Atencioite Mineral Data (original) (raw)
General Atencioite Information
Chemical Formula:
Ca2Fe++[ ]Mg2Fe++2Be4(PO4)6(OH)4•6H2O
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
Empirical Formula:
Ca1.87Mg2.24Mn2+0.19Fe2+1.98Fe3+0.52Al0.08Be3.93(PO4)6(OH)4.22�5.63(H2O)
Environment:
Occurs in granite pegmatite. Related to roscherite.
IMA Status:
Approved IMA 2004 (Dana # Added)
Locality:
Linopolis, Divino das Laranjeiras, Minas Gerais State, Brazil Link to MinDat.org Location Data.
Name Origin:
Named for Dr. Daniel Atencio, professor of mineralogy at the Geoscience Institute of the University of S�o Paulo, Brazil.
Synonym:
IMA2004-041
Atencioite Image
Images:
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Atencioite Comments: Nodule of tan atenciote. Location: Pomaroli Mine, Linópolis,Minas Gerais, Brazil.Scale: Specimen size 1 cm. © Adam Larson |
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Atencioite Crystallography
Axial Ratios:
a:b:c =0.6749:1:1.0004
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
Crystal System:
Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1
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
Cleavage:
None
Color:
Greenish brown.
Density:
2.84 - 2.86, Average = 2.84
Diaphaneity:
Transparent
Fracture:
Brittle - Generally displayed by glasses and most non-metallic minerals.
Habit:
Concretionary - Rounded massive fine-grained materials.
Habit:
Spherical - Spherical, rounded aggregates.
Hardness:
4.5 - Between Fluorite and Apatite
Luster:
Vitreous (Glassy)
Streak:
white
Optical Properties of Atencioite
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
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
Electron Density:
Bulk Density (Electron Density)=2.81 gm/cc
note: Specific Gravity of Atencioite =2.83 gm/cc.
Fermion Index:
Fermion Index = 0.04
Boson Index = 0.96
Photoelectric:
PEAtencioite = 5.99 barns/electron
U=PEAtencioite x rElectron Density= 16.86 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Atencioite is Not Radioactive
Atencioite Classification
Dana Class:
42.07.07.05 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen
(42.07)where (AB)5 (XO4)3 Zq � x(H2O)
(42.07.07)Roscherite group
42.07.07.01 Roscherite Ca(Mn,Fe)5Be4(PO4)6(OH)4•6(H2O) C1 1
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
42.07.07.04 Greifensteinite! Ca2Be4(Fe,Mn)5(PO4)6(OH)4•6(H2O) C 2/c 2/m
42.07.07.05 Atencioite! Ca2Fe[]Mg2Fe2Be4(PO4)6(OH)4•6H2O P1 1
42.07.07.06 Guimaraesite Ca2(Zn,Mg,Fe)5Be4(PO4)6(OH)4•6H2O C 2/c 2/m
42.07.07.07 Footemineite! Ca2MnMn2Mn2Be4(PO4)6(OH)4•6H2O P1 1
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
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
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)
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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Atencioite
Ca2Fe++[ ]Mg2Fe++2Be4(PO4)6(OH)4•6H2O
Dana No: 42.07.07.05 Strunz No: 08.DA.10
Locality:
Notes: