
	Where results make sense

Topic: Glaucophane

Related Topics

Amphibole

Eclogite

Mineral

Luster

List of minerals

Hardness

Specific gravity

	Glaucophane - Wikipedia, the free encyclopedia
		Glaucophane is the magnesium-rich member and ferroglaucophane is the iron-rich member.
		Glaucophane's hardness is 5 - 6, and its specific gravity is approximately 3 - 3.2.
		Glaucophane forms in metamorphic rocks that are either particularly rich in sodium or that have experienced low temperature-high pressure metamorphism such as would occur along a subduction zone.
	en.wikipedia.org /wiki/Glaucophane (255 words)

	GLAUCOPHANE (Sodium Magnesium Iron Aluminum Silicate Hydroxide)
		Glaucophane is named from its typical blue color (in Greek glaucophane means "blue appearing").
		Glaucophane is the magnesium rich member and ferroglaucophane is the iron rich member.
		Glaucophane is formed typically in a highly metamorphic zone known by the geologic term blueschist facies.
	mineral.galleries.com /minerals/silicate/glaucoph/glaucoph.htm (259 words)

	Syros Mapping Rock Preview
		Glaucophane is the blue, acicular mineral that forms the anastomosing lineation on the surface.
		This rock is characteristic of the silicic units intercalated with the limestones throughout the field area in Greece.
		Glaucophane forms a weak, chaotic foliation in the rock.
	www1.gly.bris.ac.uk /~george/samples.html (556 words)

	Blueschist
		Glaucophane is an azure-blue, lavender-blue or bluish-fl mineral; giving the rock its name, and color.
		Typically the prismatic glaucophane crystals line up resulting in a distinct schistose foliation.
		Amphibolite is associated with major mountain building events when mafic igneous rocks (basalts or gabbros) are metamorphosed through depth of burial, and proximity to batholiths (click picture for larger version).
	csmres.jmu.edu /geollab/Fichter/MetaRx/Rocks/Blueschist1.html (168 words)

	GLAUCOPHANE SYNTHESIS: THE ROLE OF WATER (Site not responding. Last check: 2007-11-03)
		The inability to define the P-T stability field of glaucophane, a key index mineral of the blueschist facies, has motivated experimental work on this amphibole for many years.
		Ernst used the decrease in unit-cell volumes with increasing pressure to propose a transition boundary between two polymorphs of glaucophane.
		Subsequent work over the next 40 years concluded that the amphiboles that are formed at 0.8 - 3.2 GPa and 600-800° C are not ideal glaucophane and that there is no polymorphic transition.
	gsa.confex.com /gsa/2003AM/finalprogram/abstract_61603.htm (492 words)

	Blueschist - Wikipedia, the free encyclopedia
		Blueschist (IPA: /ˈbluːʃɪst/) is a rock that forms by the metamorphism of basalt and rocks with similar composition at high pressures and low temperatures, approximately corresponding to a depth of 15 to 30 kilometers and 200 to ~500 degrees Celsius.
		Blueschist, as a rock type, is defined by the presence of the minerals glaucophane + (lawsonite or epidote) +/- jadeite +/- albite or chlorite +/- garnet +/- muscovite in a rock of roughly basaltic composition.
		Grain size is rarely coarse, as mineral growth is retarded by the swiftness of the rock's metamorphic trajectory and perhaps more importantly, the low temperatures of metamorphism and in many cases the anhydrous state of the basalts.
	en.wikipedia.org /wiki/Blueschist (519 words)

	[No title] (Site not responding. Last check: 2007-11-03)
		Occurs in low grade metamorphic rocks, associated with white mica, albite, quartz, chlorite, epidote, and occasionally lawsonite and jadeite.
		The picture on the left, in plane polarized light, is a mixture of lightly colored glaucophane, colorless white mica, and dark, high relief epidote in a low grade schist.
		On the right is a crossed polarizers view of a glaucophane schist with a large, isotropic garnet in the center, surrounded by highly birefringent glaucophane and white mica.
	www.humboldt.edu /~jdl1/web.page.images/glaucophane1.html (105 words)

	Glaucophane Spectrum (Site not responding. Last check: 2007-11-03)
		In this page and next one, I have recorded a few spectra on a blue schist thin section containing pleochroic glaucophane crystal.
		Those crystals have a very low 2V optic axes angle and a negative optic sign.
		This glaucophane is in fact the crossite variety.
	users.skynet.be /jm-derochette/Spectrometer/glaucophane_spectrum.htm (160 words)

	Alpine notes - Metamorphism - Blueschist with glaucophane (Site not responding. Last check: 2007-11-03)
		The slight blue tinge results from the mineral glaucophane (an amphibole), which here forms the rather stubby needles.
		This rock started life as a volcanic rock of basic composition, part of the old ocean floor of Tethys.
		Blueschists are comonly thought to be diagnostic of former subduction zones, because they imply relatively high pressure conditions relative to the temperature (compared to normal geothermal gradients).
	earth.leeds.ac.uk /alps/metamorphism/glauc.htm (72 words)

	glaucophane GLAUCOPHANE Sodium Magnesium Iron Aluminum Silicate Hydroxide
		Glaucophane is named from its typical blue color in Greek glaucophane means blue appearing The blue color is very diagnostic for this species It along with the closely related mineral
		Glaucophane is the magnesium and aluminum rich member and riebeckite is the ferrous and ferric iron rich member.
		Glaucophane is characteristically pleochroic in shades of blue and purple.
	www.vozrojdenie.com.ru /1146195186.html (982 words)

