Alunite KAl3(SO4 2(OH)6
Mineral Group: Alunite group. Occurrence: Formed between 15 C and 400 C by the action of sulfate, which may be generated from pyrite or solfataric action, on aluminous rocks, commonly accompanied by kaolinitization and silicification. Association: Kaolinite, halloysite, diaspore, pyrite, gypsum, quartz.
Alunite | Mineral, Description, Uses, & Facts | Britannica
Alunite, a widespread rock-forming sulfate mineral that occupies pockets or seams in volcanic rocks such as rhyolites, trachytes, …
Alunite, natroalunite and hydrated halloysite in carlsbad …
Slaughter Canyon Cave where alunite has not yet been found is . located at ~1380 m, yielding an estimated timing of speleogen-esis of 7 Ma from our curve (Fig. 6).
Alunite Nevada | Southwest Explorers
Alunite Nevada Alunite Nevada Overview. Named for the alunite in the district, Alunite was a mining district at the southeast end of Las Vegas in Clark County, Nevada, at a low gap known as Railroad Pass, was discovered in 1908 and was named for the alunite in the district.. Also known as the Flatiron, Glonite Mining District, Railroad …
Alunite
Alunite is one of the minerals of the jarosite group and contains approximately 50% SiO 2. Characteristics of alunite can be found in the review by Dill (2001) . However, untreated …
Alunite
Currently found at Tolfa, Italy. In the United States it is found in the San Juan district of Colorado; Goldfield, Nevada; Marysvale, Utah; and Red Mountain in Patagonia, Arizona. …
Mineralogical and geochemical constraints on the …
The Geochemistry of alunites can be used to explore high potential ore deposits. A significant association of alunite supergroup minerals commonly associated with quartz …
Alunite spectral features and mineral chemistry of the …
Lithocaps are composed of silicic and advanced argillic altered rocks, and represent an important target for porphyry-epithermal Cu-Au exploration. Previous studies showed that integrating alunite spectral and composition with lithocap whole-rock geochemistry can effectively aid exploration for concealed Cu-Au mineralization. The …
Alunite Definition & Meaning
alunite: [noun] a mineral that consists of a hydrous potassium aluminum sulfate and occurs in massive form or in rhombohedral crystals.
DF2014:Alunite
DF2014:Alunite. This article is about an older version of DF. Alunite is a magma-safe stone found in igneous extrusive and kaolinite stone layers in clusters. Aside from its potential applicability in controlling magma, alunite is entirely unremarkable and has the same value as every other common stone.
Extraction kinetics of alunite in sulfuric acid and hydrochloric acid
The activation energies of the processes were found to be 19.1 and 18.5 kJ/mol for sulfuric acid and hydrochloric acid, respectively. ... It was found that the alunite. must be calcined at 650 8 C ...
Occurrences of alunite, pyrophyllite, and clays in the Cerro …
Other zones were discovered north and south of this belt and still others were found circumventing the San Lorenzo batholith. The most abundant minerals of the mineralized zone can be exploited for economic utilization in Puerto Rico. Alunite can be utilized in the manufacture of aluminum sulfate for water purification.
Alunite
Alunite is a magma-safe stone found in igneous extrusive and kaolinite stone layers in clusters. Aside from its potential applicability in controlling magma, alunite is entirely unremarkable and has the same value as every other common stone.
Alunite supergroup minerals from advanced argillic …
The study of alunite supergroup minerals (alunite, jarosite, and aluminum-phosphate-sulfate (APS) minerals) that are part of the acidic alteration assemblages, can help to better constrain the hydrothermal and supergene alteration events, as these minerals record information about the precipitation environment and the nature and …
Jarosite and Alunite in Ancient Terrestrial Sedimentary Rocks
On Earth, large deposits of alunite and jarosite are most commonly found in volcanic acid-sulfate systems—where they usually precipitate by alteration of feldspar and other silicates—or in acid mine drainages such as Rio Tinto, where they precipitate by oxidation of pyrite and other metal sulfide minerals in massive sulfide deposits [20,31 ...
Alunite
Plumbojarosite is a Pb-containing jarosite, an iron sulfate hydroxide member in the alunite supergroup. The alunite supergroup consists of more than 40 mineral species with the …
Alunite Supergroup: Mineral information, data and localities.
ID Species Reference Link Year Locality Pressure (GPa) Temp (K) 0000016: Alunite: Hendricks S B (1937) The crystal structures of alunite and the jarosites American Mineralogist 22 773-784 1937: 0: 293: 0000037: Alunite: Pabst A (1947) Some computations on svanbergite, woodhouseite and alunite American Mineralogist 32 16-30 …
Age and Origin of Carlsbad Cavern and Related Caves from
Alunite, like the gypsum that formed during cave genesis, is found only in cave areas that have been protected from flood, seepage, and drip waters since the caves formed. Alunite crystals are euhedral and generally range from 1 to 5 μm across (Fig.2C), although one sample contained crystals as large as 20 μm. We purified and separated ...
Alunitele. Tot ce trebuie sa stii despre alunite/nevi
Daca exista expuneri la soare intense /prelungite. Daca alunitele sunt in numar mare. Majoritatea alunitelor sunt benigne la evaluarea dermatoscopica, urmand sa fie reevaluate periodic (cand este necesar ). Alunitele care prezinta suspiciune pentru melanom se recomanda a fi excizate chirurgical si examinate histopatologic.
Jarosites: Formation, Structure, Reactivity and Environmental
Jarosite, beudantite and alunite are members of the alunite supergroup. Minerals like those have been detected in different environments on Earth. These jarosite-type compounds are common in acid rock drainage environments and acid sulfate soils, resulting from the weathering of sulfide ores; they are also present in bioleaching …
Get to Know the 7 Delicate Sulfate Minerals
Alunite is a hydrous aluminum sulfate, KAl 3 (SO 4) 2 (OH) 6, from which alum is manufactured. Alunite is also called alumite. It has a Mohs hardness of 3.5 to 4 and coloring in white to flesh-red. Usually, it's found in the massive habit rather than as crystalline veins.
Mineralogy, textures, and whole-rock geochemistry of
Alunite at Hugo Dummett and Central formed from a vapor condensate, that underwent the SO 2 disproportionation reaction (4SO 2 + 4H 2 O = 2H 2 SO 4 + 2H 2 S) at temperatures <450 C, and formed acidic fluids at temperatures below 300 C. The temperature of formation of alunite is estimated from the isotope data to be about 260°C.
Aluminite: Mineral information, data and localities.
Found as concretionary deposits in Tertiary to Quaternary clays, marls, and lignites, formed by the action of sulfate solutions derived from the decay of pyrite or marcasite on aluminous silicates. Typically in clays or lignites, formed by the reaction of sulfate-bearing solutions from the decomposition of marcasite or pyrite at moderate ...
Alunite and natroalunite tell a story-the age and origin …
Alunite was first reported in the Guadalupe Mountains caves in Lechuguilla Cave (Palmer and Palmer, 1992), and alunite and natroalunite were reported in Carlsbad Cavern soon after that (Polyak and Güven, 1996). Since then alunite in datable quanti-ties has been found in three additional caves: Endless, Cotton-
Leaching kinetics and mechanism of alunite from alunite …
According to XRD analysis for alunite tailings, as shown in Fig. 2, it is found that alunite tailings mainly contain alunite, kaolinite, dickite and quartz. Therefore, it is deduced that there exist three reactions between alunite tailings and potassium hydroxide, as shown in Eqs.
ALUNITE
Ouster alunite properties was made on November 2 by Hoyt S. Gale. The general review of the geology of the Tushar Range given on pages 12-38 is the work of B. S. Butler. ... edly located for small metalliferous values said to be found in the siliceous wall rock of the vein, it was not until 1910 that the true nature of the spar was discovered. ...
What Is Alum and How Is It Used?
Usually, when you hear about alum it is in reference to potassium alum, which is the hydrated form of potassium aluminum sulfate and has the chemical formula KAl(SO 4) 2 ·12H 2 O. However, any of the compounds with the empirical formula AB(SO 4) 2 ·12H 2 O are considered to be an alum. Sometimes alum is seen in its crystalline form, although …
Arsenic immobilization as alunite-type phases: The …
AsO 4-for-SO 4 substitution in alunite (KAl 3 (SO 4) 2 (OH) 6) and hydronium alunite ((H 3 O)Al 3 (SO 4) 2 (OH) 6) has been investigated by hydrothermal precipitation at 200 °C. Arsenical alunite presented a good precipitation yield and a significant AsO 4 substitution (up to 15% molar). The degree of arsenate substitution …
Mineralogy and a New Fertility Index of Alunite in the …
Alunite is used as a representative mineral for indicating deposits in lithocaps, and lithocaps are generally related to the porphyry–(high-sulfidation) epithermal mineralization system. The study of alunite is of theoretical and exploration significance for prospecting potential underlying porphyry and epithermal deposits. Studies on alunite …
The Association of Alunite with Gold in the Goldfield …
Alunite is found also on some of islands of the Grecian Archi- pelago, near Muszay in Hungary, on Mount Dore in France and in a few other localities in Europe, as well as with the opaI of Queretaro, in Mexico. In the United States it has been described in the Rosita Hills, a on Calico Peak near Rico, 4 in the NationaI ...
