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Guimaraesite Mineral Data
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General Guimaraesite Information
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 Chemical Formula: |
Ca2(Zn,Mg,Fe)5Be4(PO4)6(OH)4•6H2O |
| Composition: |
Molecular Weight = 1,107.66 gm |
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Calcium 7.24 % Ca 10.13 % CaO |
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Magnesium 3.84 % Mg 6.37 % MgO |
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Beryllium 3.25 % Be 9.03 % BeO |
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Zinc 13.28 % Zn 16.53 % ZnO |
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Iron 5.04 % Fe 6.49 % FeO |
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Phosphorus 16.78 % P 38.44 % P2O5 |
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Hydrogen 1.46 % H 13.01 % H2O |
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Oxygen 49.11 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
| Empirical Formula: |
Ca2Zn2.25Mg1.75Fe2+Be4(PO4)6(OH)4•6(H2O) |
| Environment: |
Roscherite group. Zinc analog of zanazziite. |
| IMA Status: |
Proposed IMA 2006 |
| Locality: |
Granite pegmatite near the Piau� river, Itinga county, Minas Gerais, Brazil Link to MinDat.org Location Data. |
| Name Origin: |
Commission on New Minerals, Nomenclature and Classification (CNMNC) |
| Synonym: |
IMA2006-028 |
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Guimaraesite Image |
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Images:
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Guimaraesite
Comments: Brown guimaraesite spheres and crystal aggregates..
Location: Piaui district, Itinga, Minas Gerais, Brazil.
Scale: Specimen size 2 mm.
© Diederik Visser |
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Images:
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Guimaraesite
Comments: Botryoidal guimaraesite on eosphorite.
Location: Piaul District, Itinga, Minas Gerais, Brazil.
Scale: Specimen size 1.1 x 0.9 x 0.8 cm.
© Rob Lavinsky |
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Guimaraesite Crystallography
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| Axial Ratios: |
a:b:c =1.3496:1:0.5599 |
| Cell Dimensions: |
a = 15.98, b = 11.84, c = 6.63, Z = 2; beta = 95.15° V = 1,249.35 Den(Calc)= 2.94 |
| Crystal System: |
Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/c |
| X Ray Diffraction: |
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), |
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Physical Properties of Guimaraesite
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| Color: |
Brown. |
| Diaphaneity: |
Transparent |
| Habit: |
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline). |
| Luster: |
Vitreous (Glassy) |
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Optical Properties of Guimaraesite
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| Optical Data: |
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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| Electron Density: |
Bulk Density (Electron Density)=2.91 gm/cc
note: Specific Gravity of Guimaraesite =2.94 gm/cc.
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| Fermion Index: |
Fermion Index = 0.04
Boson Index = 0.96 |
| Photoelectric: |
PEGuimaraesite = 9.74 barns/electron
U=PEGuimaraesite x rElectron Density= 28.37 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Guimaraesite is Not Radioactive |
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Guimaraesite Classification
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| Dana Class: |
42.07.07.06 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen |
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(42.07)where (AB)5 (XO4)3 Zq � x(H2O) |
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(42.07.07)Roscherite group |
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42.07.07.01 Roscherite Ca(Mn,Fe)5Be4(PO4)6(OH)4•6(H2O) C1 1 |
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42.07.07.03 Zanazziite Ca2(Mg,Fe)(Mg,Fe,Al,Mn,Fe)4Be4(PO4)6(OH)4•6(H2O) C 2/c 2/m |
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42.07.07.04 Greifensteinite! Ca2Be4(Fe,Mn)5(PO4)6(OH)4•6(H2O) C 2/c 2/m |
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42.07.07.05 Atencioite! Ca2Fe[]Mg2Fe2Be4(PO4)6(OH)4•6H2O P1 1 |
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42.07.07.06 Guimaraesite Ca2(Zn,Mg,Fe)5Be4(PO4)6(OH)4•6H2O C 2/c 2/m |
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42.07.07.07 Footemineite! Ca2MnMn2Mn2Be4(PO4)6(OH)4•6H2O P1 1 |
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42.07.07.08 Ruifrancoite! Ca2([],Mn)2(Fe,Mn,Mg)4Be4(PO4)6(OH)4•6H2O C 2/c 2/m |
| Strunz Class: |
08.DA.10 08 - PHOSPHATES, ARSENATES, VANADATES |
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08.D - Phosphates, etc |
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08.DA -With small (and occasionally larger) cations |
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08.DA.10 Roscherite Ca(Mn,Fe)5Be4(PO4)6(OH)4•6(H2O) C1 1 |
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08.DA.10 Zanazziite Ca2(Mg,Fe)(Mg,Fe,Al,Mn,Fe)4Be4(PO4)6(OH)4•6(H2O) C 2/c 2/m |
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08.DA.10 Footemineite! Ca2MnMn2Mn2Be4(PO4)6(OH)4•6H2O P1 1 |
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08.DA.10 Atencioite! Ca2Fe[]Mg2Fe2Be4(PO4)6(OH)4•6H2O P1 1 |
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08.DA.10 Greifensteinite! Ca2Be4(Fe,Mn)5(PO4)6(OH)4•6(H2O) C 2/c 2/m |
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08.DA.10 Ruifrancoite! Ca2([],Mn)2(Fe,Mn,Mg)4Be4(PO4)6(OH)4•6H2O C 2/c 2/m |
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08.DA.10 Guimaraesite Ca2(Zn,Mg,Fe)5Be4(PO4)6(OH)4•6H2O C 2/c 2/m |
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Other Guimaraesite Information
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| See Also: |
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
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Guimaraesite
Ca2(Zn,Mg,Fe)5Be4(PO4)6(OH)4•6H2O
Dana No: 42.07.07.06 Strunz No: 08.DA.10
Locality:
Notes:
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