
	Where results make sense

Topic: Cummingtonite

Related Topics

Silicate minerals

	Cummingtonite - Wikipedia, the free encyclopedia
		Cummingtonite or magnesium iron silicate hydroxide is a metamorphic index mineral with the chemical composition (Mg,Fe)
		The cummingtonite series is polymorphic with the anthophyllite-gedrite series and often requires optical or X-ray diffraction analysis to distinguish the polymorphs.
		Cummingtonite was first described in 1824 for an occurrence near Cummington, Massachusetts, hence the name.
	en.wikipedia.org /wiki/Cummingtonite (669 words)

	cummingtonite.htm (Site not responding. Last check: 2007-10-13)
		JACKSON COUNTY: Pale green cummingtonite occurs in a complex assemblage of amphiboles in the iron formation at the Jackson County Iron Mine (SE Sec.
		OCONTO COUNTY: Cummingtonite is associated with hornblende and plagioclase in the metamorphosed mafic lava flows of the Waupee Formation near Mountain (Lahr, 1972).
		ONEIDA COUNTY: Cummingtonite occurs with talc in the metamorphosed chemical sedimentary rocks at the Lynn massive sulfide deposit (Kennedy et.
	www.uwrf.edu /~wc01/cummingtonite.htm (235 words)

	Viddy This: Cummingtonite?
		Cummingtonite is the name of a series as well as the name of a mineral.
		The mineral cummingtonite, is basically the middle member of the Cummingtonite Series, which include the minerals grunerite and magnesiocummingtonite.
		Cummingtonite by default has a ratio of 0.30 to 0.69, the majority of the middle and as can be expected is the most common member of the series.
	viddythis.blogspot.com /2005/06/cummingtonite.html (176 words)

	CUMMINGTONITE (Magnesium Iron Silicate Hydroxide)
		Cummingtonite and anthophyllite are polymorphs, a situation where two minerals share the same chemistry but have different structures (poly=many, morphs=shapes).
		In the case of anthophyllite and cummingtonite; anthophyllite is orthorhombic and cummingtonite is monoclinic.
		Cummingtonite is a common component of some regional metamorphic rocks.
	mineral.galleries.com /minerals/silicate/cummingt/cummingt.htm (433 words)

	What do you know about Cummingtonite? (Site not responding. Last check: 2007-10-13)
		Cummingtonite or magnesium iron silicate hydroxide is a metamorphic index mineral with the chemical composition (Mg,Fe)7Si8O22(OH)2.
		Cummingtonite is commonly found in regionally metamorphosed rocks and occurs in amphibolites.
		Cummingtonite has also been found in some felsic igneous rocks such as dacites.
	gemstones.nowmore.net /Cummingtonite.htm (488 words)

	Tephra Set M--PRE-1980 TEPHRA-FALL DEPOSITS ERUPTED FROM MOUNT ST. HELENS, WASHINGTON
		In addition, the progressive upward substitution of hypersthene for cummingtonite in ferromagnesian mineral suites identifies the set wherever enough layers are present.
		Ferromagnesian mineral suites from its pumice consist almost entirely of cummingtonite and olive hornblende; small amounts of hypersthene and biotite were found in some samples.
		Cummingtonite and hornblende make up most of the ferromagnesian mineral suites from the pumice, but small amounts of olivine are consistently present.
	pubs.usgs.gov /pp/p1563/tephrasetm.html (2396 words)

	CUMMINGTONITE Chapter17. Inosilicates - chain silicates (Site not responding. Last check: 2007-10-13)
		Cummingtonite, an iron magnesium silicate hydroxide mineral of the amphibole group, was first reported from Sterling Hill (as grunerite) by Reilly (1983).
		It occurred as small dark-brown needle-like crystals, as an alteration product of diopside, and was associated with franklinite, titanite, and calcite in drill-hole #124, 111 feet from its origin on the 340 level.
		Cummingtonite was also found as an alteration product of hedenbergite and iron oxides, associated with andradite, ferroactinolite, franklinite, and calcite in drill-hole #124, 119 feet from its origin.
	franklin-sterlinghill.com /dunn/ch17/cummingtonite.stm (166 words)

