Barahonaite-(Fe) Mineral Data

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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

- % Cl -0.21 % -O=Cl₂

Oxygen 38.86 % O

______ ______

100.00 % 100.01 % = TOTAL OXIDE

Empirical Formula:

Ca_4.95Cu_3.34Na_1.43Mg_0.07Fe³⁺_1.7Al_0.72Fe³⁺₂8(As_0.96)8(P_0.02)8(S_0.01)8(Si_0.01)8(O₄)(OH)_6.82 Cl_0.55·13.2(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:

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

Images:

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

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

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

By Intensity(I/I_o): 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:

PE_{Barahonaite-(Fe)}= 26.58 barns/electron
U=PE_{Barahonaite-(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: