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Guimaraesite Mineral Data |
General Guimaraesite Information |
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Ca2(Zn,Mg,Fe)5Be4(PO4)6(OH)4•6H2O | ||
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Molecular Weight = 1,107.66 gm | ||
Calcium 7.24 % Ca 10.13 % CaO | |||
Magnesium 3.84 % Mg 6.37 % MgO | |||
Beryllium 3.25 % Be 9.03 % BeO | |||
Zinc 13.28 % Zn 16.53 % ZnO | |||
Iron 5.04 % Fe 6.49 % FeO | |||
Phosphorus 16.78 % P 38.44 % P2O5 | |||
Hydrogen 1.46 % H 13.01 % H2O | |||
Oxygen 49.11 % O | |||
______ ______ | |||
100.00 % 100.00 % = TOTAL OXIDE | |||
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Ca2Zn2.25Mg1.75Fe2+Be4(PO4)6(OH)4•6(H2O) | ||
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Roscherite group. Zinc analog of zanazziite. | ||
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Proposed IMA 2006 | ||
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Granite pegmatite near the Piau� river, Itinga county, Minas Gerais, Brazil Link to MinDat.org Location Data. | ||
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Commission on New Minerals, Nomenclature and Classification (CNMNC) | ||
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IMA2006-028 | ||
Guimaraesite Image | |||
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Guimaraesite Crystallography |
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a:b:c =1.3496:1:0.5599 | ||
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a = 15.98, b = 11.84, c = 6.63, Z = 2; beta = 95.15° V = 1,249.35 Den(Calc)= 2.94 | ||
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Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/c | ||
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By Intensity(I/Io): 5.98(1), 3.152(0.9), 9.48(0.9),4.82(0.8), 2.708(0.8), 2.961(0.7), 3.052(0.7), 2.841(0.7), | ||
Physical Properties of Guimaraesite |
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Brown. | ||
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Transparent | ||
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Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline). | ||
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Vitreous (Glassy) | ||
Optical Properties of Guimaraesite |
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NCalc= 1.61 - from Gladstone-Dale relationship (KC = 0.2086) where Ncalc=Dcalc*KC+1 |
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Calculated Properties of Guimaraesite |
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Bulk Density (Electron Density)=2.91 gm/cc note: Specific Gravity of Guimaraesite =2.94 gm/cc. |
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Fermion Index = 0.04 Boson Index = 0.96 |
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PEGuimaraesite = 9.74 barns/electron U=PEGuimaraesite x rElectron Density= 28.37 barns/cc. |
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GRapi = 0 (Gamma Ray American Petroleum Institute Units) Guimaraesite is Not Radioactive |
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Guimaraesite Classification |
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42.07.07.06 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen | ||
(42.07)where (AB)5 (XO4)3 Zq � x(H2O) | |||
(42.07.07)Roscherite group | |||
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08.DA.10 08 - PHOSPHATES, ARSENATES, VANADATES | ||
08.D - Phosphates, etc | |||
08.DA -With small (and occasionally larger) cations | |||
Other Guimaraesite Information |
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Links to other databases for Guimaraesite : 1 - Am. Min. Crystal Structure Database 2 - Athena 3 - GeoScienceWorld 4 - Google Images 5 - Google Scholar 6 - MinDAT 7 - Mineralienatlas (Deutsch) 8 - Online Mineral Museum 9 - QUT Mineral Atlas 10 - Ruff.Info Search for Guimaraesite using: Visit our Advertisers for Guimaraesite : Ask about Guimaraesite here : Print or Cut-and-Paste your Guimaraesite Specimen Label here :
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