	Analytical electron microscopy of nanometer-scale hornblende lamellae; low-temperature exsolution in cummingtonite -- ...
		Cummingtonite from central Massachusetts, which has experienced pervasive exsolution of hornblende, contains numerous hornblende precipitates (lamellae and discs) ranging in thickness from 2.5 mu m to 4 nm that represent multiple generations of exsolution.
		The smallest precipitates were investigated using transmission electron microscopy and analytical electron microscopy to characterize the coherent cummingtonite-hornblende solvus at low temperature.
		The composition of the cummingtonite host between nanometer-scale discs is very low in both Ca and Al relative to bulk cummingtonite analyses that were obtained from electron microprobe analyses of 1-2 mu m areas.
	ammin.geoscienceworld.org /cgi/content/abstract/82/11-12/1079 (444 words)

	Abstract - cummingtonite (Site not responding. Last check: 2007-10-13)
		Although the lattice parameters a, b and ß should be a function of the cummingtonite content, no correlations were observed between the compositions derived by EMP and the lattice parameters.
		According to this observation it was possible to determine precisely the cummingtonite content by IR-spectroscopy.
		This is considerable less than the 10 mol% cummingtonite in tremolite often claimed for synthetic tremolites.
	www.univie.ac.at /Mineralogie/abstract/cummingtonite.htm (262 words)

	Rutherford
		Cummingtonite typically occurs as euhedral overgrowths on some hornblende crystal faces, and biotite is commonly present as euhedral to anhedral inclusions.
		In contrast, cummingtonite is present as rims on many hornblendes and as small euhedral crystals in contact with melt, and is quite uniform in composition (table 1).
		The phenocryst-melt assemblage in the white dacitic pumice of Mount Pinatubo is interpreted to be an equilibrium assemblage.
	pubs.usgs.gov /pinatubo/ruth (7302 words)

	Hanhisalo
		The mineralised cummingtonite gabbro is bordered by a disintergrated leucogabbro.
		free) in chilled margin of the cummingtonite gabbro is 12.20 w-% and in chilled margin of the leucogabbro 4.57 w-% [2].
		The subvertical mineralisation is located in the upper parts of the subvertical intrusion body near the southern contact extending in the middle of the body in the deeper parts of the intrusion body.
	www.gsf.fi /explor/nickel/hanhisalo.htm (768 words)

	Metamorphic minerals image gallery
		Cummingtonite in a hornblende - biotite - cummingtonite amphibolite.
		Close-up view of the hornblende exsolution lamellae in cummingtonite, coming out on the two irrational planes approximately parallel to {100} and {001}.
		Some colorless cummingtonite exsolution lamellae can be seen in the hornblende above the cummingtonite.
	www.union.edu /PUBLIC/GEODEPT/COURSES/petrology/met_minerals.htm (1162 words)

	ANTHOPHYLLITE (Magnesium Iron Silicate Hydroxide)
		Although it can be differentiated from other amphiboles by its white to brown color, it is often indistinguishable from other amphiboles such as cummingtonite.
		Cummingtonite and anthophyllite are actually polymorphs, a situation where two minerals share the same chemistry but have different structures (poly=many, morphs=shapes).
		Anthophyllite is metamorphic and is found in gneisses and schists derived from magnesium rich igneous or dolomitic sedimentary rocks.
	mineral.galleries.com /minerals/silicate/anthophy/anthophy.htm (400 words)

	Cummingtonite (Site not responding. Last check: 2007-10-13)
		Cummingtonite from the famous Homestake Gold Mine in Lead, South Dakota.
		CRYSTAL GROWTH AND HABITS - Cummingtonite occurs as bladed or columnar crystals.
		It commonly produces fibrous aggregates that may be plumose.
	www.gc.maricopa.edu /earthsci/imagearchive/cummingtonite.htm (132 words)

	Cummingtonite: Cummingtonite mineral data from mindat.org mineralogy database
		Cummingtonite: Cummingtonite mineral data from mindat.org mineralogy database
		Cummingtonite Type Locality, Cummington, Hampshire Co., Massachusetts, USA
		Yang, H., Hazen, R.M., Prewitt, C.T., Finger, L.W., Lu, R., and Hemley, R.J. (1998) High-pressure single-crystal X-ray diffraction and infrared spectroscopic studies of the C2/m-P2 1/m phase transition in cummingtonite.
	www.mindat.org /min-1170.html (265 words)

	[No title]
		Late fractures through opx are filled with magnetite and fine-grained mineral which is possibly talc or cummingtonite.
		Metamorphic fluids formed hbd + cummingtonite (or talc) + actinolite.
		Cummingtonite Tr Opx Small needles at outer rims of opx.
	www.ngdc.noaa.gov /mgg/geology/odp/data/118/733D/hrthin.txt (398 words)

	cummingtonite (Site not responding. Last check: 2007-10-13)
		Cummingtonite in scripture granite and quartz matrix, from County Västmanland, Sweden
		"Cummingtonite is an Amphibole Group mineral; and any mineral of the group is considered to be an "asbestos" if it is found in fibrous form, which will be "soft" and "silky" to the touch."
		This cummingtonite is not at all soft and I would doubt very much that it is therefore, fibrous.)
	www.francesjane.com /cummingtonite.html (172 words)

	AMCSD Search Results
		A further refinement of the crystal structure of cummingtonite
		Crystal structure of a P2_1/m ferromagnesian cummingtonite at 140 K
		Multiple datasets can be concatenated into a single downloadable file by selecting the datasets and then hitting the "Process Selected Data" button.
	rruff.geo.arizona.edu /AMS/result.php?mineral=Cummingtonite (327 words)

	Hyvelä
		The thickness of soil is in average 9 meters
		Hyvelä Ni-Cu deposit is hosted by 400 x 20–100 m wide and at least 650 m deep intrusion composed mainly of norite and cummingtonite gabbro with small perknite bodies within intensely deformed kinzigitic mica gneisses in the Vammala migmatite belt.
		Main minerals are orthopyroxene, poikilitic plagioclase, cummingtonite, pale brown hornblende and biotite.
	www.gsf.fi /explor/nickel/hyvela.htm (326 words)

	thebackpacker.com - trail talk - and now it's time....
		It got its name from the locality where it was first found, Cummington, Massachusetts, USA.
		4:03:07 PM “Well, the cleavage in cummingtonite is good in two directions.
		4:04:45 PM “Not only that, but cummingtonite is part of a chemical series of minerals; the cummingtonite-grunerite series.
	www.thebackpacker.com /trailtalk/thread/25185,-1.php (252 words)

	Article Summary
		In it A. Winchell discussed why he believes that anthophyllite and cummingtonites are not dimorphous because they contained less then 40% of ferrous iron and cummingtonites and grunerites contained 40% or more.
		They believe the reason for these differences are due to the intergrowth of brucite in the mountain wood.
		Cordierite - Anthophyllite - Cummingtonite Rocks from the Lar Deposit, Laurie Lake, Manitoba is an article from Canadian Mineralogist vol.
	www.und.nodak.edu /instruct/mineral/geol318/webpage/jacobson/summary.htm (751 words)

	ACTINOLITE IN KIRUNA-TYPE IRON DEPOSITS I: UPPER-THERMAL STABILITY OF MG-RICH ACTINOLITE
		Compositional changes were monitored by electron microprobe analysis of amphibole rim compositions and/or overgrowths on the original tremolite.
		At 4 kbar and 900-800°C, tremolite shows strong re-equilibration with overgrowths of an Fe-rich but low-Ca (1.7>Ca>1.4) actinolite; Fe-rich cummingtonite (Ca<0.7) begins to nucleate at 860°C. At 800-700°C, tremolite shows weak re-equilibration but nucleation of Fe-rich cummingtonite is strong.
		Similar results were observed at 1 kbar, with tremolite showing strong re-equilibration to low-Ca actinolite at 790-600°C with cummingtonite nucleation at 800°C and below.
	gsa.confex.com /gsa/2004AM/finalprogram/abstract_78917.htm (460 words)

	Mineral description : Cummingtonite (Site not responding. Last check: 2007-10-13)
		Silicates : Inosilicates : Cummingtonite - Anthophyllite group.
		Separated from anthophyllite by clearly visible polysynthetic twinning in cummingtonite (along [100]).
		If you have some questions, suggestions or comments you are welcome to write me a line or two.
	www.geology.neab.net /minerals/cummingt.htm (80 words)

	[No title]
		N G118 0733D001D01012014002A0001 STA Foliated metagabbro Gneissic layering N/a Coarse Plagioclase Clinopyroxene Spinel Orthopyroxene Hornblende 25 18 2 12 3(?) 50 21 2 21 6 2-5 N/A N/A N/A N/A Ilmenite Anhedral Anhedral N/A Elongate Anhedral Relict porphyroclasts.
		Vesicles 0 Clays Actinolite Hornblende Plagioclase Magnetite Talc(?) Cummingtonite Clinopyroxene 1 3 (?) 25 1 2 5 3 px(?) Hbd Cpx, veins Plag Opx, ilmenite Opx Opx Cpx Late celadonite mixed with hematite.
		Vesicles 0 Actinolite Plagioclase Clinopyroxene Cummingtonite 3 40 5 Tr Opx,cpx Plag Cpx Opx Pale green, very small needles at opx and cpx margins.
	www.ngdc.noaa.gov /mgg/geology/odp/data/118/733D/hrthin.dat (375 words)

	mail isn't working; draculin, cummingtonite, Cristane - Topic Powered by eve community
		Your mailer has decided to refuse everything I send it.
		>Notwithstanding its name, cummingtonite is not an aphrodisiac.
		But as of today I started sending them from a different account, Wordcrafting@gmail.com.
	wordcraft.infopop.cc /groupee/forums/a/tpc/f/756604565/m/6691090382/inc/-1 (227 words)

	Petrogenesis of the contact-metamorphic rocks beneath the Stillwater Complex, Montana -- Labotka and Kath 113 (10): ... (Site not responding. Last check: 2007-10-13)
		zone at the contact and a 500–1500 m cordierite + cummingtonite
		assemblage cordierite + cummingtonite occurs at 600 °C, and hypersthene is stable above 700 °C. The net reaction
		during formation of cordierite + cummingtonite hornfels from
	bulletin.geoscienceworld.org /cgi/content/abstract/113/10/1312 (275 words)

	Activity-Composition Relationships in Multicomponent Amphiboles: An Application of Darken's Quadratic Formalism -- from ...
		In this, the thermodynamic behavior is expressed in terms of ideal mixing between real and fictive end-members, with the properties of the fictive end-members being constrained by the compositions of naturally coexisting amphibole pairs.
		The approach has been used to determine a-x relationships for calcic amphibole, sodic amphibole, cummingtonite, and othoamphibole solid solutions in the system Na2O-CaO-MgO-FeO-Al2O3-SiO2-H2O.
		This has been used to compare experimentally determined P-T-x conditions of formation of tremolite with those calculated by using our results.
	library.wolfram.com /infocenter/Articles/1000 (139 words)

	Halfbakery: Marble Keyboard
		Futher to this; as a geologist, I'd like to see keys made out of a rock the name of which starts with the letter of the key.
		I suspect this idea was all a thin veil as an excuse to have a public giggle about Cummingtonite.
		A few seem to have assumed it was the reason for the idea, but it wasn't, maybe I should change it to chrysotile, calcite, corundum or celestine.RE current academic status (you're a little off, but if thats how I come over then what the hell); I've just graduated from a four-year M.Geol (applied geology) Course.
	www.halfbakery.com /lr/idea/Marble_20Keyboard (2948 words)

	Sunday Times Meet & Mingle - Member Profile: cummingtonite
		Becoming a member is quick, easy and, best of all, free.
		cummingtonite has not yet answered any of the optional questions that would tell you more about her.
		Use of this site signifies your agreement to our terms of use and privacy policy.
	sundayt.datingbuzz.com /s/view/857223 (251 words)

Try your search on: Qwika (all wikis)