• Verification - Mindat.org

    www.mindat.org/min-1660.html Large number of pages viewed. While we don't want to limit you viewing as many pages as you would like on mindat.org, we do need to prevent people from automated downloads of our content.
  • Gaudefroyite Mineral Data

    www.webmineral.com/data/Gaudefroyite.shtml Gaudefroyite Crystallography: Axial Ratios: a:c = 1:0.55633 : Cell Dimensions: a = 10.589, c = 5.891, Z = 2; V = 572.04 Den(Calc)= 3.38 : Crystal System:
  • Gaudefroyite - Mindat.org

    www.mindat.org/gm/1660 1.8 x 0.7 x 0.5 cm. Gaudefroyite is a very rare calcium, manganese borate found at only four localities worldwide, three of which, are in the Kalahari Manganese Field of South Africa. This is an exceptionally rare and large, doubly-terminated, jet-black crystal with high lustre. The terminations are sharp and the crystal is complete-all-around.
  • What does gaudefroyite mean? - definitions

    www.definitions.net/definition/gaudefroyite Definition of gaudefroyite in the Definitions.net dictionary. Meaning of gaudefroyite. What does gaudefroyite mean? Information and translations of gaudefroyite in the most comprehensive dictionary definitions resource on the web.
  • GAUDEFROYITE * FINE CRYSTALS * RARE ! N'Chwaning, SOUTH ...

    www.ebay.com/itm/.../312339453744 Black lustrous crystal (9mm) of gaudefroyite . origin: N'Chwaning II Mine, N'Chwaning Mines, Kuruman, Kalahari manganese field, Northern Cape Province, South Africa. size: 24 X 13 X 12mm.
  • Gaudefroyite Mineral Data - Mineralogy Database

    webmin.mindat.org/data/Gaudefroyite.shtml General Gaudefroyite Information : Chemical Formula: Ca4Mn+++3-x(BO3)3(CO3)(O,OH)3 : Composition: Molecular Weight = 582.85 gm Calcium 27.51 % Ca 38.49 % CaO: Manganese 23.56 % Mn 33.86 % Mn 2 O 3: Boron 5.56 % B 17.92 % B 2 O 3: Hydrogen 0.13 % H 1.16 % H 2 O: Carbon 2.06 % C 7.55 % CO 2: Oxygen 41.18 % O: 100.00 % 98.97 % = TOTAL OXIDE
  • GAUDEFROYITE crystals * N'Chwaning Mines * South Africa | eBay

    www.ebay.com/itm/.../373057684411 Gaudefroyite. N'Chwaning Mines * South Africa *** We Buy Collections *** 1.5 x 3/4 x 5/8 inch. Here is a beautiful cluster of Gaudefroyite crystals with Ettringite from the N'Chwaning Mines * South Africa. Please note the size before you bid! ***** We do combine shipping on multilpe wins. We charge actual shipping costs.
  • Gaudefroyite: a mineral with excellent magnetocaloric ...

    pubs.rsc.org/en/content/articlelanding/2018/ta/c7ta06883b Gaudefroyite contains chains of edge-linked MnO6 octahedra on a Kagomé lattice which results in magnetic frustration between the chains and overall spin-liquid behaviour below 9 K. Magnetization and specific heat measurements indicate very large entropy increases for temperatures of 10–30 K on removal of app Recent Open Access Articles Advances in Solid State Chemistry and its Applications
  • GAUDEFROYITE, Ca8Mn3+6[(BO3)6(CO3)2O6]: HIGH-TEMPERATURE ...

    pubs.geoscienceworld.org/canmin/.../gaudefroyite-ca8mn3-6-bo3-6-co3-2o6-high The structural behavior of gaudefroyite, Ca 8 Mn 3+ 6 [(BO 3) 6 (CO 3) 2 O 6], was determined by using Rietveld refinements based on synchrotron powder X-ray-diffraction data from 25 to 486°C.The structure was also refined at 25°C using synchrotron high-resolution powder X-ray-diffraction (HRPXRD) data that gave the pseudohexagonal unit-cell parameters a 10.60791(2), c 5.88603(1) Å, and V ...
  • Gaudefroyite

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