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Topic: Hedenbergite

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	HEDENBERGITE Chapter17. Inosilicates - chain silicates
		Hedenbergite is found at both Franklin and Sterling Hill, but is an uncommon mineral at both localities, being restricted to a few anomalous assemblages, in keeping with the dominant Mn/Mg local solid solution and the paucity of iron silicates.
		Hedenbergite is a calcium iron silicate mineral of the pyroxene group and the Fe-analogue of diopside.
		Hedenbergite was found in an assemblage of calcite, franklinite, ferroactinolite, and andradite from drill-hole #124, 119 feet from its origin on the 340 level, surrounded by andradite and altering to cummingtonite and ferroactinolite (Reilly, 1983).
	franklin-sterlinghill.com /dunn/ch17/hedenbergite.stm (337 words)

	Bob's Rock Shop: Quartz with Hedenbergite Inclusions
		Hedenbergite is a member of the pyroxene group, which is an important and widely distributed group of rock-forming silicates.
		Hedenbergite is a member of the clinopyroxenes, which crystallize in the monoclinic system and contain calcium, iron, aluminum, sodium, or lithium.
		Hedenbergite crystals commonly occur as radiating fibrous aggregates, with stubby, prismatic crystals of nearly square cross section being rarer.
	www.rockhounds.com /rockshop/quartz9.html (536 words)

	HEDENBERGITE (Calcium Iron Silicate)
		Hedenbergite is a rock forming mineral in several metamorphic rocks, especially contact metamorphic rocks and skarns.
		Hedenbergite is a part of an important solid solution series of the pyroxene group.
		Hedenbergite is the iron rich end member of the series.
	mineral.galleries.com /minerals/silicate/hedenber/hedenber.htm (238 words)

	Barite from El Portal California
		Euhedral, prismatic crystals of a pyroxene near hedenbergite, which are commonly altered in an obscure fashion to an opaque mat.
		Cutting the glomeroblasts and isolated porphyroblasts of hedenbergite are ragged crystals of actinolite, growing at the expense of the hedenbergite, a change involving partial replacement of lime by iron oxide and magnesia.
		It is a crystalline limestone, in which the calc-silicate stage is represented by the growth of rounded quartz individuals and hedenbergite idioblasts.
	www.minsocam.org /MSA/collectors_corner/arc/cabarite.htm (1819 words)

	hedenbergite.htm (Site not responding. Last check: 2007-10-22)
		Description: Hedenbergite is a dark green to fl member of the pyroxene group.
		JACKSON COUNTY: Hedenbergite is an accessory in the iron formation at the Jackson County Iron Mine, near Black River Falls (SE sec.
		MARATHON COUNTY: Hedenbergite is reported by (Weidman (1904a and 1907b) from the nepheline syenites of the Stettin Pluton near Wausau.
	www.uwrf.edu /~william.s.cordua/hedenbergite.htm (154 words)

	Idaho skarns
		It is fairly well known for ilvaite and hedenbergite crystals.
		Hedenbergite is common, and may be the most abundant mineral making up the mass of the skarn deposits.
		Hedenbergite does sometimes form distinct crystalline groups or individuals, but most of it is compact radial masses of coarse crystals.
	www.lrream.com /idahoskarns.html (1469 words)

	Syenites From the Cuddapah Basin
		They are predominantly composed of alkali-feldspar (75-90 vol%) with subordinate amounts of mafics; the latter being mainly represented by a greenish-pink hedenbergite which occurs in the form of prismatic crystals.
		But from the given EPMA data the pyroxene is now identified as hedenbergite and in fact most of the optical characters of this pyroxene, as recorded by Sadashivaiah and Gowd Reddy, come closer to hedenbergite (see Deer et al.
		Nevertheless, it is clear from the petrography of the Gundlapalle syenite that hedenbergite has been partly or completely replaced by a rare hydrous mafic silicate namely nontronite and less frequently by amphibole and biotite.
	www.angelfire.com /az/ausaf/research.html (4264 words)

	Hedenbergite (Site not responding. Last check: 2007-10-22)
		In side of it, dark green hedenbergite crystals grow vertical to the vein as aggregate of coarse prismatic crystals.
		The center of this vein is composed of fine grained hedenbergite and andradite.
		In cracks and pockets, hedenbergite and small amount of epidote are observed.
	www.h5.dion.ne.jp /~nspicnic/mine/sample/hedenbergiteCHICHIBUe.htm (142 words)

	[No title]
		Allanite, apatite grp., chevkinite, fayalite, ferrohastingsite, hedenbergite, ilmenite, quartz, zircon.
		Aegirine, aenigmatite, albite, allanite, apatite grp., astrophyllite, bastnaesite, hatchetollite, hedenbergite, nepheline, olivine, orthoclase, pyrochlore, thorite, zircon.
		Aegirine, apatite grp., augite, biotite, calcite, feldspar grp., ferrosalite, hedenbergite, magnetite, nepheline, quartz.
	www.koeln.netsurf.de /~w.steffens/ukra.htm (313 words)

	Alan Guisewite's Mineral Collection Images: Systematic Inosilicates Page
		Actually, the only hedenbergite (calcium iron metasilicate) here is included in the quartz crystals, giving them that dark green coloration.
		Hedenbergite forms two series, one with diopside and one with johannsenite.
		Another specimen of hedenbergite - this miniature, with epidote after augite, comes from Tungsten Hills, Bishop, Inyo County, California.
	www.cs.cmu.edu /People/adg/adg-pssiimages.html (5654 words)

	The mineral hedenbergite
		Hedenbergite usually contains a slight amount of magnesium.
		Large crystals of this mineral are rare and highly sought after.
		Hedenbergite crystals are rare and in demand by mineral collectors
	www.minerals.net /mineral/silicate/ino/pyroxene/hedenber/hedenber.htm (120 words)

	[Jewelry making - Article 00861] - Re: [Orchid] Tashmarine - Next big thing?
		It forms a complete solid solution series with hedenbergite, which is a calcium iron silicate.
		In basic terms a solid solution series is a line, diopside is on one end and hedenbergite is on the other.
		There are essentially a limitless number of intermediate members of this series with variable magnesium to iron ratios between pure diopside on one end and pure hedenbergite on the other.
	www.ganoksin.com /orchid/archive/200412/msg00861.htm (885 words)

	The Giant Crystal Project : Dalnegorsk giant crystals, Far East Russia
		At the direct contact between igneous rocks and limestone a peculiar hedenbergite - wollastonite rock is present in large quantities with radiating hedenbergite crystal clusters, which often may reach diameters of 1 m and more.
		The very common hedenbergite crystals at the outer rims of the ore bodies often form giant spheres along the limestone contact.
		Crystals of hedenbergite, calcite and fluorite (and possibly Danburite and Datolite ?)may all reach sizes of up to 1 m (confirmed).
	giantcrystals.strahlen.org /asia/dalnegorsk.htm (808 words)

	Untitled Document
		The crystals on this specimen are prismatic in habit, terminated by small pinacoid faces.
		Hedenbergite and Augite are end members of a solid solution series, the principle difference being the amount of iron in the chemical formula.
		We are awaiting results of analytical testing on the material from this site to determine the exact composition; in the meantime we are calling them by both names.
	www.treasuremountainmining.com /web26haug1.htm (443 words)

	Inosilcates
		Pigeonite is also a monoclinic pyroxene with a composition similar to the orthopyroxenes with more Ca substituting for Fe, and Mg.
		Solid immiscibility is present between the Diopside - Hedenbergite series and the Orthopyroxene series.
		This is seen in the phase diagram below which shows a hypothetical phase diagram running from the orthopyroxenes to the clinopyroxenes.
	www.tulane.edu /~sanelson/geol211/inosilicates.htm (1766 words)

	Inclusions of minerals in Quartz Crystal, Rockhounding Arkansas
		They may be of two general types: early formed minerals that were captured by later formed quartz as it grew and minerals that were forming in or floating in the hydrothermal fluids that were deposited on the growing quartz crystal.
		Examples of the first type include rutile, actinolite, hedenbergite, some hematite, and tourmaline crystals that formed early and had rock crystal deposited on it, thereby encasing the early minerals.
		The latter type includes chlorite, cookeite, hematite, mica, pyrite, galena, adularia, and many others, that were deposited as the quartz was crystallizing.
	rockhoundingar.com /quartz/inclusions.html (200 words)

