Dellaventuraite, NaNa2(MgMn23+Ti4+Li)Si8O22O2, a new anhydrous amphibole from the Kajlidongri Manganese Mine, Jhabua District, Madhya Pradesh, India
-
Kimberly T. Tait
,
Joel D. Grice
Abstract
Dellaventuraite is a new amphibole species from the Kajlidongri manganese mine, Jhabua District, Madhya Pradesh, India. It occurs with leakeite, kornite, albite, braunite, and bixbyite associated with cross-cutting epigenetic veins that have reacted with regionally metamorphosed rocks containing Mn-rich minerals (braunite, bixbyite, jacobsite, spessartine) to produce Mn-rich amphiboles, Mnrich pyroxenes, Mn-rich mica, piemontite, and manganophyllite. Dellaventuraite occurs as anhedral grains, the color of which varies from pink to red, depending on Mn content. It is brittle, H = 5, Dcalc = 3.184 g/cm3, has a pale pink streak, vitreous luster, and does notfluoresce in ultraviolet light; it has perfect cleavage on {110} and conchoidal fracture. In transmitted plane-polarized light, dellaventuraite is strongly pleochroic, X = pale mauve-brown, Y ~ Z = dark red-brown; Y ^ a = 20° (in β obtuse), Z = b, with absorption X < Y ~ Z. It is biaxial positive, ηα = 1.688 ± 0.003, ηβ = 1.692 ± 0.005, ηγ = 1.721 ± 0.003, 2V(obs) = 49 ± 3°, 2V(calc) = 41°. Dellaventuraite is monoclinic, space group C2/m, a = 9.808(1), b = 17.840(2), c = 5.2848(5) Å, γ = 104.653(1)°, V = 894.6(2) Å3, Z = 2. The strongest ten X-ray diffraction lines in the powder pattern are [d(I,hkl)]: 2.697(10,151), 2.542(9,.202), 3.127(8,310), 3.378(7,131), 2.154(7,261), 1.434 (7,.661), 4.450(6,021), 8.459(5,110), 2.727(5,.331), 2.328(5,.351). Analysis by a combination of electron microprobe, SIMS and crystal-structure refinement gives SiO2 = 54.22, Al2O3 = 0.81, TiO2 = 5.45, Fe2O3 = 6.44, Mn2O3 = 7.57, ZnO = 0.12, NiO = 0.16, MgO = 8.26, Li2O = 1.53, CaO = 1.85, Na2O = 8.12, K2O = 2.12, H2O = 0.80, Cr, V, F, Cl not detected, sum 97.41 wt%. The formula unit, calculated on the basis of 24(O,OH,F) is (K0.40Na0.61)(Na1.71Ca0.29) (Mg1.81Zn0.01 Ni0.02-Li0.90Fe3+0.71Mn3+ 0.85Ti4+ 0.60Al0.10)(Si7.96Al0.04)O22[(OH)0.80 O1.20]; the ideal end-member composition NaNa2(MgMn3+2LiTi04+)Si8O22O2.
The crystal structure of dellaventuraite was refined to an R index of 3.8% using MoKα X-ray intensity data. The M1 site is occupied by Ti4+, Mn4+, and Mg in approximately equal amounts, the M2 site is occupied primarily by Mg and Fe3+, and M3 is occupied by Li with minor Mg and Mn2+. Local bond-valence considerations suggest that O2-at O3 is linked to Ti4+Mg or Mn3+Mn3+ at the adjacent M1 sites, and that OH at O3 is linked to MgMg at the adjacent M1 sites.
© 2015 by Walter de Gruyter Berlin/Boston
Articles in the same Issue
- Comparative planetary mineralogy: Valence state partitioning of Cr, Fe, Ti, and V among crystallographic sites in olivine, pyroxene, and spinel from planetary basalts
- The origin of orthopyroxene/biotite + plagioclase coronas from the Bolangir anorthosite complex (India), and implications for reconstructing P-T paths
- Dellaventuraite, NaNa2(MgMn23+Ti4+Li)Si8O22O2, a new anhydrous amphibole from the Kajlidongri Manganese Mine, Jhabua District, Madhya Pradesh, India
- Successive zoning of Al and H in hydrothermal vein quartz
- The Ti-saturation surface for low-to-medium pressure metapelitic biotites: Implications for geothermometry and Ti-substitution mechanisms
- Thermochemistry of hydrotalcite-like phases in the MgO-Al2O3-CO2-H2O system: A determination of enthalpy, entropy, and free energy
- Igneous thermometers and barometers based on plagioclase + liquid equilibria: Tests of some existing models and new calibrations
- Thermodynamic properties of the Tschermak solid solution in Fe-chlorite: Application to natural examples and possible role of oxidation
- Experimental data on the Tschermak substitution in Fe-chlorite
- Nanometer-sized, divalent-Mn, hydrous silicate domains in geothermal brine precipitates
- Geometric crystal chemical models for structural analysis of micas and their stacking polytypes
- Fundamental difference between synthetic powder and natural or synthetic single-crystal 1M micas: Geometric homo-octahedral vs. geometric meso-octahedral sheets
- The crystal structures of synthetic Fe2(SO4)3(H2O)5 and the type specimen of lausenite
- Experimental study of plagioclase rim growth around anorthite seed crystals in rhyodacitic melt
- Luminescence study of defects in synthetic as-grown and HPHT diamonds compared to natural diamonds
- Molar absorptivities of OH and H2O in rhyolitic glass at room temperature and at 400600 °C
- Ordering and elasticity associated with low-temperature phase transitions in lawsonite
- Formation of metastable cubic-perovskite in high-pressure phase transformation of Ca(Mg, Fe, Al)Si2O6
- Oxygen isotope heterogeneities and diffusion profile in composite metamorphic-magmatic garnets from the Pyrenees
- Unmixed spinel in chromitite from the Iwanai-dake peridotite complex, Hokkaido, Japan: A reaction between peridotite and highly oxidized magma in the mantle wedge
- Mn-bearing “oxy-rossmanite” with tetrahedrally coordinated Al and B from Austria: Structure, chemistry, and infrared and optical spectroscopic study
- Geochemical applications of the simple salt approximation to the lattice energies of complex materials
- Letter: A method for controlling alkali-metal oxide activities in one-atmosphere experiments and its application to measuring the relative activity coeficients of NaO0.5 in silicate melts
- Letter: Very low solubility of rutile in H2O at high pressure and temperature, and its implications for Ti mobility in subduction zones
- Letter: Microscopic strain in synthetic pyrope-grossular solid solutions determined by synchrotron X-ray powder diffraction at 5 K: The relationship to enthalpy of mixing behavior
- Letter: Ferrous hydroxy carbonate is a stable transformation product of biogenic magnetite
Articles in the same Issue
- Comparative planetary mineralogy: Valence state partitioning of Cr, Fe, Ti, and V among crystallographic sites in olivine, pyroxene, and spinel from planetary basalts
- The origin of orthopyroxene/biotite + plagioclase coronas from the Bolangir anorthosite complex (India), and implications for reconstructing P-T paths
- Dellaventuraite, NaNa2(MgMn23+Ti4+Li)Si8O22O2, a new anhydrous amphibole from the Kajlidongri Manganese Mine, Jhabua District, Madhya Pradesh, India
- Successive zoning of Al and H in hydrothermal vein quartz
- The Ti-saturation surface for low-to-medium pressure metapelitic biotites: Implications for geothermometry and Ti-substitution mechanisms
- Thermochemistry of hydrotalcite-like phases in the MgO-Al2O3-CO2-H2O system: A determination of enthalpy, entropy, and free energy
- Igneous thermometers and barometers based on plagioclase + liquid equilibria: Tests of some existing models and new calibrations
- Thermodynamic properties of the Tschermak solid solution in Fe-chlorite: Application to natural examples and possible role of oxidation
- Experimental data on the Tschermak substitution in Fe-chlorite
- Nanometer-sized, divalent-Mn, hydrous silicate domains in geothermal brine precipitates
- Geometric crystal chemical models for structural analysis of micas and their stacking polytypes
- Fundamental difference between synthetic powder and natural or synthetic single-crystal 1M micas: Geometric homo-octahedral vs. geometric meso-octahedral sheets
- The crystal structures of synthetic Fe2(SO4)3(H2O)5 and the type specimen of lausenite
- Experimental study of plagioclase rim growth around anorthite seed crystals in rhyodacitic melt
- Luminescence study of defects in synthetic as-grown and HPHT diamonds compared to natural diamonds
- Molar absorptivities of OH and H2O in rhyolitic glass at room temperature and at 400600 °C
- Ordering and elasticity associated with low-temperature phase transitions in lawsonite
- Formation of metastable cubic-perovskite in high-pressure phase transformation of Ca(Mg, Fe, Al)Si2O6
- Oxygen isotope heterogeneities and diffusion profile in composite metamorphic-magmatic garnets from the Pyrenees
- Unmixed spinel in chromitite from the Iwanai-dake peridotite complex, Hokkaido, Japan: A reaction between peridotite and highly oxidized magma in the mantle wedge
- Mn-bearing “oxy-rossmanite” with tetrahedrally coordinated Al and B from Austria: Structure, chemistry, and infrared and optical spectroscopic study
- Geochemical applications of the simple salt approximation to the lattice energies of complex materials
- Letter: A method for controlling alkali-metal oxide activities in one-atmosphere experiments and its application to measuring the relative activity coeficients of NaO0.5 in silicate melts
- Letter: Very low solubility of rutile in H2O at high pressure and temperature, and its implications for Ti mobility in subduction zones
- Letter: Microscopic strain in synthetic pyrope-grossular solid solutions determined by synchrotron X-ray powder diffraction at 5 K: The relationship to enthalpy of mixing behavior
- Letter: Ferrous hydroxy carbonate is a stable transformation product of biogenic magnetite
