Barbosalite Mineral Data

General Barbosalite Information

Chemical Formula:

Fe++Fe+++2(PO4)2(OH)2

Composition:

Molecular Weight = 391.50 gm

Iron 42.79 % Fe 18.35 % FeO / 40.79 % Fe₂O₃

Phosphorus 15.82 % P 36.26 % P₂O₅

Hydrogen 0.51 % H 4.60 % H₂O

Oxygen 40.87 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Fe²⁺Fe³⁺₂(PO₄)₂(OH)₂

Environment:

In complex granitic pegmatites, formed by oxidation and hydration of primary.

IMA Status:

Valid Species (Pre-IMA) 1955

Locality:

In Brazil, in Minas Gerais, at the Sapucaia pegmatite mine, about 50 km east-southeast of Govenador Valdares, and in good crystals from the Criminoso pegmatite mine, about 35 km north Link to MinDat.org Location Data.

Name Origin:

Named for Aluxio Licinio de Miranda Barbosa (1916- ), Professor of Geology, School of Mines, Ouro Preto, Brazil.

Name Pronunciation:

Barbosalite + Pronunciation

Synonym:

ICSD 71016

PDF 33-668

Barbosalite Image

Images:

Barbosalite

Comments: Black, cruciform quadrilling twins of barbosalite crystals.
Location: Sapucaia, Mina Gerais, Brazil. Scale: Size Not Given.
© Lou Perloff / Photo Atlas of Minerals

Images:

Phosphosiderite Barbosalite

Comments: Transparent, brown crystal of phosphosiderite on black barbosalite.
Location: Bull Moose mine, Custer, Custer County, South Dakota, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Barbosalite Crystallography

Axial Ratios:

a:b:c =0.9718:1:1.004

Cell Dimensions:

a = 7.25, b = 7.46, c = 7.49, Z = 2; beta = 120.25° V = 349.94 Den(Calc)= 3.72

Crystal System:

Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 2₁/c

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

By Intensity(I/I_o): 3.361(1), 3.313(0.8), 4.84(0.6),

Physical Properties of Barbosalite

Cleavage:

None

Color:

Blue green, Green blue, Greenish black, Black.

Density:

3.6

Diaphaneity:

Translucent to Opaque

Hardness:

5.5-6 - Knife Blade-Orthoclase

Luster:

Vitreous - Dull

Optical Properties of Barbosalite

Gladstone-Dale:

CI meas= 0.09 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.119 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2157,KPDmeas= 0.2229,KC= 0.245
Ncalc = 1.88 - 1.91

Optical Data:

Biaxial (+), a=1.77, g=1.835, bire=0.0650, 2V(Meas)=70.

Calculated Properties of Barbosalite

Electron Density:

Bulk Density (Electron Density)=3.49 gm/cc
note: Specific Gravity of Barbosalite =3.60 gm/cc.

Fermion Index:

Fermion Index = 0.0092694342
Boson Index = 0.9907305658

Photoelectric:

PE_Barbosalite= 13.60 barns/electron
U=PE_Barbosalite x rElectron Density= 47.54 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Barbosalite is Not Radioactive

Barbosalite Classification

Dana Class:

41.10.01.04 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen

(41.10)where (A++ B++)3 (XO4)2 Zq

(41.10.01)Lazulite Group

41.10.01.01 Lazulite MgAl2(PO4)2(OH)2 P 2₁/c 2/m

41.10.01.02 Scorzalite (Fe,Mg)Al2(PO4)2(OH)2 P 2/c 2/m

41.10.01.03 Hentschelite CuFe2(PO4)2(OH)2 P 2₁/n 2/m

41.10.01.04 Barbosalite FeFe2(PO4)2(OH)2 P 2₁/c 2/m

Strunz Class:

08.BB.40 08 - PHOSPHATES, ARSENATES, VANADATES

08.B - Phosphates, etc. with Additional Anions, without H2O

08.BB -With only medium-sized cations, (OH, etc.):RO4 ï¿½ 1:1

08.BB.40 Barbosalite FeFe2(PO4)2(OH)2 P 2₁/c 2/m

08.BB.40 Wilhelmkleinite! ZnFe3(AsO4)2(OH)2 P 2₁/n 2/m

08.BB.40 Hentschelite CuFe2(PO4)2(OH)2 P 2₁/n 2/m

08.BB.40 Lazulite MgAl2(PO4)2(OH)2 P 2₁/c 2/m

08.BB.40 Scorzalite (Fe,Mg)Al2(PO4)2(OH)2 P 2/c 2/m

Other Barbosalite Information

References:

NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Barbosalite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - MinDAT
10 - Mineralienatlas (Deutsch)
11 - Online Mineral Museum
12 - QUT Mineral Atlas
13 - Ruff.Info
14 - WWW-MINCRYST

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Print or Cut-and-Paste your Barbosalite Specimen Label here :

Barbosalite

Fe++Fe+++2(PO4)2(OH)2
Dana No: 41.10.01.04 Strunz No: 08.BB.40
Locality:

Notes:

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