	Learn About Clinopyroxenes Page. Quartz 'N' All - High Quality Crystals, Minerals and Fossils
		Below you will find the geological properties and some further information regarding Clinopyroxenes.These include Diopside, Augite, pigeonite, hedenbergite, titanaugite, omphacite spodumene and jadeite.
		Augite is common in such igneous rocks as grabbos, basalts, pyroxenites and diorites; also in some high grade metamorphic rocks; diopside and hedenbergite occur in a number of metamorphic rocks, diopside in metamorphosed iron-rich sediments.
		augite in Bushveld Complex (South Africa), Skaergaad (Greenland), and Stillwater Complex, Montana USA, hedenbergite at Cap Calamita Elba (Italy), Arendel (Norway), and Obira (Japan), Diopside at Binnenthal (Switzerland), Vesuvius (Italy), the Zillertal (Austria), and the Urals and Lake Baikal (Russia).
	www.quartznall.co.uk /learnclinopyroxene.htm (253 words)

	Hedenbergite Information and links to specimens for sale
		Iron may replace some or all of the magnesium, darkening the crystal and forming the variety
		Hedenbergite is usually darker than its gemstone cousin diopside.
		Good crystals of hedenbergite are rare and specimens that show nice crystals, good color and luster are prized.
	www.minerals-n-more.com /Hedenbergite_Info.html (299 words)

	USGS Spectroscopy Lab - Clark et. al. 2003 Spectral Library splib05a
		By contrast, a sample of artificially prepared hedenbergite displays a single strong ferrous ion band near 1.1 µ."
		Found: Clinopyroxene consistent with hedenbergite, minor quartz, unindexed weak to very weak reflections at 8.6, 3.16, 3.11 angstroms
		Comment: Clinopyroxene pattern that is distinct from that of diopside (such as HS-15.3B).
	pubs.usgs.gov /of/2003/ofr-03-395/DESCRIPT/M/hedenbergite_hs10.html (192 words)

	Bayerisches Geoinstitut - Annual Report 2001 Stability and thermodynamic mixing properties of ... (Site not responding. Last check: 2007-10-22)
		Complete miscibility between the end–members hedenbergite and petedunnite is observed at pressures greater than 0.1 GPa.
		For pyroxenes with compositions along the hedenbergite-petedunnite join, the equilibrium constant for the above reaction will also depend on the chemical potential of hedenbergite in the solid solution.
		From initial EMF measurements, two Margules parameters have been determined to describe the hedenbergite-petedunnite solid solution.
	www.bgi.uni-bayreuth.de /annual_report/2001/c_35.phtml (285 words)

	Calcic Clinopyroxene
		Diopside and hedenbergite are the most dominant components in most augite.
		The keys to identifying calcic clinopyroxene are normally its high relief, pale green (sometimes clear or light brown) color, middle second-order interference colors, and near 90
		The photos show hedenbergite (Fe-rich calcic clinopyroxene) with microcline.
	www.und.nodak.edu /instruct/mineral/320petrology/opticalmin/cpx.htm (792 words)

	57 Fe nuclear forward scattering of synchrotron radiation in hedenbergite CaFeSi 2 O 6 at hydrostatic pressures up to ...
		Fe nuclear forward scattering (NFS) of synchrotron radiation and the use of diamond anvils with helium as pressure medium allowed study of the electronic state of Fe (super 2+) in the chain silicate hedenbergite CaFeSi
		Characteristics of NFS time spectra were compared with those of conventional Mossbauer spectra.
		Fe in hedenbergite revealed a reversible phase transition between 53 and 68 GPa at room temperature, which is probably a transition from the paramagnetic phase at low pressures to a magnetic phase at high pressures.
	ammin.geoscienceworld.org /cgi/content/abstract/84/3/447 (230 words)

	pyroxene
		A group of chiefly magnesium-iron minerals including diopside, hedenbergite, augite, pigeonite, and many other rock-forming minerals.
		Although members of the group fall into different systems (orthorhombic, monoclinic, and triclinic), they are closely related in form, composition, and structure.
		The mineral group aegirine (Ae), aegirine-augite, clinoenstatite, clinoferrosilite, diopside (Di), donpeacorite, enstatite (En), essenite (Es), ferrosilite (Fs), hedenbergite (Hd), jadeite (Jd), jervisite (Je), johannsenite (Jo), kanoite (Ka), kosmochlor (Ko), natalyite, omphacite, petedunnite (Pe), pigeonite, and spodumene (Sp).
	www.webref.org /geology/p/pyroxene.htm (278 words)

