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Atencioite Mineral Data

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General Atencioite Information

Help on Chemical  Formula: Chemical Formula: Ca2Fe++[ ]Mg2Fe++2Be4(PO4)6(OH)4•6H2O
Help on Composition: Composition: Molecular Weight = 1,060.05 gm
   Calcium      7.07 %  Ca    9.89 % CaO
   Magnesium    5.14 %  Mg    8.52 % MgO
   Manganese    0.98 %  Mn    1.27 % MnO
   Beryllium    3.34 %  Be    9.27 % BeO
   Aluminum     0.20 %  Al    0.38 % Al2O3
   Iron        13.17 %  Fe   13.42 % FeO /  3.92 % Fe2O3
   Phosphorus  17.53 %  P    40.17 % P2O5
   Hydrogen     1.47 %  H    13.15 % H2O
   Oxygen      51.09 %  O
              ______        ______ 
              100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca1.87Mg2.24Mn2+0.19Fe2+1.98Fe3+0.52Al0.08Be3.93(PO4)6(OH)4.22�5.63(H2O)
Help on Environment: Environment: Occurs in granite pegmatite. Related to roscherite.
Help on IMA Status: IMA Status: Approved IMA 2004 (Dana # Added)
Help on Locality: Locality: Linopolis, Divino das Laranjeiras, Minas Gerais State, Brazil Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Dr. Daniel Atencio, professor of mineralogy at the Geoscience Institute of the University of S�o Paulo, Brazil.
Help on Synonym: Synonym: IMA2004-041

Atencioite Image

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Comments: Nodule of tan atenciote.
Location: Pomaroli Mine, Linópolis,Minas Gerais, Brazil. Scale: Specimen size 1 cm.
© Adam Larson

Atencioite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.6749:1:1.0004
Help on Cell Dimensions: Cell Dimensions: a = 6.668, b = 9.879, c = 9.883, Z = 1; alpha = 73.53°, beta = 85.6°, gamma = 86.93° V = 621.58 Den(Calc)= 2.83
Help on Crystal System: Crystal System: Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 5.92(1), 2.784(0.86), 3.17(0.53),9.47(0.41), 3.31(0.34), 2.202(0.32), 2.639(0.3), 2.225(0.26),

Physical Properties of Atencioite

Help on Cleavage: Cleavage: None
Help on Color: Color: Greenish brown.
Help on Density: Density: 2.84 - 2.86, Average = 2.84
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Concretionary - Rounded massive fine-grained materials.
Help on Habit: Habit: Spherical - Spherical, rounded aggregates.
Help on Hardness: Hardness: 4.5 - Between Fluorite and Apatite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Atencioite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.008 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.001 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.219,KPDmeas= 0.2174,KC= 0.2192
Ncalc = 1.62 - 1.63
Help on Optical Data: Optical Data: Biaxial (-), a=1.613, b=1.62, g=1.626, bire=0.0130, 2V(Calc)=84, 2V(Meas)=60. Dispersion dispersion not observed.

Calculated Properties of Atencioite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.81 gm/cc
note: Specific Gravity of Atencioite =2.83 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.04
Boson Index = 0.96
Help on Photoelectric: Photoelectric: PEAtencioite = 5.99 barns/electron
U=PEAtencioite x rElectron Density= 16.86 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Atencioite is Not Radioactive

Atencioite Classification

Help on  Dana Class: Dana Class: (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen
  (42.07)where (AB)5 (XO4)3 Zq � x(H2O)
  (42.07.07)Roscherite group Roscherite Ca(Mn,Fe)5Be4(PO4)6(OH)4•6(H2O) C1 1 Zanazziite Ca2(Mg,Fe)(Mg,Fe,Al,Mn,Fe)4Be4(PO4)6(OH)4•6(H2O) C 2/c 2/m Greifensteinite! Ca2Be4(Fe,Mn)5(PO4)6(OH)4•6(H2O) C 2/c 2/m Atencioite! Ca2Fe[]Mg2Fe2Be4(PO4)6(OH)4•6H2O P1 1 Guimaraesite Ca2(Zn,Mg,Fe)5Be4(PO4)6(OH)4•6H2O C 2/c 2/m Footemineite! Ca2MnMn2Mn2Be4(PO4)6(OH)4•6H2O P1 1 Ruifrancoite! Ca2([],Mn)2(Fe,Mn,Mg)4Be4(PO4)6(OH)4•6H2O C 2/c 2/m
Help on  Strunz Class: Strunz Class: 08.DA.10 08 - PHOSPHATES, ARSENATES, VANADATES
  08.D - Phosphates, etc
  08.DA -With small (and occasionally larger) cations
08.DA.10 Roscherite Ca(Mn,Fe)5Be4(PO4)6(OH)4•6(H2O) C1 1
08.DA.10 Zanazziite Ca2(Mg,Fe)(Mg,Fe,Al,Mn,Fe)4Be4(PO4)6(OH)4•6(H2O) C 2/c 2/m
08.DA.10 Footemineite! Ca2MnMn2Mn2Be4(PO4)6(OH)4•6H2O P1 1
08.DA.10 Atencioite! Ca2Fe[]Mg2Fe2Be4(PO4)6(OH)4•6H2O P1 1
08.DA.10 Greifensteinite! Ca2Be4(Fe,Mn)5(PO4)6(OH)4•6(H2O) C 2/c 2/m
08.DA.10 Ruifrancoite! Ca2([],Mn)2(Fe,Mn,Mg)4Be4(PO4)6(OH)4•6H2O C 2/c 2/m
08.DA.10 Guimaraesite Ca2(Zn,Mg,Fe)5Be4(PO4)6(OH)4•6H2O C 2/c 2/m

Other Atencioite Information

Help on References: References: NAME( Doklady Chemistry, 2004, 398, pp. 191-195) PHYS. PROP.(Doklady Chemistry, 2004, 398, pp. 191-195) OPTIC PROP.(Doklady Chemistry, 2004, 398, pp. 191-195)
Help on See Also: See Also: Links to other databases for Atencioite :
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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Print or Cut-and-Paste your Atencioite Specimen Label here :


Ca2Fe++[ ]Mg2Fe++2Be4(PO4)6(OH)4•6H2O
Dana No: Strunz No: 08.DA.10





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