Miguelromeroite, the Mn analogue of sainfeldite, and redefinition of villyaellenite as an ordered intermediate in the sainfeldite-miguelromeroite series
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Anthony R. Kampf
Abstract
Based on single-crystal structure refinements, miguelromeroite, Mn5(H2O)4(AsO3OH)2(AsO4)2, from the Ojuela mine, Mapimi, Durango, Mexico, is described as a new species corresponding to the Mn-dominant member of a series with sainfeldite, Ca5(H2O)4(AsO3OH)2(AsO4)2, and type villyaellenite, (Mn,Ca)Mn2Ca2(H2O)4(AsO3OH)2(AsO4)2, from Sainte-Marie aux Mines, Alsace, France, is redefined as an ordered intermediate species in the series.
Miguelromeroite is monoclinic, C2/c, a = 18.030(1), b = 9.2715(5), c = 9.7756(5) Å, β = 96.266(2)°, V = 1624.4(2) Å3, Z = 4. At the Ojuela mine, miguelromeroite occurs as a compact spray of orangepink, prismatic crystals up to 4 cm in length. Crystals are elongate on [001] with forms {100}, {110} and {101}. Physical properties: pale pink streak, transparent, vitreous luster, brittle, good {100} cleavage, conchoidal fracture, Mohs hardness ~4, measured density 3.69(3) g/cm3, and calculated density 3.714 g/cm3. Optical properties: biaxial (-), nα 1.713(2), nβ 1.723(2), nγ 1.729(2), 2Vmeas 70(5)°, 2Vcalc 75°, orientation X = b, Z ^ c = 40° in obtuse β, pleochroic pale pink, Z >> X > Y. Miguelromeroite is named for Miguel Romero Sanchez (1926-1997) in recognition for his dedication to documenting and preserving Mexico’s rich mineral heritage.
Miguelromeroite also occurs at the Veta Negra mine, Tierra Amarilla, Copiapó Province, Chile, at Sterling Hill, Ogdensburg, Sussex County, New Jersey, and at the Gozaisho mine, Iwaki, Fukushima Prefecture, Honshu Island, Japan. Some material from the Gozaisho mine may correspond to another ordered species in the series with the formula (Ca,Mn)Mn2Ca2(H2O)4(AsO3OH)2(AsO4)2
© 2015 by Walter de Gruyter Berlin/Boston
Articles in the same Issue
- Review Paper. Microbe-clay mineral interactions
- Chemical substitutions, paragenetic relations, and physical conditions of formation of högbomite in the Sittampundi layered anorthosite complex, South India
- Miguelromeroite, the Mn analogue of sainfeldite, and redefinition of villyaellenite as an ordered intermediate in the sainfeldite-miguelromeroite series
- Mechanism and kinetics of a mineral transformation under hydrothermal conditions: Calaverite to metallic gold
- A statistical reassessment of the evidence for the racemic distribution of quartz enantiomorphs
- On the crystal structure and crystal chemistry of pollucite, (Cs,Na)16Al16Si32O96·nH2O: A natural microporous material of interest in nuclear technology
- The effect of fluid inclusion size on determination of homogenization temperature and density of liquid-rich aqueous inclusions
- Effect of SiO2, total FeO, Fe3+/Fe2+, and alkali elements in basaltic glasses on mid-infrared
- Influence of cation size on the low-temperature heat capacity of alkaline earth metasilicate glasses
- The high-pressure–high-temperature behavior of bassanite
- Geochemistry of reversible hydratable tephra from the Trans Mexican Volcanic Belt
- Physical contradictions and remedies using simple polythermal equations of state
- Thermodynamic and crystallographic properties of kornelite [Fe2(SO4)3·~7.75H2O] and paracoquimbite [Fe2(SO4)3·9H2O]
- Humidity-induced phase transitions of ferric sulfate minerals studied by in situ and ex situ X-ray diffraction
- In situ Raman spectroscopy of MgSiO3 enstatite up to 1550 K
- Optical spectroscopic study of tetrahedrally coordinated Co2+ in natural spinel and staurolite at different temperatures and pressures
