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Topic: Jarosite

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	Golden Jarosite \| Natural Pigments
		Jarosite is a yellow-colored, hydrous sulfate of iron and potash mineral occurring in sulfurous layers of iron ore. The color of the mineral is amber yellow, but sometimes brownish-yellow.
		Previously not known as a historical pigment, jarosite was recently identified as the yellow pigment in the murals of the temples of Karnak, Egypt.
		Notable occurrences of jarosite include the Jaroso ravine, Sierra Almagrera, Spain; Iron Arrow Mine, Colorado; and Maricopa County, California, U.S. In the former Soviet Union, deposits of jarosite are found in the Achi-Say layers of Kazakhstan and Zhuravlinskogo in the Perm region of Russia.
	www.naturalpigments.com /detail.asp?PRODUCT_ID=430-16B (359 words)

	Iconofile Store: Product: Jarosite
		Jarosite is a rare mineral of hydrous sulfate of iron and potash.
		Jarosite is a hydrous sulfate of iron and potash.
		It is formed during the weathering of sulfurous layers of iron ore. Jarosite is an uncommon mineral, yet it is present in small quantities in almost all layers containing iron sulfides.
	www.iconofile.com /storefront.asp?page=Jarosite (372 words)

	Jarosite - Wikipedia, the free encyclopedia
		Jarosite is often produced as a byproduct during the purification and refining of Zinc.
		Jarosite is an iron analogue of the potassium aluminium sulfate, alunite.
		Jarosite was originally found in 1852 by August Breithaupt in the Barranco del Jaroso in the Sierra Almagrera (near Los Lobos, Cuevas del Almanzora, Almería, Spain).
	en.wikipedia.org /wiki/Jarosite (212 words)

	Discovery Channel :: News :: Study: Mars Water Didn't Last Long
		Madden and her colleagues have used what is known about jarosite on Earth to model the conditions that would allow it to be created and last on Mars.
		Madden and her colleagues simulated what they thought would be a reasonable history for Meridiani Planum jarosite and found that the best explanation for the mineral is a geologically short period of liquid water on Meridiani Planum.
		Both researchers cautioned that all the work on jarosite was more or less speculative because NASA has yet to release the hard data behind their claims of finding the mineral.
	dsc.discovery.com /news/briefs/20041011/marswater.html (500 words)

	Jarosite on Mars
		Beneath the dusty veneer and the rocky crust, jarosite awaited.
		When all the data was in, the APXS had detected large amounts of sulfur and the Mössbauer had detected jarosite, a finding that the late Roger Burns, a geologist at the Massachusetts Institute of Technology, had predicted several years ago.
		The jarosite evidence for the existence of water will not be the last finding the science team makes.
	www.news.cornell.edu /Chronicle/04/3.4.04/jarosite.html (758 words)

	Astrobiology: Device Field Testing
		Jarosite samples were ground and deposited into MOD, sublimed onto the coldfinger coated with fluorescamine, and them MOA sipped samples from that surface to analyze.
		Both pure jarosite and a jarosite scraping were run, as well as a blank.
		Jarosite samples were acid-hydrolyzed and extracted from the soil matrix using a cation exchange column.
	astrobiology.berkeley.edu /device.htm (1002 words)

	Jarosite, schwertmannite, goethite, ferrihydrite and lepidocrocite: the legacy of coal and sulfide ore mining
		Jarosite, schwertmannite, goethite, ferrihydrite and lepidocrocite: the legacy of coal and sulfide ore mining
		Oxalate extraction in the dark, which leads to a complete dissolution of schwertmannite and ferrihydrite (in contrast to goethite and jarosite), enables an estimate of the relative proportions of the former minerals to be made in samples of complex mineralogy.
		Jarosite and goethite precipitated in acid drainage environments are generally relatively well crystallized and can therefore be identified by X-ray diffraction, even when present in subordinate amounts (Figure 2; Table 1).
	www.regional.org.au /au/asssi/supersoil2004/s1/oral/1088_murade.htm (3589 words)

