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Barahonaite-(Al) Mineral Data
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General Barahonaite-(Al) Information
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 Chemical Formula: |
(Ca,Cu,Na,Fe+++,Al )12Al2(AsO4)8(OH,Cl)x•nH2O |
| Composition: |
Molecular Weight = 2,052.55 gm |
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Sodium 1.22 % Na 1.65 % Na2O |
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Calcium 11.23 % Ca 15.71 % CaO |
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Aluminum 5.05 % Al 9.54 % Al2O3 |
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Iron 0.08 % Fe 0.12 % Fe2O3 |
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Copper 11.67 % Cu 14.61 % CuO |
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Silicon 0.11 % Si 0.23 % SiO2 |
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Arsenic 27.45 % As 42.10 % As2O5 |
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Phosphorus 0.12 % P 0.28 % P2O5 |
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Hydrogen 1.62 % H 14.46 % H2O |
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Sulfur 0.50 % S 1.25 % SO3 |
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Chlorine 0.07 % Cl 0.07 % Cl |
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- %
Cl -0.02 % -O=Cl2 |
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Oxygen 40.88 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
| Empirical Formula: |
Ca5.75Cu3.77Na1.09Al1.84Fe3+0.03Al28(As0.94)8(S0.04)8(P0.01)8(O4)8(Si0.01)(OH)7.95Cl0.04�12.5(H2O) |
| Environment: |
Occurs in a small lens of sulfides that have been completely oxidized to supergene minerals. Smolianinovite group (?) |
| IMA Status: |
Approved IMA 2008 (Dana # Added) |
| Locality: |
Dolores prospect, Pastrana, Murcia Province, Spain Link to MinDat.org Location Data. |
| Name Origin: |
Named for its relationship with barahonaite-(Fe). |
| Synonym: |
IMA2006-051 |
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Barahonaite-(Al) Image |
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Images:
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Small.jpg)
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Barahonaite-(Al)
Comments: Blue botryodal encrustations of barahonaite-(Al) in a gossanous matrix.
Location: 80' level, Gold Hill Mine (Western Utah Mine), Gold Hill, Gold Hill District (Clifton District), Deep Creek Mtns, Tooele County, Utah, USA.
Scale: Specimen Size 1 x 0.7 cm.
© Jim McEwen / Lehigh Minerals |
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Images:
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SEMSmall.jpg)
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Barahonaite-(Al)
Comments: SEM images of barahonaite-(Al) showing the boxwork-like form of the surface of one of the beads. (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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Barahonaite-(Al) Crystallography
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| Axial Ratios: |
a:b:c =0.4538:1:0.4709 |
| Cell Dimensions: |
a = 10.161, b = 22.39, c = 10.545, Z = 2; beta = 93.3° V = 2,395.06 Den(Calc)= 2.85 |
| Crystal System: |
Monoclinic Space Group: P 2/a or Pa |
| X Ray Diffraction: |
By Intensity(I/Io): 22(1), 11.16(0.7), 4.983(0.5),3.333(0.45), 2.767(0.3), 3.003(0.3), 3.655(0.25), |
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Physical Properties of Barahonaite-(Al)
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| Color: |
Pale blue. |
| Diaphaneity: |
Transparent |
| Fracture: |
Brittle - Generally displayed by glasses and most non-metallic minerals. |
| Habit: |
Tabular - Form dimensions are thin in one direction. |
| Luster: |
Vitreous (Glassy) |
| Streak: |
white |
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Optical Properties of Barahonaite-(Al)
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| Gladstone-Dale: |
CI calc= -0.076 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2172,KC= 0.2019
Ncalc = 1.58 |
| Optical Data: |
Biaxial (-), a=1.616, g=1.622, bire=0.0060 |
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Calculated Properties of Barahonaite-(Al)
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| Electron Density: |
Bulk Density (Electron Density)=2.77 gm/cc
note: Specific Gravity of Barahonaite-(Al) =2.85 gm/cc.
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| Fermion Index: |
Fermion Index = 0.0004561596
Boson Index = 0.9995438404 |
| Photoelectric: |
PEBarahonaite-(Al) = 25.08 barns/electron
U=PEBarahonaite-(Al) x rElectron Density= 69.37 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Barahonaite-(Al) is Not Radioactive |
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Barahonaite-(Al) Classification
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| Dana Class: |
40.05.08.04 (40)Hydrated Phosphates, etc |
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(40.05)with miscellaneous formulae |
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(40.05.08)Smolianinovite Group |
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40.05.08.01 Smolianinovite (Co,Ni,Mg,Ca)3(Fe,Al)2(AsO4)4•11(H2O) Unk Ortho |
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40.05.08.02 Fahleite Zn5CaFe2(AsO4)6•14(H2O) Unk Ortho |
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40.05.08.03 Barahonaite-(Fe)! (Ca,Cu,Na,Fe,Al)12Fe2(AsO4)8(OH,Cl)x•nH2O P 2/a or Pa Mono |
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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 |
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08.C - Phosphates without Additional Anions, with H2O |
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08.CH -With large and medium-sized cations, RO4:H2O < 1:1 |
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08.CH.60 Barahonaite-(Fe)! (Ca,Cu,Na,Fe,Al)12Fe2(AsO4)8(OH,Cl)x•nH2O P 2/a or Pa Mono |
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08.CH.60 Barahonaite-(Al)! (Ca,Cu,Na,Fe,Al)12Al2(AsO4)8(OH,Cl)x•nH2O P 2/a or Pa Mono |
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Other Barahonaite-(Al) Information
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| References: |
NAME( AmMin, v93:1941) PHYS. PROP.(AmMin, v93:1941) OPTIC PROP.(AmMin, v93:1941) |
| See Also: |
Links to other databases for Barahonaite-(Al) :
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-(Al) Specimen Label here :
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Barahonaite-(Al)
(Ca,Cu,Na,Fe+++,Al )12Al2(AsO4)8(OH,Cl)x•nH2O
Dana No: 40.05.08.04 Strunz No: 08.CH.60
Locality:
Notes:
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