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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José M. Caballero
,
Roberta Oberti
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
© 2015 by Walter de Gruyter Berlin/Boston
Artikel in diesem Heft
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Artikel in diesem Heft
- Thermal equations of state for B1 and B2 KCl
- Determination of molar absorptivities for infrared absorption bands of H2O in andesitic glasses
- H2O activity in H2O-N2 fluids at high pressure and temperature measured by the brucitepericlase equilibrium
- Kinetics of iron oxidation-reduction in hydrous silicic melts
- Kinetics of cation ordering in synthetic MgAl2O4 spinel
- Structural properties and heat-induced oxidation-dehydrogenation of manganoan ilvaite from Perda Niedda mine, Sardinia, Italy
- 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
- Ultra-high pressure metamorphism in western Tianshan, China: Part II. Evidence from magnesite in eclogite
- Discovery of clinoenstatite in garnet pyroxenites from the Dabie-Sulu ultrahigh-pressure terrane, east-central China
- Ultrahigh-pressure (UHP) low-Al titanites from carbonate-bearing rocks in Dabieshan- Sulu UHP terrane, eastern China
- Metamictization and recrystallization of titanite: An infrared spectroscopic study
- Fine structure of infrared OH-stretching bands in natural and heat-treated amphiboles of the tremolite-ferro-actinolite series
- Correlation between OH concentration and oxygen isotope diffusion rate in diopsides from the Adirondack Mountains, New York
- The substitution Fe3+-Al and the isosymmetric displacive phase transition in synthetic zoisite: A powder X-ray and infrared spectroscopy study
- In situ X-ray observation of the reaction dolomite = aragonite + magnesite at 900–1300 K
- High-pressure single-crystal X-ray and powder neutron study of F,OH/OD-chondrodite: Compressibility, structure, and hydrogen bonding
- Quantitative characterization of biotic iron oxides by analytical electron microscopy
- Synthesis and NMR characterization (1H and 31P MAS) of the fluorine-free hydroxylapatite–britholite-(Y) series
- Quantum mechanical calculations of dioctahedral 2:1 phyllosilicates: Effect of octahedral cation distributions in pyrophyllite, illite, and smectite
- The nature of disorder in montmorillonite by simulation of X-ray powder patterns
- 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
- Description and crystal structure of vajdakite, [(Mo6+O2)2(H2O)2 As3+ 2O5]·H2O—A new mineral from Jáchymov, Czech Republic
- Some remarks on fission-track observational biases and crystallographic orientation effects
- Surface reconstruction and As-polymerization at fractured loellingite (FeAs2) surfaces
- The strength of moissanite
- Diamond formation through carbonate-silicate interaction
- Anisotropic Fe-Mg diffusion in biotite
- Characterization of a high-pressure phase of silica from the Martian meteorite Shergotty
