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- Alunite abstract "Alunite is a hydrated aluminium potassium, sulfate mineral, formula KAl3(SO4)2(OH)6. It was first observed in the 15th century at Tolfa, near Rome, where it is mined for the manufacture of alum. First called aluminilite by J.C. Delamétherie in 1797, this name was contracted by François Beudant in 1824 to alunite.Alunite crystals morphologically are rhombohedra with interfacial angles of 90° 50', causing them to resemble cubes. Crystal symmetry is trigonal. Minute glistening crystals have also been found loose in cavities in altered rhyolite. Alunite varies in color from white to yellow gray. The hardness is 4 and the specific gravity is between 2.6 and 2.8. It is insoluble in water or weak acids, but soluble in sulfuric acid.Sodium can substitute for potassium in the mineral, and when the sodium content is high, is called natroalunite.Alunite is an analog of Jarosite, where aluminium replaces Fe3+. Alunite occurs as a secondary mineral on iron sulfate ores.Alunite occurs as veins and replacement masses in trachyte, rhyolite, and similar potassium rich volcanic rocks. It is formed by the action of sulfuric acid bearing solutions on these rocks during the oxidation and leaching of metal sulfide deposits. Alunite also is found near volcanic fumaroles. The white, finely granular masses closely resemble finely granular limestone, dolomite, anhydrite, and magnesite in appearance. The more compact kinds from Hungary are so hard and tough that they have been used for millstones.Historically extensive deposits were mined in Tuscany and Hungary, and at Bulahdelah, New South Wales, Australia. It is currently mined at Tolfa, Italy. In the United States it is found in the San Juan district of Colorado; Goldfield, Nevada; the ghost town of Alunite, Utah near Marysvale; and Red Mountain near Patagonia, Arizona. The Arizona occurrence lies appropriately above a canyon named Alum Gulch. Alunite is mined as an ore of both potassium and aluminium at Marysvale. Some of the ore deposits were located by airborne and satellite multispectral imaging.".
- Alunite thumbnail Alunite_-_USGS_Mineral_Specimens_015.jpg?width=300.
- Alunite wikiPageExternalLink alunite.htm.
- Alunite wikiPageID "1198013".
- Alunite wikiPageRevisionID "596685031".
- Alunite birefringence "δ = 0.020".
- Alunite caption "Alunite from Utah - USGS".
- Alunite category Sulfate_minerals.
- Alunite cleavage "On {0001}, perfect".
- Alunite color "Yellow, red, to reddish brown, colorless if pure; may be white, pale shades of gray,".
- Alunite diaphaneity "Transparent to translucent".
- Alunite formula "KAl326".
- Alunite fracture "Conchoidal".
- Alunite gravity "2.6".
- Alunite habit "fibrous to columnar, porcelaneous, commonly granular to dense massive".
- Alunite hasPhotoCollection Alunite.
- Alunite luster "Vitreous, somewhat pearly on {0001} for crystals, earthy if massive".
- Alunite mohs "3.5".
- Alunite name "Alunite".
- Alunite opticalprop "Uniaxial".
- Alunite other "Strongly pyroelectric".
- Alunite refractive "nω = 1.572 nε = 1.592".
- Alunite streak "White".
- Alunite strunz "7".
- Alunite symmetry "180.0".
- Alunite system "Trigonal".
- Alunite tenacity "Brittle".
- Alunite unitCell "a = 6.98 Å, c = 17.32 Å; Z=3".
- Alunite subject Category:Aluminium_minerals.
- Alunite subject Category:Alunite.
- Alunite subject Category:Alunite_group.
- Alunite subject Category:Potassium_minerals.
- Alunite subject Category:Sulfate_minerals.
- Alunite subject Category:Trigonal_minerals.
- Alunite type Abstraction100002137.
- Alunite type AluminiumMinerals.
- Alunite type Material114580897.
- Alunite type Matter100020827.
- Alunite type Mineral114662574.
- Alunite type Part113809207.
- Alunite type PhysicalEntity100001930.
- Alunite type PotassiumMinerals.
- Alunite type Relation100031921.
- Alunite type Substance100019613.
- Alunite type SulfateMinerals.
- Alunite type TrigonalMinerals.
- Alunite type ChemicalSubstance.
- Alunite type Mineral.
- Alunite type ChemicalObject.
- Alunite type Thing.
- Alunite comment "Alunite is a hydrated aluminium potassium, sulfate mineral, formula KAl3(SO4)2(OH)6. It was first observed in the 15th century at Tolfa, near Rome, where it is mined for the manufacture of alum. First called aluminilite by J.C. Delamétherie in 1797, this name was contracted by François Beudant in 1824 to alunite.Alunite crystals morphologically are rhombohedra with interfacial angles of 90° 50', causing them to resemble cubes. Crystal symmetry is trigonal.".
- Alunite label "Aluniet".
- Alunite label "Alunit".
- Alunite label "Alunita".
- Alunite label "Alunita".
- Alunite label "Alunite".
- Alunite label "Alunite".
- Alunite label "Alunite".
- Alunite label "Ałunit".
- Alunite label "Алунит".
- Alunite label "明礬石".
- Alunite label "明礬石".
- Alunite sameAs Alunit.
- Alunite sameAs Alunit.
- Alunite sameAs Alunita.
- Alunite sameAs Alunita.
- Alunite sameAs Alunite.
- Alunite sameAs Alunite.
- Alunite sameAs 明礬石.
- Alunite sameAs Aluniet.
- Alunite sameAs Ałunit.
- Alunite sameAs Alunita.
- Alunite sameAs m.04gkmn.
- Alunite sameAs Q338106.
- Alunite sameAs Q338106.
- Alunite sameAs Alunite.
- Alunite wasDerivedFrom Alunite?oldid=596685031.
- Alunite depiction Alunite_-_USGS_Mineral_Specimens_015.jpg.
- Alunite isPrimaryTopicOf Alunite.
- Alunite name "Alunite".