	NMBGMR Staff - Virgil W. Lueth - Hydrothermal "sour gas" jarosite: Ancient and modern acid sulfate mineralization ...
		Hydrothermal jarosite occurs as a coating associated with purple fluorite and as late stage inclusions in blue-green to purple fluorite and quartz.
		Geochronologic and stable isotope studies of supergene jarosite are underway at the copper porphyry deposits in the Organ and Jarilla Mountains on the southeast margin of the rift.
		Jarosite and alunite can be used to define the hydrogeochemical environment of supergene jarosite and alunite mineralization, record the age of paleowater tables, reconstruct climate, geomorphic, and tectonic history of the area.
	geoinfo.nmt.edu /staff/lueth/abstracts/abstracts.html (13268 words)

	A DETAILED COMPARISON OF NATURAL AND SYNTHETIC JAROSITE MINERALS
		Jarosite minerals are sulfates that contain alkali elements and ferric iron.
		Natural jarosites have a narrow range in a and c cell dimensions, and electron microprobe analysis of hydrothermal jarosites detected no cation or anion deficiencies.
		For synthetic jarosites, we found that the common practice of heating to 110°C after synthesis results in minor changes in cell dimensions, significant weight loss (2-5%), and appears to drive off structural waters from protonated hydroxyl sites.
	gsa.confex.com /gsa/2004AM/finalprogram/abstract_78025.htm (370 words)

	'Starfish' shapes at 'worm' tubule ends and/or Spheres
		It may be that the mineral is converting as it is incorporated into the sphere, as it appears that the Jarosite beds almost completely dominate the resource environment of many of the spheres.
		Jarosite may have been the prior material at the soil zones.
		The sphere at the bottom left has the 'starfish' shape attached with the arms extended, and, with a tubule ridge or 'blade' shape and two backswept wings as is common at later jarosite bedding photos.
	www.geocities.com /danajohnson0/photopage5.html (464 words)

	SPACE.com -- The Chemistry of Mars
		This spectrum, taken by Opportunity's Moessbauer spectrometer, shows the presence of an iron-bearing mineral called jarosite in the collection of rocks dubbed 'El Capitan.' El Capitan is located within the rock outcrop that lines the inner edge of the small crater where Opportunity landed.
		Chief among the sulfates found is jarosite, a hydrated iron sulfate detected by Opportunity's Moessbauer spectrometer, a device that scans for iron-bearing minerals.
		Jarosite is typically found in acidic lakes or such as hot springs, she added.
	www.space.com /scienceastronomy/marswater_chemistry_040303.html (763 words)

	The Field Trial of In Situ Leaching at Honeymoon : Extensive Problems
		The formation of jarosite has been noted at uranium mines and tailings dams at Elliot Lake in Ontario, Canada, and was thought to involve the action of bacteria (Ivarson, 1973).
		Dobrowolski (1983c) suggested that the most significant factor in jarosite precipitation during the trial were temporary excursions in the leaching solution pH which produced seed crystals of jarosite and slow precipitation on ore zone gangue minerals at injection pH values higher than 1.8.
		The exact formation of jarosite was considered to arise from either changes in the pH of the leaching solutions or reactions between gangue minerals leading to jarosite growth on quartz or kaolinite.
	www.sea-us.org.au /isl/honeyjaros.html (1138 words)

	ASU Vision Online - Spring 2004 Vol. 7 No. 2
		The finding of the iron-sulfur mineral jarosite by the Opportunity Mars Exploration Rover in the Eagle Crater at Meridiani Planum goes a long way toward confirming what Arizona State University Regents' Professor of Geological Sciences Philip Christensen has long hypothesized - that the Meridiani area was once a shallow lake.
		Data from the MGS's Thermal Emission Spectrometer and Odyssey's THEMIS have allowed Christensen and his colleagues to analyze Mars' geology with great accuracy and to predict many of the findings that the rovers have begun to confirm, including the presence of an ancient lakebed in the otherwise flat landscape of Meridiani.
		The finding of jarosite in the bedrock formation at Eagle is important because the mineral is only known to form in two ways - in the presence of standing water or in volcanic vent environments.
	www.asu.edu /alumni/vision/04v07n02/mars20.html (756 words)

