Footemineite, the Mn-analog of atencioite, from the Foote mine, Kings Mountain, Cleveland County, North Carolina, U.S.A., and its relationship with other roscherite-group minerals
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Daniel Atencio
,
Paulo A. Matioli
Abstract
Footemineite, ideally Ca2Mn2+□Mn22+Mn22+Be4(PO4)6(OH)4·6H2O, triclinic, is a new member of the roscherite group. It occurs on thin fractures crossing quartz-microcline-spodumene pegmatite at the Foote mine, Kings Mountain, Cleveland County, North Carolina, U.S.A. Associated minerals are albite, analcime, eosphorite, siderite/rhodochrosite, fairfieldite, fluorapatite, quartz, milarite, and pyrite. Footemineite forms prismatic to bladed generally rough to barrel-shaped crystals up to about 1.5 mm long and 1 mm in diameter. Its color is yellow, the streak is white, and the luster is vitreous to slightly pearly. Footemineite is transparent and non-fluorescent. Twinning is simple, by reflection, with twin boundaries across the length of the crystals. Cleavage is good on {01̅1} and {100}. Density (calc.) is 2.873 g/cm3. Footemineite is biaxial (-), nα = 1.620(2), nβ = 1.627(2), nγ = 1.634(2) (white light). 2Vobs = 80°, 2Vcalc = 89.6°. Orientation: X ^ b ~ 12°, Y ^ c ~ 15°, Z ^ a ~ 15°. Elongation direction is c, dispersion: r > v or r < v, weak. Pleochroism: β (brownish yellow) > α = γ (yellow). Mössbauer and IR spectra are given. The chemical composition is (EDS mode electron microprobe, Li and Be by ICP-OES, Fe3+:Fe2+ by Mössbauer, H2O by TG data, wt%): Li2O 0.23, BeO 9.54, CaO 9.43, SrO 0.23, BaO 0.24, MgO 0.18, MnO 26.16, FeO 2.77, Fe2O3 0.62, Al2O3 0.14, P2O5 36.58, SiO2 0.42, H2O 13.1, total 99.64. The empirical formula is (Ca1.89Sr0.03Ba0.02)Σ1.94(Mn2+0.90□0.10)Σ1.00(□0.78Li0.17Mg0.05)Σ1.00(Mn2+3.25Fe2+0.43Fe3+0.09 Al0.03)Σ3.80Be4.30(P5.81Si0.08O24)[(OH)3.64(H2O)0.36]Σ4.00·6.00H2O. The strongest reflection peaks of the powder diffraction pattern [d, Å (I, %) (hkl)] are 9.575 (53) (010), 5.998 (100) (01̅1), 4.848 (26) (021), 3.192 (44) (210), 3.003 (14) (02̅2), 2.803 (38) (1̅03), 2.650 (29) (2̅02), 2.424 (14) (231). Single-crystal unit-cell parameters are a = 6.788(2), b = 9.972(3), c = 10.014(2) Å, α = 73.84(2), β = 85.34(2), γ = 87.44(2)°; V = 648.74 Å3, Z = 1. The space group is P1̅. Crystal structure was refined to R = 0.0347 with 1273 independent reflections (F > 2σ). Footemineite is dimorphous with roscherite, and isostructural with atencioite. It is identical with the mineral from Foote mine described as “triclinic roscherite.” The name is for the Foote mine, type locality for this and several other minerals.
