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Topic: Pyrolusite

	Pyrolusite - LoveToKnow 1911
		PYROLUSITE, a mineral consisting essentially of manganese dioxide (Mn0 2), of importance as an ore of manganese.
		Supposed crystals of pyrolusite have been proved to be pseudomorphs after manganite; in fact the mineral often results by the dehydration and oxidation of manganite (Mn 2 0 3.H 2 O), and for this reason it frequently contains a little water.
		As a colouring material, it is used in calico printing and dyeing; for imparting violet, amber and fl colours to glass, pottery and bricks; and in the manufacture of green and violet paints.
	www.1911encyclopedia.org /P/PY/PYROLUSITE.htm (397 words)

	Mineral Brown Black (Pyrolusite) \| Natural Pigments (Site not responding. Last check: 2007-11-04)
		Pyrolusite is the most common manganese mineral and is an important ore. Its color is variable from iron-fl to bluish fl to steel gray.
		Pyrolusite is a manganese compound and is considered to be among the most permanent pigments in the artist's palette.
		Pyrolusite is moderately toxic and care should be used in handling the dry powder pigment so as not to inhale the dust.
	www.naturalpigments.com /detail.asp?PRODUCT_ID=480-20S (397 words)

	pyrolusite.htm (Site not responding. Last check: 2007-11-04)
		Pyrolusite and other manganese minerals are a component of the "manganese dendrites" that are ubiquitous along joint surface in much of the bedrock of the state.
		Pyrolusite is associated and intergrown with iron oxides such as hematite and goethite and other manganese oxides such as romanechite.
		IOWA COUNTY: Pyrolusite and other manganese minerals are wide-spread as "fl ocher" along joints in the oxidized zones of the many Upper Mississippi Valley zinc-lead deposits in the county.
	www.uwrf.edu /~wc01/pyrolusite.htm (291 words)

	Rock and Gem Article
		Pyrolusite, or manganese dioxide, the primary ore of manganese and the most common manganese mineral, occurs in fl or dark bluish-gray powdery, granular and fibrous masses and as dendritic crusts.
		Pyrolusite is a secondary mineral that, along with psilomelane and wad, sometimes forms replacement deposits in limestone.
		Metallurgical tests showed that the pyrolusite could be used directly that is, without any prior milling, concentration or refining-as both a deoxidizing flux and as a source of alloying manganese.
	www.salida.com /lostmine/html/rock_gem_article.htm (2394 words)

	Pyrolusite (Site not responding. Last check: 2007-11-04)
		These samples of pyrolusite are displayed in the Smithsonian Museum of Natural History.
		Pyrolusite is an oxide mineral of manganese with the composition MnO
		This sample of pyrolusite is from Boston Hill Mine, Silver City, New Mexico.
	hyperphysics.phy-astr.gsu.edu /hbase/minerals/pyrolusite.html (50 words)

	Minerals
		Mohs hardness is 2 to 6 (masses) or 6 to 6.5 (crystals), luster is metallic to dull, streak is fl or bluish fl, and specific gravity is 4.75 (masses) or 5.01 (crystals).
		Pyrolusite is brown fl in color and often somewhat magnetic; the name manganese is a corrupted form of the Latin word for a form of magnetic stone, magnesia.
		Pyrolusite is used extensively in the electrodes of dry batteries, where it absorbs liberated hydrogen gas and then chemically bonds it.
	www.mine-engineer.com /mining/mineral/mineral6.htm (400 words)

	PYROLUSITE (Manganese Oxide)
		Pyrolusite is the most common manganese mineral and is an important ore. Manganese is a strategically valuable metal since it is an essential ingredient in steel and other alloys.
		The mining term "wad" is used to indicate ores that are a mixture of several manganese oxides such as pyrolusite, psilomelane and others that are difficult to distinguish.
		Pyrolusite has some interesting habits dispite its common occurrence as dull, sooty, fl masses and/or earthy forms.
	mineral.galleries.com /minerals/oxides/pyrolusi/pyrolusi.htm (479 words)

	Pyrolusite - Wikipedia, the free encyclopedia
		Pyrolusite is a mineral consisting essentially of manganese dioxide (MnO
		Pyrolusite and rhodochrosite are among the most common manganese minerals.
		Pyrolusite is extensively used for the manufacture of spiegeleisen and ferro-manganese and of various alloys such as manganese-bronze.
	en.wikipedia.org /wiki/Pyrolusite (243 words)

	Armadillo Aerospace - News Archive
		Pyrolusite is used in various water filtration and treatment processes
		AWI was willing to sell us 50 pounds of the pure pyrolusite (without the quartz sand), and it was very cheap, only $3/lb, but it was finer grain than we would have preferred -- about 20 mesh.
		There is a patent for a gas generator using mixed peroxide / fuel and pyrolusite catalyst with a single layer of catalyst that they claim reaches full temperature operation if it is preheated to 600C, so, even though we were dubious, we tried that first.
	www.armadilloaerospace.com /n.x/Armadillo/Home/News?news_id=296 (2416 words)