	JAROSITE ON MARS: AN INDICATOR OF WATER-LIMITED CHEMICAL WEATHERING (Site not responding. Last check: 2007-10-12)
		As weathering proceeds, the pH of the fluid increases and leaves the jarosite stability field, resulting in the replacement of jarosite by ferric hydroxide.
		High water:rock ratios (100:1) include jarosite in the final equilibrium assemblage, while the final pH of lower water:rock ratios is outside of the stability field of jarosite.
		This indicates that jarosite will be preserved in the weathering assemblage if (1) a large volume of water reacts completely with a thin veneer of rock or (2) a small volume of water partially weathers a large volume of rock producing a weathering rind.
	gsa.confex.com /gsa/2004AM/finalprogram/abstract_74458.htm (412 words)

	Jarosite, Mars, Spain, Jaroso Hydrothermal System,Astrobiology Planetary Geology, Metallogenymaterial
		Jarosite was first characterized as a new mineral on Earth in Spain in 1852 in the “Jaroso Ravine”, which is the world type locality.
		Jarosite was first characterized as a new mineral on Earth in Spain, in 1852, in the Jaroso ravine (world type locality), located at the iron-rich hydrothermal area of Sierra Almagrera (South Iberian Mediterranean margin).
		We suggest that the multistage hydrothermal system of El Jaroso (Jaroso Hydrothermal System), which is responsible for both the Jaroso ores (especially rich in jarosite) and the Las Herrerias sulfate-rich, shallow-marine laminites, could be exploited as a potential model with important implications for the exploration of Mars.
	tierra.rediris.es /jarosite (1435 words)

	[No title]
		Jarosite was first discovered on Earth in 1852 in ravines in the mountainous coast of southeastern Spain.
		Jarosite may point to the rock's wet history having been in an acidic lake or an acidic hot springs environment.
		Cornell's Steven Squyres shows a jarosite sample from Earth to Rep. Sherwood Boehlert, chair of the House Science Committee, and explains why scientists think the discovery of jarosite on Mars means that planet once had abundant water.
	www.news.cornell.edu /releases/rover/Mars.jarosite.html (981 words)

	Mars rover photos, videos, geology on the surface of Mars
		Of these, jarosite is the most important finding as it can only form in a wet and highly acidic environment.
		Iron sulfide minerals in the volcanic sediments, such as pyrite, could be oxidized to form jarosite; that is, oxygen in the water, especially in the form of sulfur dioxide, could react with the pyrite.
		The jarosite would continue to form as long as the pH was between 1 and 3.
	www.marsgeo.com /Opportunity/Alteration.html (1736 words)

	Mars Exploration Rovers: One Martian Year of in Situ Planetary Geology III Posters - Planetary Sciences [P]
		Jarosite has been identified in layered outcrops in Meridiani by the MER Mossbauer spectrometer [KlingelhÃ¶fer, et al., 2004] and may be present elsewhere on Mars.
		Band assignments for jarosite and alunite spectra are from Bishop and Murad [2005].
		We are in the process of comparing these spectra with the mid-IR and Mossbauer spectra of this jarosite group sample suite in order to perform coordinated analyses for this sulfate group on Mars using the MER and Mars Express datasets.
	www.agu.org /meetings/fm05/fm05-sessions/fm05_P21A.html (6536 words)

