Skip to main content
Article
Licensed
Unlicensed Requires Authentication

Hardystonite from Franklin Furnace: A natural modulated melilite

  • , , and EMAIL logo
Published/Copyright: March 26, 2015
Become an author with De Gruyter Brill
Author Information
American Mineralogist
From the journal American Mineralogist Volume 86 Issue 5-6

Abstract

Natural hardystonite, (Ca1.85Na0.14Pb0.01)(Zn0.85Al0.07Mg0.03Mn3+0.04Fe3+0.02)Si2.00O7.00, from the type locality was reinvestigated with single crystal X-ray diffraction, microprobe analysis, and electron diffraction. The average structure, space group P4̅21m, a = 7.800(1) Å, c = 5.000(1) Å, was refined to R = 1.91% using 331 independent reflections. Hardystonite exhibits an incommensurate modulated structure. As in synthetic melilite-type compounds, modulation is two-dimensional, with tartan- like appearance; modulation vectors are q1 = α(a1* + a2*) and q2 = α(-a1* + a2*). A modulation wavelength λ = 19.0(4) Å was estimated by centering satellite reflections using a single-crystal diffractometer. TEM-EDX investigations proved the chemical composition of the sample to be slightly inhomogeneous, with stronger and sharper satellites in the regions where the composition approaches the Ca2ZnSi2O7 end-member. Geometrical parameters as well as anisotropic displacement ellipsoids of hardystonite are consistent with those of the other melilite-type compounds having a modulated character.

Received: 2000-2-7
Accepted: 2001-1-26
Published Online: 2015-3-26
Published in Print: 2001-5-1

© 2015 by Walter de Gruyter Berlin/Boston

Articles in the same Issue

  1. Growth of megaspherulites in a rhyolitic vitrophyre
  2. Electron microscope study of the reaction olivine + H2O + TiO2 → titanian clinohumite + Titanian chondrodite synthesized at 8 GPa, 1300 K
  3. In situ discovery of shock-induced graphite-diamond phase transition in gneisses from the Ries Crater, Germany
  4. Evaluation of shear moduli and other properties of silicates with the spinel structure from IR spectroscopy
  5. Thermodynamics of the amphiboles: Anthophyllite-ferroanthophyllite and the ortho-clino phase loop
  6. Illumination of vein quartz textures in a porphyry copper ore deposit using scanned cathodoluminescence: Grasberg Igneous Complex, Irian Jaya, Indonesia
  7. Rare earth elements in synthetic zircon: Part 1. Synthesis, and rare earth element and phosphorus doping
  8. Rare-earth elements in synthetic zircon: Part 2. A single-crystal X-ray study of xenotime substitution
  9. Single-crystal in situ high-temperature structural investigation on strontium feldspar
  10. Evidence of heterovalent europium in zoned Llallagua apatite using wavelength dispersive XANES
  11. Characterization of manganese oxide mineralogy in rock varnish and dendrites using X-ray absorption spectroscopy
  12. Oxidation state and coordination of Fe in minerals: An Fe K-XANES spectroscopic study
  13. Mössbauer and XAS study of a green rust mineral; the partial substitution of Fe2+ by Mg2+
  14. Potential host phase of aluminum and potassium in the Earth’s lower mantle
  15. Hardystonite from Franklin Furnace: A natural modulated melilite
  16. Molecular dynamics simulations of seismic discontinuities and phase transitions of MgSiO3 from 4 to 6-coordinated silicate via a novel 5-coordinated phase
  17. Ab initio study of MgSiO3 low-clinoenstatite at high pressure
https://doi.org/10.2138/am-2001-5-615

Articles in the same Issue

  1. Growth of megaspherulites in a rhyolitic vitrophyre
  2. Electron microscope study of the reaction olivine + H2O + TiO2 → titanian clinohumite + Titanian chondrodite synthesized at 8 GPa, 1300 K
  3. In situ discovery of shock-induced graphite-diamond phase transition in gneisses from the Ries Crater, Germany
  4. Evaluation of shear moduli and other properties of silicates with the spinel structure from IR spectroscopy
  5. Thermodynamics of the amphiboles: Anthophyllite-ferroanthophyllite and the ortho-clino phase loop
  6. Illumination of vein quartz textures in a porphyry copper ore deposit using scanned cathodoluminescence: Grasberg Igneous Complex, Irian Jaya, Indonesia
  7. Rare earth elements in synthetic zircon: Part 1. Synthesis, and rare earth element and phosphorus doping
  8. Rare-earth elements in synthetic zircon: Part 2. A single-crystal X-ray study of xenotime substitution
  9. Single-crystal in situ high-temperature structural investigation on strontium feldspar
  10. Evidence of heterovalent europium in zoned Llallagua apatite using wavelength dispersive XANES
  11. Characterization of manganese oxide mineralogy in rock varnish and dendrites using X-ray absorption spectroscopy
  12. Oxidation state and coordination of Fe in minerals: An Fe K-XANES spectroscopic study
  13. Mössbauer and XAS study of a green rust mineral; the partial substitution of Fe2+ by Mg2+
  14. Potential host phase of aluminum and potassium in the Earth’s lower mantle
  15. Hardystonite from Franklin Furnace: A natural modulated melilite
  16. Molecular dynamics simulations of seismic discontinuities and phase transitions of MgSiO3 from 4 to 6-coordinated silicate via a novel 5-coordinated phase
  17. Ab initio study of MgSiO3 low-clinoenstatite at high pressure
Downloaded on 17.4.2026 from https://www.degruyterbrill.com/document/doi/10.2138/am-2001-5-615/html
Scroll to top button