	Volcanic processes III: Case Studies Posters - Volcanology, Geochemistry, Petrology [V]
		To test the application of (U-Th)/He dating in such circumstances, we analyzed volcanic fayalite and hedenbergite crystals containing abundant U-Th-rich inclusions found from the \sim1.6 Ma Otowi (Lower) Member of the Bandelier Tuff in New Mexico.
		We analyzed 36 fayalite (21 non-abraded + 15 abraded) and 13 hedenbergite (7 non-abraded + 6 abraded) phenocrysts, and applied alpha recoil correction assuming uniform intracrystalline distribution of inclusions and parent nuclides in the phenocrysts.
		The fayalite and hedenbergite crystals yield weighted mean ages of 1.62 \pm 0.11 Ma (1 standard deviation) and 1.68 \pm 0.11 Ma, respectively.
	www.agu.org /meetings/fm04/fm04-sessions/fm04_V43E.html (7152 words)

	Hedenbergite: Hedenbergite mineral information and data. (Site not responding. Last check: 2007-10-22)
		Cameron, M., S. Shigeho, C.T. Prewitt & J.J. Papike (1973), High temperature crystal chemistry of acmite, diopside, hedenbergite, jadeite, spodumene and ureyite: American Mineralogist: 58: 594-618.
		Fehr, K.T. and Hobelsberger, B. (1997) Experimentelle Bestimmung der chemischen Potentiale von Hedenbergit in der Mischreihe Hedenbergit-Petedunnit.
		Rothkopf, A.L. and fehr, K.T. (1998) The chemical potential of hedenbergite in hedenbergite-petedunnite solid solution determined by EMF measurements.
	www.mindat.org /min-1842.html (270 words)

	New: Quartz Xls. included with Hedenbergite - Gem stones, crystal, precious gems, fossil, birthstones, etc. at Your ...
		"An aesthetically sculpted quartz "prase" from Seriphos Island, Greece of green Hedenbergite included in lustrous Quartz spears.
		The major crystals are pristine and the three broken periphery crystals certainly do not detract from the beautiful form.
		SUPERB for the size, with dramatic visual appeal - valued around $500.00.
	www.kristauphe-gems.com /viewprod_82506-01.html (146 words)

	EarthRef.org Reference Database (ERR) -- Kandelin & Weidner 1988
		Kandelin, J. and Weidner, D. Elastic properties of hedenbergite.
		In contrast to the orthopyroxenes, the aggregate shear modulus μ of the calcium-bearing clinopyroxenes (diopside and hedenbergite) exhibits no dependence on the amount of iron (Fe) present in the structure, while the ratio K/μ does.
		As a result, the compressional and shear acoustic velocities of the calcium-bearing clinopyroxenes show a smaller dependency on iron content than do the orthopyroxenes.
	earthref.org /cgi-bin/err.cgi?n=37506 (204 words)

	57Fe Mossbauer-effect studies of Ca-rich, Fe-bearing clinopyroxenes: Part II. Magnetic spectra of magnesian ...
		Magnetic spectra of magnesian hedenbergite -- Eeckhout and De Grave 88 (7): 1138 -- American Mineralogist
		The magnetic properties of two natural magnesian hedenbergite
		magnetic structure in hedenbergite can be approximated by a
	ammin.geoscienceworld.org /cgi/content/abstract/88/7/1138 (347 words)

	Hedenbergite (Site not responding. Last check: 2007-10-22)
		Prismatic columns of Hedenbergite with a single attached crystal of Ilvaite.
		OCCURRENCE Hedenbergite forms as a product of metamorphism in rocks rich in iron.
		It is also found in granites, syenites and even as xenoliths in kimberlite.
	www.gc.maricopa.edu /earthsci/imagearchive/hedenbergite.htm (107 words)

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