	Jarosite - LoveToKnow 1911
		JAROSITE, a rare mineral species consisting of hydrous potassium and aluminium sulphate, and belonging to the group of isomorphous rhombohedral minerals enumerated below: Alunite..
		K2 [Al(OH)216 (S04)4 Jarosite K2 [Fe(OH) 2 ] 6 (S04)4 Natrojarosite Nat [Fe(OH) 2 ] 6 (S04)4 Plumbojarosite Pb [Fe(OH) 2 ] 6 (S04)4 Jarosite usually occurs as drusy incrustations of minute indistinct crystals with a yellowish-brown colour and brilliant lustre.
		This page was last modified 16:34, 3 Sep 2006.
	www.1911encyclopedia.org /Jarosite (175 words)

	ROBERT A. MAHIN (Site not responding. Last check: 2007-10-12)
		The ore minerals consist of germanium-bearing goethite and gallium-bearing jarosite family minerals and iron oxides.
		The presence of other primary sulfate minerals, the lack of any local source of potassium and the absence of samples clearly indicating a secondary weathering relationship of sulfide to jarosite suggests that some of the jarosite may be hydrothermal in origin.
		Thermodynamic stability of jarosite permit the formation of hypogene jarosite for the postulated conditions of Apex hydrothermal mineralization.
	www.mines.utah.edu /~wmep/Petersenvit/students/mahin.html (550 words)

	Research shows liquid water may have been on Mars briefly
		NASA's Mars Rover Opportunity recently found the mineral jarosite and possibly gypsum on Mars' surface, further adding to the speculation that water existed there in the past because those minerals "generally form in a wet environment," according to a Nature news release.
		According to the press release from Nature, "On Earth, jarosite forms in acid mine drainage environments as sulphide minerals oxidize -- it has been found in Idaho or California, for example.
		The reason, Elwood Madden and Rimstidt said, is that jarosite forms when only a small amount of reaction has occurred and completely decomposes if more water is available.
	www.eurekalert.org /pub_releases/2004-10/vt-rsl101104.php (521 words)

	Pasminco to Cease Disposal of Jarosite at Sea Media Release October 29,1997
		PASMINCO TO CEASE DISPOSAL OF JAROSITE AT SEA
		Pasminco Australia Ltd was granted a special permit to dispose of jarosite waste at sea until 31 December 1997 to enable the company time to develop the co-treatment process.
		The study did not find any evidence that the disposal of jarosite had an adverse impact on the marine environment.
	www.deh.gov.au /minister/env/97/mr29oct297.html (318 words)

	JAROSITE (Potassium Iron Sulfate Hydroxide)
		Jarosite is isostructural with natrojarosite which means that they have the same crystal structure but different chemistries.
		In this case, jarosite contains potassium instead of natrojarosite's sodium (natro is derived from the Latin for sodium, natrium, from where sodium gets its symbol, Na).
		Crystals of jarosite however do not form prismatic crystals like those of the typical tourmaline mineral.
	www.galleries.com /minerals/SULFATES/JAROSITE/jarosite.htm (258 words)

	Alunite in the Pascua-Lama High-Sulfidation Deposit: Constraints on Alteration and Ore Deposition Using Stable Isotope ...
		Also indicated is the approximate minimum age for preore advanced argillic alteration (AA1), based on age dates for advanced argillic alteration in the Frontera and Lama areas from Bissig et al.
		Jarosite is present as a late mineral in association with advanced
		(1992), and the supergene jarosite OH zone (SJOZ) and supergene jarosite sulfate field (SJSF) as described in Rye and Alpers (1997).
	econgeol.geoscienceworld.org /cgi/content/full/100/1/131 (6668 words)

	NMBGMR -
		Jarosite, a potassium iron sulfate, is a member of the alunite group.
		By determining the isotopic characteristics of jarosite, one can use these characteristics to infer water sources, sulfur sources, and paleoclimate conditions during the formation of the mineral.
		We are currently applyingthese principles to the formation of barite-fluorite deposits in the Rio Grande rift of New Mexico and the weathering of ore deposits on the flanks of the rift.
	geoinfo.nmt.edu /staff/lueth/research.html (3629 words)

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