Barahonaite-(Al) Mineral Data

General Barahonaite-(Al) Information

Chemical Formula:

(Ca,Cu,Na,Fe+++,Al )12Al2(AsO4)8(OH,Cl)x•nH2O

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

Empirical Formula:

Ca_5.75Cu_3.77Na_1.09Al_1.84Fe³⁺_0.03Al₂8(As_0.94)8(S_0.04)8(P_0.01)8(O₄)8(Si_0.01)(OH)_7.95Cl_0.04·12.5(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

Barahonaite-(Al) Image

Images:

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

Images:

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

Barahonaite-(Al) Crystallography

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:

MonoclinicSpace Group: P 2/a or Pa

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 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)

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

Optical Properties of Barahonaite-(Al)

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

Calculated Properties of Barahonaite-(Al)

Electron Density:

Bulk Density (Electron Density)=2.77 gm/cc
note: Specific Gravity of Barahonaite-(Al) =2.85 gm/cc.

Fermion Index:

Fermion Index = 0.0004561596
Boson Index = 0.9995438404

Photoelectric:

PE_{Barahonaite-(Al)}= 25.08 barns/electron
U=PE_{Barahonaite-(Al)} x rElectron Density= 69.37 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Barahonaite-(Al) is Not Radioactive

Barahonaite-(Al) Classification

Dana Class:

40.05.08.04 (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-(Al) Information

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 :

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: