Home Physical Sciences Ferripedrizite, a new monoclinic BLi amphibole end-member from the Eastern Pedriza Massif, Sierra de Guadarrama, Spain, and a restatement of the nomenclature of Mg-Fe-Mn-Li amphiboles
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Ferripedrizite, a new monoclinic BLi amphibole end-member from the Eastern Pedriza Massif, Sierra de Guadarrama, Spain, and a restatement of the nomenclature of Mg-Fe-Mn-Li amphiboles

  • José M. Caballero EMAIL logo , Roberta Oberti and Luisa Ottolini
Published/Copyright: March 28, 2015
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American Mineralogist
From the journal American Mineralogist Volume 87 Issue 7

Abstract

Ferripedrizite, ideally ANaBLi2C(Fe3+2Mg2Li)TSi8O22X(OH)2, is a new amphibole end-member found in episyenites formed after cordierite-bearing porphyritic granites in the Eastern Pedriza Massif (Central System, Spain). It contains the maximum amount of Li that can be incorporated in the amphibole structure. The name was approved by the IMA-CNMMN together with restriction of the use of the prefix sodic in the pedrizite series to compositions with BNa > 0.5 apfu; its use for compositions with Natot > 0.5 apfu has been maintained in the rest of the Mg-Fe-Mn-Li group. Complete solid solution between ferripedrizite and leakeite [ideally, ANaBNa2C(Fe3+2Mg2Li)TSi8O22X(OH)2] has been found in the Pedriza Massif. According to the present nomenclature rules, this join bridges three different amphibole groups. Samples with B(Mg+Fe+Mn+Li) ≥ 1.0 apfu and 0. 0 £ BNa £ 0.50 apfu belong to the Mg-Fe-Mn-Li group and are termed ferripedrizite; samples with B(Mg + Fe + Mn + Li) ≥1.0 apfu and 0.50 < BNa £ 0.99 apfu belong to the Mg-Fe-Mn-Li group and are called sodicferripedrizite; samples with B(Mg + Fe + Mn + Li) < 1.0 apfu and BNa ≥ 1.50 apfu belong to the sodic group and are named leakeite; samples with B(Mg+Fe+Mn+Li) < 1.0 apfu and 1.0 £ BNa < 1.50 apfu belong to the sodic-calcic group (albeit Ca is negligible) and deserve a new root name.

The ferripedrizite sample from Pedriza is black, vitreous, translucent, non-fluorescent, and brittle, and has gray streak, H = 6, uneven fracture, perfect {110} cleavage, Dmeas = 3.15, Dcalc = 3.19 g/cm3. It is strongly pleochroic, X = yellow green, Y = green blue, Z = bluish green (Y = Z >> X), Z = b, Y ^ c = 15(6)°, X ^ a = 3°. It is biaxial positive: a = 1.695(1), b = 1.700(2), and g = 1.702(1); 2VZ = 125(17)°, dispersion r > v. It is monoclinic, space group C2/m, a = 9.501(1), b = 17.866(2), c = 5.292(1) Å, b = 102.17(2)°, V = 878.1(2) Å3. The ten strongest lines in the X-ray powder-diffraction pattern [d in Å,(I),(hkl)] are: 8.251(3)(110), 4.466(2)(040), 3.411(2)(131), 3.050(10)(310), 2.747(3)(330), 2.711(4)(151), 2.495(2)(2-02), 2.161(2)(261), 1.642(4)(461), 1.394(3)(6-61). Structure refinement and electron- and ion-microprobe analysis of a crystal with composition A(K0.04Na0.52)B(Na0.25Ca0.05Li1.70)C(Li0.64Fe3+1.64Mg1.49Fe2+0.85Al0.21Ti0.09Mn0.07Zn0.01)TSi8O22X(OH1.31F0.69) are provided, together with some discussion on cation ordering

Received: 2001-9-4
Accepted: 2002-1-30
Published Online: 2015-3-28
Published in Print: 2002-7-1

© 2015 by Walter de Gruyter Berlin/Boston

Articles in the same Issue

  1. Thermal equations of state for B1 and B2 KCl
  2. Determination of molar absorptivities for infrared absorption bands of H2O in andesitic glasses
  3. H2O activity in H2O-N2 fluids at high pressure and temperature measured by the brucitepericlase equilibrium
  4. Kinetics of iron oxidation-reduction in hydrous silicic melts
  5. Kinetics of cation ordering in synthetic MgAl2O4 spinel
  6. Structural properties and heat-induced oxidation-dehydrogenation of manganoan ilvaite from Perda Niedda mine, Sardinia, Italy
  7. Ultrahigh-pressure metamorphism in western Tianshan, China: Part I. Evidence from inclusions of coesite pseudomorphs in garnet and from quartz exsolution lamellae in omphacite in eclogites
  8. Ultra-high pressure metamorphism in western Tianshan, China: Part II. Evidence from magnesite in eclogite
  9. Discovery of clinoenstatite in garnet pyroxenites from the Dabie-Sulu ultrahigh-pressure terrane, east-central China
  10. Ultrahigh-pressure (UHP) low-Al titanites from carbonate-bearing rocks in Dabieshan- Sulu UHP terrane, eastern China
  11. Metamictization and recrystallization of titanite: An infrared spectroscopic study
  12. Fine structure of infrared OH-stretching bands in natural and heat-treated amphiboles of the tremolite-ferro-actinolite series
  13. Correlation between OH concentration and oxygen isotope diffusion rate in diopsides from the Adirondack Mountains, New York
  14. The substitution Fe3+-Al and the isosymmetric displacive phase transition in synthetic zoisite: A powder X-ray and infrared spectroscopy study
  15. In situ X-ray observation of the reaction dolomite = aragonite + magnesite at 900–1300 K
  16. High-pressure single-crystal X-ray and powder neutron study of F,OH/OD-chondrodite: Compressibility, structure, and hydrogen bonding
  17. Quantitative characterization of biotic iron oxides by analytical electron microscopy
  18. Synthesis and NMR characterization (1H and 31P MAS) of the fluorine-free hydroxylapatite–britholite-(Y) series
  19. Quantum mechanical calculations of dioctahedral 2:1 phyllosilicates: Effect of octahedral cation distributions in pyrophyllite, illite, and smectite
  20. The nature of disorder in montmorillonite by simulation of X-ray powder patterns
  21. Ferripedrizite, a new monoclinic BLi amphibole end-member from the Eastern Pedriza Massif, Sierra de Guadarrama, Spain, and a restatement of the nomenclature of Mg-Fe-Mn-Li amphiboles
  22. Description and crystal structure of vajdakite, [(Mo6+O2)2(H2O)2 As3+ 2O5]·H2O—A new mineral from Jáchymov, Czech Republic
  23. Some remarks on fission-track observational biases and crystallographic orientation effects
  24. Surface reconstruction and As-polymerization at fractured loellingite (FeAs2) surfaces
  25. The strength of moissanite
  26. Diamond formation through carbonate-silicate interaction
  27. Anisotropic Fe-Mg diffusion in biotite
  28. Characterization of a high-pressure phase of silica from the Martian meteorite Shergotty
https://doi.org/10.2138/am-2002-0721

Articles in the same Issue

  1. Thermal equations of state for B1 and B2 KCl
  2. Determination of molar absorptivities for infrared absorption bands of H2O in andesitic glasses
  3. H2O activity in H2O-N2 fluids at high pressure and temperature measured by the brucitepericlase equilibrium
  4. Kinetics of iron oxidation-reduction in hydrous silicic melts
  5. Kinetics of cation ordering in synthetic MgAl2O4 spinel
  6. Structural properties and heat-induced oxidation-dehydrogenation of manganoan ilvaite from Perda Niedda mine, Sardinia, Italy
  7. Ultrahigh-pressure metamorphism in western Tianshan, China: Part I. Evidence from inclusions of coesite pseudomorphs in garnet and from quartz exsolution lamellae in omphacite in eclogites
  8. Ultra-high pressure metamorphism in western Tianshan, China: Part II. Evidence from magnesite in eclogite
  9. Discovery of clinoenstatite in garnet pyroxenites from the Dabie-Sulu ultrahigh-pressure terrane, east-central China
  10. Ultrahigh-pressure (UHP) low-Al titanites from carbonate-bearing rocks in Dabieshan- Sulu UHP terrane, eastern China
  11. Metamictization and recrystallization of titanite: An infrared spectroscopic study
  12. Fine structure of infrared OH-stretching bands in natural and heat-treated amphiboles of the tremolite-ferro-actinolite series
  13. Correlation between OH concentration and oxygen isotope diffusion rate in diopsides from the Adirondack Mountains, New York
  14. The substitution Fe3+-Al and the isosymmetric displacive phase transition in synthetic zoisite: A powder X-ray and infrared spectroscopy study
  15. In situ X-ray observation of the reaction dolomite = aragonite + magnesite at 900–1300 K
  16. High-pressure single-crystal X-ray and powder neutron study of F,OH/OD-chondrodite: Compressibility, structure, and hydrogen bonding
  17. Quantitative characterization of biotic iron oxides by analytical electron microscopy
  18. Synthesis and NMR characterization (1H and 31P MAS) of the fluorine-free hydroxylapatite–britholite-(Y) series
  19. Quantum mechanical calculations of dioctahedral 2:1 phyllosilicates: Effect of octahedral cation distributions in pyrophyllite, illite, and smectite
  20. The nature of disorder in montmorillonite by simulation of X-ray powder patterns
  21. Ferripedrizite, a new monoclinic BLi amphibole end-member from the Eastern Pedriza Massif, Sierra de Guadarrama, Spain, and a restatement of the nomenclature of Mg-Fe-Mn-Li amphiboles
  22. Description and crystal structure of vajdakite, [(Mo6+O2)2(H2O)2 As3+ 2O5]·H2O—A new mineral from Jáchymov, Czech Republic
  23. Some remarks on fission-track observational biases and crystallographic orientation effects
  24. Surface reconstruction and As-polymerization at fractured loellingite (FeAs2) surfaces
  25. The strength of moissanite
  26. Diamond formation through carbonate-silicate interaction
  27. Anisotropic Fe-Mg diffusion in biotite
  28. Characterization of a high-pressure phase of silica from the Martian meteorite Shergotty
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