade pieces with orange to red colors.
		This rare size bi-color andesine gemstone is completely natural, it has not been heated or treated in any way.
		We have a limited quantity of natural color red andesine, natural color orange andesine, and natural color golden andesine gemstones in stock, so be sure to let us know if you have any andesine gemstone special requests.
	www.mineralminers.com /html/anegems.stm (1550 words)

	[Ganoksin] Red Labrodite? It's one of the gem world's new darlings - but what is it?
		Other companies also sold the stone as andesine, "Congo sunstone," "red labradorite," or occasionally the more factual "red feldspar." And just to make things a little more confusing, the same material is also found in green.
		The gems sold as andesine are probably just that -- a feldspar with the right blend of elements to put it in the andesine category.
		Genuine andesine of facetable quality is very rare, and priced accordingly -- up to $1,700 per carat for the best examples.
	www.ganoksin.com /borisat/nenam/red-labrodite.htm (769 words)

	Untitled Document (Site not responding. Last check: 2007-11-04)
		In these histograms one can see a unimodal population that must include a significant amount of oligoclase, and minor andesine, and some mixture of andesine and albite.
		The simplest interpretation that would maintain a unimodal population of An contents would be that the uncertain material is mainly andesine.
		A histogram chart of An contents from a HALIP diabase sill on Midterhuken shows a large spread, and lava flows in Kong Karls Land to the east have reported An contents that vary from andesine to labradorite.
	maps.unomaha.edu /Maher/svalbard/2002GSAtalk/s24.html (147 words)

	Plagioclase (Site not responding. Last check: 2007-11-04)
		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.
		The plagioclases are also common in metamorphic rocks; in low-grade schists and gneisses, the plagioclase is typically albite; in medium-grade rocks, it is typically oligoclase or andesine.
	geology.csupomona.edu /alert/mineral/plagioclase.htm (229 words)

	1.2 ctw 6mm Heart Shaped Red Andesine-Labradorite Earrings in 14kt Yellow Gold
		Andesine-Labradorite is hard to find and appears to be available in very limited quantities.
		Andesine-Labradorite is a Feldspar with composition that puts it on the border of Andesine and Labradorite in terms of classification.
		For practicality, each stone can’t be tested for chemical composition, so it is often referred to as simply Andesine-Labradorite.
	www.zaccardis.com /red-andesine-labradorite-heart-earrings.html (282 words)

	Andesine: Andesine mineral information and data.
		A Plagioclase Feldspar with an Albite : Anorthite molar ratio ranging from 50 : 50 to 70 : 30
		There is no specific data on health dangers or toxicity for this mineral, however you should always treat mineral samples as potentially toxic/dangerous and use sensible precautions when handling them.
		Richet, P. and Bottinga, Y. (1984b) Anorthite, andesine, wollastonite, diopside, cordierite, and pyrope thermodynamics of melting, glass transitions, and properties of the amorphous phases.
	www.mindat.org /min-220.html (190 words)

	RLE - Shopping.com
		Min 1.25ct 8x6mm Emerald Cut Andesine- Labradorite (In stock)
		Min 2.00ct 10x8mm Emerald Cut Andesine- Labradorite (In stock)
		Min 2.00ct 9x7mm Emerald Cut Andesine- Labradorite (In stock)
	www.shopping.com /xCC-RLE--acntv_com (249 words)

	Open multiple Loudfrog Stores
		Cherry Red Andesine Very rare gemstone-REDUCED for X-Mas New gemstone find -- Another gemstone getting its color from copper like the Paraiba Tourmaline
		Yellow Labradorite really clean Gemstones This Labradorite is some new cooper bearing Gemstones
		Rare color shift Green Andesine Cooper bearing color shift gems that looks like Alexandrite
	www.loudfrog.com /rssxml.aspx?CatID=15761 (274 words)

	TOPSTONES INTERNATIONAL© - WEBSHOP (Site not responding. Last check: 2007-11-04)
		NEAR PERFECT RED TO GREEN ANDESINE SQUARE 9CT
		SQUARE CUT GREEN TO RED ANDESINE 14.21 CT
		LARGE BLOOD RED EMERALD CUT ANDESINE 13.82 CT
	shop.topstones.com /mainIndex.asp (159 words)

	Shop eBay Canada Store - Gem Gems N Gemstones:: Andesine, Feldspar (Site not responding. Last check: 2007-11-04)
		8.45ct RARE ANDESINE RED LABRADORITE LONG BARREL $NR
		5.95cts TOP ANDESINE RED LABRADORITE FELDSPAR PS NR
		Use of this Web site constitutes acceptance of the eBay User Agreement and Privacy Policy.
	stores.ebay.ca /Gem-Gems-N-Gemstones (277 words)

	Andesine Gemstones and Apitite Gemstones Information (Site not responding. Last check: 2007-11-04)
		Red Aaa 1 72ct Andesine Sunstone 14k Gold Diamond Ring
		This Is The Greatest Information Available!to Go Through All The Info About Andesine Rare Gemstones And Pick Out Just A Couple Of Theis Researched The Very Best Andesine Rare Gemstones Sites On The Net
		Pricelot Of Loose Gemstones - Labradorite - Andesine - Real.
	www.gemstoneshelp.com /gemstones/AndesineGemstones (249 words)

	Andesine Gems - Buy Top Gem Quality Feldspar Labradorite and Andesine Gemstones at AwesomeGems.com
		Andesine Gems - Buy Top Gem Quality Feldspar Labradorite and Andesine Gemstones at AwesomeGems.com
		Red to very very slightly orangish-Red color, medium tone, moderately strong saturation
		Get in on Special Sales and stay posted on new gemstone listings!
	awesomegems.com /andesine.html (175 words)

	Shop eBay Canada Store - ASIANPRECIOUS Value Forever:: Andesine, Labradorite (Site not responding. Last check: 2007-11-04)
		Shop eBay Canada Store - ASIANPRECIOUS Value Forever:: Andesine, Labradorite
		NR~0.80ct AAA GREEN CHROME DIOPSIDE RUSSIA NOHEAT 7x5mm
		6.05cts NATURAL ANDESINE RED LABRADORITE PEAR $ NR
	stores.ebay.ca /ASIANPRECIOUS-Value-Forever (261 words)

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