© 2015 by Walter de Gruyter Berlin/Boston
Articles in the same Issue
- Footemineite, the Mn-analog of atencioite, from the Foote mine, Kings Mountain, Cleveland County, North Carolina, U.S.A., and its relationship with other roscherite-group minerals
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- Chemical and physical transfers in an ultramafic rock weathering profile: Part 2. Dissolution vs. accumulation of platinum group minerals
- Comparative Raman spectroscopic study on ilmenite-type MgSiO3 (akimotoite), MgGeO3, and MgTiO3 (geikielite) at high temperatures and high pressures
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- Metamorphic vanadian-chromian silicate mineralization in carbon-rich amphibole schists from the Malé Karpaty Mountains, Western Carpathians, Slovakia
- High-temperature deformation of volcanic materials in the presence of water
- Menezesite, the first natural heteropolyniobate, from Cajati, São Paulo, Brazil: Description and crystal structure
- Single-crystal X-ray and Raman investigation on melanophlogite from Varano Marchesi (Parma, Italy)
- Direnzoite, [NaK6MgCa2(Al13Si47O120)·36H2O], a new zeolite from Massif Central (France): Description and crystal structure
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- Density functional calculations of the electronic structure and optical properties of aluminosilicate polymorphs (Al2SiO5)
- Crystal-size distribution and composition of garnets in eclogites from the Dabie orogen, central China
- Cation order/disorder behavior and crystal chemistry of pyrope-grossular garnets: An 17O 3QMAS and 27Al MAS NMR spectroscopic study
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- The nature of unusual luminescence in natural calcite CaCO3
- Carbonate in igneous and metamorphic fluorapatite: Two type A and two type B substitutions
- The crystal structure of diopside at pressure to 10 GPa
- Electron backscatter diffraction analysis of zircon: A systematic assessment of match unit characteristics and pattern indexing optimization
- Compressibility trends of the clinopyroxenes, and in-situ high-pressure single-crystal X-ray diffraction study of jadeite
- Synthesis and characterization of low-OH– fluor-chlorapatite: A single-crystal XRD and NMR spectroscopic study
- Pressure dependence of the hydrogen-bond geometry in topaz-OD from neutron powder diffraction
- Environments around Al, Si, and Ca in aluminate and aluminosilicate melts by X-ray absorption spectroscopy at high temperature
- The origin of S4+ detected in silicate glasses by XANES
- Effects of ionizing radiation on the hollandite structure-type: Ba0.85Cs0.26Al1.35Fe0.77Ti5.90O16
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Articles in the same Issue
- Footemineite, the Mn-analog of atencioite, from the Foote mine, Kings Mountain, Cleveland County, North Carolina, U.S.A., and its relationship with other roscherite-group minerals
- Element mobility and scale of mass transport in the formation of quartz veins during regional metamorphism of the Waits River Formation, east-central Vermont
- Chemical and physical transfers in an ultramafic rock weathering profile: Part 1. Supergene dissolution of Pt-bearing chromite
- Chemical and physical transfers in an ultramafic rock weathering profile: Part 2. Dissolution vs. accumulation of platinum group minerals
- Comparative Raman spectroscopic study on ilmenite-type MgSiO3 (akimotoite), MgGeO3, and MgTiO3 (geikielite) at high temperatures and high pressures
- A low-pressure–high-temperature technique for the piston-cylinder
- Pressure-induced structural deformation and elastic behavior of wairakite
- Metamorphic vanadian-chromian silicate mineralization in carbon-rich amphibole schists from the Malé Karpaty Mountains, Western Carpathians, Slovakia
- High-temperature deformation of volcanic materials in the presence of water
- Menezesite, the first natural heteropolyniobate, from Cajati, São Paulo, Brazil: Description and crystal structure
- Single-crystal X-ray and Raman investigation on melanophlogite from Varano Marchesi (Parma, Italy)
- Direnzoite, [NaK6MgCa2(Al13Si47O120)·36H2O], a new zeolite from Massif Central (France): Description and crystal structure
- On twinning and microstructures in calcite and dolomite
- Density functional calculations of the electronic structure and optical properties of aluminosilicate polymorphs (Al2SiO5)
- Crystal-size distribution and composition of garnets in eclogites from the Dabie orogen, central China
- Cation order/disorder behavior and crystal chemistry of pyrope-grossular garnets: An 17O 3QMAS and 27Al MAS NMR spectroscopic study
- Analytical transmission electron microscopy study of a natural MORB sample assemblage transformed at high pressure and high temperature
- Barioperovskite, BaTiO3, a new mineral from the Benitoite Mine, California
- The nature of unusual luminescence in natural calcite CaCO3
- Carbonate in igneous and metamorphic fluorapatite: Two type A and two type B substitutions
- The crystal structure of diopside at pressure to 10 GPa
- Electron backscatter diffraction analysis of zircon: A systematic assessment of match unit characteristics and pattern indexing optimization
- Compressibility trends of the clinopyroxenes, and in-situ high-pressure single-crystal X-ray diffraction study of jadeite
- Synthesis and characterization of low-OH– fluor-chlorapatite: A single-crystal XRD and NMR spectroscopic study
- Pressure dependence of the hydrogen-bond geometry in topaz-OD from neutron powder diffraction
- Environments around Al, Si, and Ca in aluminate and aluminosilicate melts by X-ray absorption spectroscopy at high temperature
- The origin of S4+ detected in silicate glasses by XANES
- Effects of ionizing radiation on the hollandite structure-type: Ba0.85Cs0.26Al1.35Fe0.77Ti5.90O16
- Letter. Toward a thermal model for the Skaergaard liquidus