	Psilomelane, rock, crystal, mineral, gem stone, birth stones - mineralgallery
		, although not as common as pyrolusite, is still an important ore of manganese.
		The difficulty in distinguishing romanechite from other barium manganese oxides, is that they are probably mixed together in the same specimen,that is why the name psilomelane is still in use.
		Psilomelane also forms tufts of hair-like aggregates that are similar to those produced by pyrolusite.
	www.mineralgallery.co.za /psilomelane.htm (300 words)

	Psilomelane (Site not responding. Last check: 2007-11-04)
		Psilomelane is often banded with gray pyrolusite and the alternating layers make an attractive polished stone with bands of metallic gray and submetallic fl.
		However, the difference in luster between the two minerals is usually sufficient to distinguish them.
		Pyrolusite is also soft enough to leave marks on fingers and paper.
	www.penoir.com /stones/Psil.html (361 words)

	Pyrolusite (Site not responding. Last check: 2007-11-04)
		CRYSTAL GROWTH AND HABITS Pyrolusite forms prismatic crystals that have a square cross section and are usually fibrous.
		OCCURRENCE Pyrolusite is found in the oxidized zone of manganese deposits.
		NAME From the Greek "pyro" for fire and "louein" to wash. It was used to remove "wash-out" the greenish color in glass caused by iron.
	www.gc.maricopa.edu /earthsci/imagearchive/pyrolusite.htm (138 words)

	Mineral description : Pyrolusite (Site not responding. Last check: 2007-11-04)
		Pyrolusite is a secondary mineral in manganese occurances.
		Pyrolusite is a less common manganese ore in Sweden.
		If you have some questions, suggestions or comments you are welcome to write me a line or two.
	www.geology.neab.net /minerals/pyrolusi.htm (46 words)

	pyrolusite - OneLook Dictionary Search
		Tip: Click on the first link on a line below to go directly to a page where "pyrolusite" is defined.
		PYROLUSITE : 1911 edition of the Encyclopedia Britannica [home, info]
		Pyrolusite : Eric Weisstein's World of Chemistry [home, info]
	www.onelook.com /?w=pyrolusite (165 words)

	Pyrolusite: Pyrolusite mineral information and data. (Site not responding. Last check: 2007-11-04)
		While it has been usual practice to assume that if it's dendritic and it's an Mn-oxide, it must be pyrolusite, it usually isn't so...
		NOTE: Most supposed specimens of pyrolusite in dendritic form turn out to be other Mn-oxide species upon being examined in the proper laboratory setting for characterizing these difficult to identify minerals.
		Crystals are uncommon, either long or short prismatic parallel to [001] or equant; more typically found as earthy powder or fibrous aggregates as crusts on rocks; often dendritic on fracture surfaces or enclosed in chalcedony ("moss agate"), sometimes as botryoidal aggregates, more rarely as druzes of microscopic crystals.
	www.mindat.org /min-3318.html (553 words)

	Oxidation of Chromium(III) to (VI) by Manganese Oxides -- Kim et al. 66 (1): 306 -- Soil Science Society of America ...
		X-ray diffraction patterns of the coarse clay-size (0.2–2 µm) Mn oxides (synthetic pyrolusite and natural lithiophorite, todorokite, and birnessite).
		Transmission electron micrographs of (a) todorokite (b) birnessite, (c) lithiophorite, and (d) pyrolusite.
		The four Mn oxides are abbreviated as follows: todorokite (T), birnessite (B), lithiophorite (L), and pyrolusite (P).
	soil.scijournals.org /cgi/content/full/66/1/306 (4331 words)

	Watershed Restoration and Abandoned Mine Lands: Kimble Creek, Abandonded Mine Lands, Superfund, US EPA
		Abstract: In 2002, a pilot project was initiated in the Ironton Ranger District to assess the use of a pyrolusite system to treat acid mine drainage issuing to Kimble Creek.
		The microbes were injected into pyrolusite beds (gravel-filled cells) through which the acid mine drainage flows.
		Prior to construction of the pyrolusite beds, the pH of the Kimble Creek acid mine drainage source ranged from 2.2 to 2.8.
	www.epa.gov /oerrpage/superfund/programs/aml/tech/news/kimble.htm (267 words)

	Highbeam Encyclopedia - Search Results for pyrolusite (Site not responding. Last check: 2007-11-04)
		pyrolusite PYROLUSITE [pyrolusite], naturally occurring manganese dioxide, MnO 2, a fl mineral that crystallizes in the tetragonal system but is usually found in earthy or massive deposits.
		Find newspaper and magazine articles plus images and maps related to "pyrolusite" at HighBeam.
		More information is at your fingertips at HighBeam Research:
	www.encyclopedia.com /SearchResults.aspx?Q=pyrolusite (206 words)

	Pyrolusite Mineral Data
		Standardized Intensity (100%) Reflection Spectra of Pyrolusite in Air
		Calculated Relative Intensity Colors of Pyrolusite in Air
		Print or Cut-and-Paste your Pyrolusite Specimen Label here :
	webmineral.com /data/Pyrolusite.shtml (240 words)

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