	PD DR. BERNHARD SCHULZ
		Assemblages with garnet, clinopyroxene and glaucophane of a HP-LT metamorphism M1, and NaCa-amphiboles (barroisite, magnesio-hornblende, actinolite) of a MP-MT metamorphism M2 crystallized during deformation D1.
		NaCa-amphiboles of M2, mantling glaucophane and crystallized in porphyroblasts, show first increasing, then decreasing AlIV and AlVI.
		In glaucophane-eclogites of a metamorphic zone I, a prograde evolution to M1 peak conditions at 400 - 500 °C/10 - 12 kbar was followed by a retrograde P-T path within the glaucophane stability field.
	www.designloft.de /bernhardschulz/research/projects.html (1646 words)

	[No title] (Site not responding. Last check: 2007-11-03)
		With the comment:"The iron-free end member is very rare, and in most glaucophane there is some replacement of Mg by Fe and of Al by Fe
		Analysis by Norma Vergo indicates glaucophane + chlorite + others.
		Glaucophane has light blue-purple pleochroism, amphibole cleavage, length slow, biaxial (-), small Z angle C, all consistent with glaucophane.
	speclab.cr.usgs.gov /spectral.lib04/DESCRIPT/glaucophane.hs426.html (155 words)

	FERROGLAUCOPHANE (Sodium Iron Magnesium Aluminum Silicate Hydroxide)
		Its name comes from its increased iron (or ferrous) content over that of it close cousin glaucophane.
		Ferroglaucophane and glaucophane have the same structure and the same chemistry except for their respective iron and magnesium content.
		Ferroglaucophane is similar to glaucophane but because of more iron in its formula it is slightly denser and generally darker in color with a duller luster.
	mineral.galleries.com /minerals/silicate/ferrogla/ferrogla.htm (222 words)

	David M. Jenkins
		Low-pressure stability of glaucophane relative to talc and albite
		The use of gallium as an analogue element for aluminum greatly facilitates locating where aluminum occurs in the crystal structure.
		His results agree with earlier studies on natural and synthetic glaucophane in recognizing the role that other amphibole components play in causing synthetic amphiboles to deviate from ideal glaucophane composition.
	www.geol.binghamton.edu /faculty/jenkins/jenkins.html (696 words)

	Glaucophane: Glaucophane mineral information and data.
		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.
		Ernst, W.G. (1963), Petrogenesis of glaucophane schists: Jour.
		Papike, J.J. and Clark, J.R. (1968a) Cation distribution in the crystal structure of glaucophane; II: the high pressure polymorph.
	www.mindat.org /min-1704.html (596 words)

	Glaucophane (Site not responding. Last check: 2007-11-03)
		Moderate birefringence, resulting in first- and second-order colors that are not too badly modified by its natural color.
		The light blue and purplish mineral with low relief below is glaucophane, seen in plane-polarized light.
		The light coloring of glaucophane has little effect on its interference colors.
	www.uwgb.edu /dutchs/PETROLGY/glaucoph.htm (101 words)

	Regional Metamorphism
		quartz, muscovite, albite, chlorite, lawsonsite, aragonite, ± jadeitic pyroxene ±glaucophane, ±stilpnomelane ±sphene
		Eclogite Facies rocks in the Franciscan are only found as exotic tectonic blocks measuring a few meters in diameter.
		epidote, glaucophane or crossite, actinolite, chlorite, albite, quartz, sphene
	www.tulane.edu /~sanelson/geol212/regionalmetamorph.htm (2430 words)

	Rock Collecting Four Corners Dendritic Agate, California
		Crossite (which appears as fl "needle" inclusions in the glaucophane) is occasionally found.
		When you reach the bend in the trail, you will see a huge green area in the cliffs in the distance along the beach.
		Here you can pick up many "pre-tumbled" pieces of glaucophane for tumbling, and some pieces for cutting.
	www.highdesertinsider.com /html/pvglauc.htm (515 words)

	Glaucophane Mineral Data
		Comments: Pale violet to gray fibrous massive glaucophane.
		Papike J J, Clark J R, American Mineralogist, 53 (1968) p.1156-1173, The crystal structure and cation distribution of glaucophane
		Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
	webmineral.com /data/Glaucophane.shtml (271 words)

	glaucophane - HighBeam Encyclopedia (Site not responding. Last check: 2007-11-03)
		Find newspaper and magazine articles plus images and maps related to "glaucophane" at HighBeam.
		Where the wild things are.(Little Black Book of Stories)(Book Review)
		More information is at your fingertips at HighBeam Research:
	www.encyclopedia.com /doc/1E1-x-glaucoph.html (189 words)

Try your search on: Qwika (all wikis)