- New insights into smectite illitization: A zoned K-bentonite revisited
- The hydrothermal conversion of kaolinite to kalsilite: Influence of time, temperature, and pH
- Sideronatrite, Na2Fe(SO4)2(OH)·3H2O: Crystal structure of the orthorhombic polytype and OD character analysis
- Anharmonic OH vibrations in brucite: Small pressure-induced redshift in the range 0–22 GPa
- Structural properties of biologically controlled hydrozincite: An HRTEM and NMR spectroscopic study
- Mechanism of wollastonite carbonation deduced from micro- to nanometer length scale observations
- Letter. Crystal structure of argentopyrite, AgFe2S3, and its relationship with cubanite
- Letter. Magnetite-free, yellow lizardite serpentinization of olivine websterite, Canyon Mountain complex, N.E. Oregon
- Letter. The influence of atomic size and charge of dissolved species on the diffusivity and viscosity of silicate melts
- Letter. Si-Al distribution in high-pressure CaAl4Si2O11 phase: A 29Si and 27Al NMR study
Articles in the same Issue
- Review Paper. Microbe-clay mineral interactions
- Chemical substitutions, paragenetic relations, and physical conditions of formation of högbomite in the Sittampundi layered anorthosite complex, South India
- Miguelromeroite, the Mn analogue of sainfeldite, and redefinition of villyaellenite as an ordered intermediate in the sainfeldite-miguelromeroite series
- Mechanism and kinetics of a mineral transformation under hydrothermal conditions: Calaverite to metallic gold
- A statistical reassessment of the evidence for the racemic distribution of quartz enantiomorphs
- On the crystal structure and crystal chemistry of pollucite, (Cs,Na)16Al16Si32O96·nH2O: A natural microporous material of interest in nuclear technology
- The effect of fluid inclusion size on determination of homogenization temperature and density of liquid-rich aqueous inclusions
- Effect of SiO2, total FeO, Fe3+/Fe2+, and alkali elements in basaltic glasses on mid-infrared
- Influence of cation size on the low-temperature heat capacity of alkaline earth metasilicate glasses
- The high-pressure–high-temperature behavior of bassanite
- Geochemistry of reversible hydratable tephra from the Trans Mexican Volcanic Belt
- Physical contradictions and remedies using simple polythermal equations of state
- Thermodynamic and crystallographic properties of kornelite [Fe2(SO4)3·~7.75H2O] and paracoquimbite [Fe2(SO4)3·9H2O]
- Humidity-induced phase transitions of ferric sulfate minerals studied by in situ and ex situ X-ray diffraction
- In situ Raman spectroscopy of MgSiO3 enstatite up to 1550 K
- Optical spectroscopic study of tetrahedrally coordinated Co2+ in natural spinel and staurolite at different temperatures and pressures
- New insights into smectite illitization: A zoned K-bentonite revisited
- The hydrothermal conversion of kaolinite to kalsilite: Influence of time, temperature, and pH
- Sideronatrite, Na2Fe(SO4)2(OH)·3H2O: Crystal structure of the orthorhombic polytype and OD character analysis
- Anharmonic OH vibrations in brucite: Small pressure-induced redshift in the range 0–22 GPa
- Structural properties of biologically controlled hydrozincite: An HRTEM and NMR spectroscopic study
- Mechanism of wollastonite carbonation deduced from micro- to nanometer length scale observations
- Letter. Crystal structure of argentopyrite, AgFe2S3, and its relationship with cubanite
- Letter. Magnetite-free, yellow lizardite serpentinization of olivine websterite, Canyon Mountain complex, N.E. Oregon
- Letter. The influence of atomic size and charge of dissolved species on the diffusivity and viscosity of silicate melts
- Letter. Si-Al distribution in high-pressure CaAl4Si2O11 phase: A 29Si and 27Al NMR study
