Mineralogy Database

Barahonaite-(Al) Mineral Data

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General Barahonaite-(Al) Information

Help on Chemical  Formula: Chemical Formula: (Ca,Cu,Na,Fe+++,Al )12Al2(AsO4)8(OH,Cl)x•nH2O
Help on Composition: Composition: Molecular Weight = 2,052.55 gm
   Sodium       1.22 %  Na    1.65 % Na2O
   Calcium     11.23 %  Ca   15.71 % CaO
   Aluminum     5.05 %  Al    9.54 % Al2O3
   Iron         0.08 %  Fe    0.12 % Fe2O3
   Copper      11.67 %  Cu   14.61 % CuO
   Silicon      0.11 %  Si    0.23 % SiO2
   Arsenic     27.45 %  As   42.10 % As2O5
   Phosphorus   0.12 %  P     0.28 % P2O5
   Hydrogen     1.62 %  H    14.46 % H2O
   Sulfur       0.50 %  S     1.25 % SO3
   Chlorine     0.07 %  Cl    0.07 % Cl
                 -   %   Cl   -0.02 % -O=Cl2   
   Oxygen      40.88 %  O
              ______        ______ 
              100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: 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)
Help on Environment: Environment: Occurs in a small lens of sulfides that have been completely oxidized to supergene minerals. Smolianinovite group (?)
Help on IMA Status: IMA Status: Approved IMA 2008 (Dana # Added)
Help on Locality: Locality: Dolores prospect, Pastrana, Murcia Province, Spain Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for its relationship with barahonaite-(Fe).
Help on Synonym: Synonym: IMA2006-051

Barahonaite-(Al) Image

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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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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

Barahonaite-(Al) Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.4538:1:0.4709
Help on Cell Dimensions: Cell Dimensions: a = 10.161, b = 22.39, c = 10.545, Z = 2; beta = 93.3° V = 2,395.06 Den(Calc)= 2.85
Help on Crystal System: Crystal System: Monoclinic Space Group: P 2/a or Pa
Help on X Ray Diffraction: 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),

Physical Properties of Barahonaite-(Al)

Help on Color: Color: Pale blue.
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Barahonaite-(Al)

Help on Gladstone-Dale: Gladstone-Dale: CI calc= -0.076 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2172,KC= 0.2019
Ncalc = 1.58
Help on Optical Data: Optical Data: Biaxial (-), a=1.616, g=1.622, bire=0.0060

Calculated Properties of Barahonaite-(Al)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.77 gm/cc
note: Specific Gravity of Barahonaite-(Al) =2.85 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0004561596
Boson Index = 0.9995438404
Help on Photoelectric: Photoelectric: PEBarahonaite-(Al) = 25.08 barns/electron
U=PEBarahonaite-(Al) x rElectron Density= 69.37 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Barahonaite-(Al) is Not Radioactive

Barahonaite-(Al) Classification

Help on  Dana Class: Dana Class: (40)Hydrated Phosphates, etc
  (40.05)with miscellaneous formulae
  (40.05.08)Smolianinovite Group Smolianinovite (Co,Ni,Mg,Ca)3(Fe,Al)2(AsO4)4•11(H2O) Unk Ortho Fahleite Zn5CaFe2(AsO4)6•14(H2O) Unk Ortho Barahonaite-(Fe)! (Ca,Cu,Na,Fe,Al)12Fe2(AsO4)8(OH,Cl)x•nH2O P 2/a or Pa Mono Barahonaite-(Al)! (Ca,Cu,Na,Fe,Al)12Al2(AsO4)8(OH,Cl)x•nH2O P 2/a or Pa Mono
Help on  Strunz Class: 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-(Al) Information

Help on References: References: NAME( AmMin, v93:1941) PHYS. PROP.(AmMin, v93:1941) OPTIC PROP.(AmMin, v93:1941)
Help on See Also: 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 :


(Ca,Cu,Na,Fe+++,Al )12Al2(AsO4)8(OH,Cl)x•nH2O
Dana No: Strunz No: 08.CH.60





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