Gelosaite, BiMo6+(2–5x)Mo5+6xO7(OH)·H2O (0 ≤ x ≤ 0.4), a new mineral from Su Senargiu (CA), Sardinia, Italy, and a second occurrence from Kingsgate, New England, Australia
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Abstract
Gelosaite, BiMo6+(2-5x)Mo5+6xO7(OH)·H2O (0 ≤ x ≤ 0.4), occurs at the type locality in quartz veins hosted by granitic rocks at Su Senargiu, near Sarroch, Sardegna, Italy. The name is in memory of Mario Gelosa (1947-2006) who first found the mineral. The mineral also occurs in the oxidized zones of the Old 25 and Wolfram pipes at Kingsgate, New South Wales, Australia. Both the mineral and its name have been approved by the IMA CNMNC (IMA 2009-022). Gelosaite occurs as yellow, yellowish green, and pale blue, prismatic crystals with a white streak. It is transparent with an adamantine luster, non-fluorescent, brittle, and has a conchoidal fracture. Mohs hardness is ~3. The mineral is monoclinic, space group P21/n, with a = 5.8505(4), b = 9.0421(6), c = 13.917(1) Å, β = 100.42(1)°, V = 724.1(1) Å3, Z = 4 (yellow Su Senargiu crystal); a = 5.8570(5), b = 9.0517(8), c = 13.992(1) Å, β = 100.44(1)°, V = 729.5(1) Å3, Z = 4 (pale blue Su Senargiu crystal); a = 5.837(3), b = 9.040(5), c = 13.904(7) Å, β = 100.64(1)°, V = 721.0(6) Å3, Z = 4 (blue Kingsgate crystal). Strongest lines in the powder X-ray pattern [d (Å)(Irel)] are 4.83(100), 3.41(21), 3.30(25), 3.015(50), 2.755(60), 2.080(50), 1.688(20), and 1.509(30). The single-crystal X-ray structure of gelosaite was determined for three separate crystals, two from Su Senargiu and one from Kingsgate. The structure consists of layers of distorted MoO6 octahedra, plus minor amounts of interstitial Mo ions, and layers made up of eight-coordinate Bi3+ ions, plus further small amounts of interstitial Mo ions. The theoretical Mo(VI) end-member has the stoichiometry BiMo6+2O7(OH)·H2O and excess Mo in the interstices requires increasing amounts of Mo(V) to be present. The theoretical Mo(V) end-member has the stoichiometry BiMo5+2.4O7(OH)·H2O
© 2015 by Walter de Gruyter Berlin/Boston
Articles in the same Issue
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Articles in the same Issue
- Paulscherrerite from the Number 2 Workings, Mount Painter Inlier, Northern Flinders Ranges, South Australia: “Dehydrated schoepite” is a mineral after all
- Atomistic investigation of the pyrophyllitic substitution and implications on clay stability
- Application of the two-feldspar geothermometer to ultrahigh-temperature (UHT) rocks in the Khondalite belt, North China craton and its implications
- Wüstite in a hydrothermal silver-lead-zinc vein, Lucky Friday mine, Coeur d’Alene mining district, U.S.A.
- Gelosaite, BiMo6+(2–5x)Mo5+6xO7(OH)·H2O (0 ≤ x ≤ 0.4), a new mineral from Su Senargiu (CA), Sardinia, Italy, and a second occurrence from Kingsgate, New England, Australia
- Improved electron probe microanalysis of trace elements in quartz
- Ultra-high residual compressive stress (>2 GPa) in a very small volume (<1 μm3) of indented quartz
- Transmission electron microscopy investigation of Ag-free lillianite and heyrovskýite from Vulcano, Aeolian Islands, Italy
- Combined inelastic neutron scattering and solid-state density functional theory study of dynamics of hydrogen atoms in muscovite 2M1
- Contact metamorphism of a Cretaceous accretionary prism by the 14 Ma Okueyama granite, a single post-kinematic pluton in Central Kyushu, Japan: SVD analysis of metamorphic reactions and thermal release
- Origin of crosscutting dissolution surfaces in magmatic plagioclase
- Néel transition in (Mg,Fe)O: A possible change of magnetic structure
- Extreme channelization of fluid and the problem of element mobility during Barrovian metamorphism
- The high-temperature P21/m → C2/m phase transitions in synthetic amphiboles along the richterite–(BMg)–richterite join
- The crystal structure of barite, BaSO4, at high pressure
- Thermal decomposition of brushite, CaHPO4·2H2O to monetite CaHPO4 and the formation of an amorphous phase
- Rhombic-shaped nanodomains in columbite driven by contrasting cation order
- High-pressure structural evolution and equation of state of analbite
- In-situ dehydration studies of fully K-, Rb-, and Cs-exchanged natrolites
- The crystal structures and Raman spectra of aravaipaite and calcioaravaipaite
- Temperature dependence of the Fe2+ Mössbauer parameters in triphylite (LiFePO4)
- Synthesis and characterization of françoisite-(Nd): Nd[(UO2)3O(OH)(PO4)2]·6H2O
- Fluorphosphohedyphane, Ca2Pb3(PO4)3F, the first apatite supergroup mineral with essential Pb and F
- A new mineral with an olivine structure and pyroxene composition in the shock-induced melt veins of Tenham L6 chondrite
- The WURM project—a freely available web-based repository of computed physical data for minerals
- Acid production by FeSO4·nH2O dissolution: Comment
- Letter. Crystal chemistry of sodium in the Earth’s interior: The structure of Na2MgSi5O12 synthesized at 17.5 GPa and 1700 °C
- Letter. In-situ infrared spectra of OH in olivine to 1100°C
