Barahonaite-(Fe) Mineral Data (original) (raw)
General Barahonaite-(Fe) Information
Chemical Formula:
(Ca,Cu,Na,Fe+++,Al )12Fe+++2(AsO4)8(OH,Cl)x•nH2O
Composition:
Molecular Weight = 2,141.70 gm
Sodium 1.54 % Na 2.07 % Na2O
Calcium 9.26 % Ca 12.96 % CaO
Magnesium 0.08 % Mg 0.13 % MgO
Aluminum 0.91 % Al 1.71 % Al2O3
Iron 9.65 % Fe 13.79 % Fe2O3
Copper 9.91 % Cu 12.41 % CuO
Silicon 0.10 % Si 0.22 % SiO2
Arsenic 26.87 % As 41.21 % As2O5
Phosphorus 0.23 % P 0.53 % P2O5
Hydrogen 1.56 % H 13.97 % H2O
Sulfur 0.12 % S 0.30 % SO3
Chlorine 0.91 % Cl 0.91 % Cl
Oxygen 38.86 % O
______ ______
100.00 % 100.01 % = TOTAL OXIDE
Empirical Formula:
Ca4.95Cu3.34Na1.43Mg0.07Fe3+1.7Al0.72Fe3+28(As0.96)8(P0.02)8(S0.01)8(Si0.01)8(O4)(OH)6.82Cl0.55�13.2(H2O)
Environment:
Occurs in a small lens of sulfides that have been completely oxidized to supergene minerals. Smolianinovite group (?)
IMA Status:
Approved IMA 2006 (Dana # Added)
Locality:
Dolores prospect, Pastrana, Murcia Province, Spain Link to MinDat.org Location Data.
Name Origin:
Named for Antonio Barahona of Madrid who recognized the potential of the Dolores site and provided the original specimens.
Synonym:
IMA2006-052
Barahonaite-(Fe) Image
Images:
SEMSmall.jpg) |
Barahonaite-(Fe) Comments: SEM image of tapered aggregates of bladed barahonaite-(Fe). (CanMin, v46:205). Location: Dolores prospect near the village of Pastrana, in the Province of Murcia of southeastern Spain.Scale: See Image. © Canadian Mineralogist |
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Images:
Small.jpg) |
Barahonaite-(Fe) Conichalcite Comments: Micro yellow, platy barahonaite-(Fe) crystals associated with green "beads" of conichalcite, yellowish, earthy arseniosiderite and micro olivenite crystals. Location: Dolores prospect near the village of Pastrana, in the Province of Murcia of southeastern Spain.Scale: Specimen Size 6 x 4 x 2 cm. © Tom Loomis / Dakota Matrix |
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Barahonaite-(Fe) Crystallography
Axial Ratios:
a:b:c =0.4534:1:0.2356
Cell Dimensions:
a = 10.172, b = 22.43, c = 5.286, Z = 2; beta = 93.09° V = 1,204.29 Den(Calc)= 5.91
Crystal System:
MonoclinicSpace Group: P 2/a or Pa
X Ray Diffraction:
By Intensity(I/Io): 22(1), 11.2(0.7), 2.763(0.3),2.541(0.2), 2.66(0.2), 3.345(0.2), 5.068(0.2),
Physical Properties of Barahonaite-(Fe)
Color:
Greenish yellow.
Density:
3.03
Diaphaneity:
Transparent
Fracture:
Brittle - Generally displayed by glasses and most non-metallic minerals.
Habit:
Rosette - Bundled tabular aggregates resembling rose flower petals.
Luster:
Vitreous (Glassy)
Streak:
white to pale yellow
Optical Properties of Barahonaite-(Fe)
Gladstone-Dale:
CI meas= -0.016 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.479 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1138,KPDmeas= 0.222,KC= 0.2186
Ncalc = 1.66 - 2.29
Optical Data:
Biaxial (-), a=1.664, b=1.677, g=1.677, bire=0.0130
Calculated Properties of Barahonaite-(Fe)
Electron Density:
Bulk Density (Electron Density)=2.93 gm/cc
note: Specific Gravity of Barahonaite-(Fe) =3.03 gm/cc.
Fermion Index:
Fermion Index = 0.0024967419
Boson Index = 0.9975032581
Photoelectric:
PEBarahonaite-(Fe) = 26.58 barns/electron
U=PEBarahonaite-(Fe) x rElectron Density= 77.83 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Barahonaite-(Fe) is Not Radioactive
Barahonaite-(Fe) Classification
Dana Class:
40.05.08.03 (40)Hydrated Phosphates, etc
(40.05)with miscellaneous formulae
(40.05.08)Smolianinovite Group
40.05.08.01 Smolianinovite (Co,Ni,Mg,Ca)3(Fe,Al)2(AsO4)4•11(H2O) Unk Ortho
40.05.08.02 Fahleite Zn5CaFe2(AsO4)6•14(H2O) Unk Ortho
40.05.08.03 Barahonaite-(Fe)! (Ca,Cu,Na,Fe,Al)12Fe2(AsO4)8(OH,Cl)x•nH2O P 2/a or Pa Mono
40.05.08.04 Barahonaite-(Al)! (Ca,Cu,Na,Fe,Al)12Al2(AsO4)8(OH,Cl)x•nH2O P 2/a or Pa Mono
Strunz Class:
08.CH.60 08 - PHOSPHATES, ARSENATES, VANADATES
08.C - Phosphates without Additional Anions, with H2O
08.CH -With large and medium-sized cations, RO4:H2O < 1:1
08.CH.60 Barahonaite-(Fe)! (Ca,Cu,Na,Fe,Al)12Fe2(AsO4)8(OH,Cl)x•nH2O P 2/a or Pa Mono
08.CH.60 Barahonaite-(Al)! (Ca,Cu,Na,Fe,Al)12Al2(AsO4)8(OH,Cl)x•nH2O P 2/a or Pa Mono
Other Barahonaite-(Fe) Information
References:
NAME( AmMin, v93:1941) PHYS. PROP.(AmMin, v93:1941) OPTIC PROP.(AmMin, v93:1941)
See Also:
Links to other databases for Barahonaite-(Fe) :
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 Barahonaite-(Fe) Specimen Label here :
Barahonaite-(Fe)
(Ca,Cu,Na,Fe+++,Al )12Fe+++2(AsO4)8(OH,Cl)x•nH2O
Dana No: 40.05.08.03 Strunz No: 08.CH.60
Locality:
Notes: