Barbosalite Mineral Data

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.

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:

Barbosalite Phosphosiderite

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 - PrismaticH-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),

Crystal Structure:

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Redhammer G J , Tippelt G , Roth G , Lottermoser W , Amthauer G , Physics and Chemistry of Minerals , 27 (2000) p.419-429, Structure and Mossbauer spectroscopy of barbosalite Fe2+Fe3+2(PO4)2(OH)2, between 80 K and 300 K, Sample: T = 298 K

View Additional jPOWD Structure files for Barbosalite
[1]

Physical Properties of Barbosalite

Cleavage:

None

Color:

Blue green, Green blue, Greenish black, Black.

Density:

3.6

Diaphaniety:

Translucent to Opaque

Hardness:

5.5-6 - Knife Blade-Orthoclase

Luster:

Vitreous - Dull

Optical Properties of Barbosalite

Optical Data:

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

Calculated Properties of Barbosalite

Electron Density:

r_electron=3.61 gm/cc
note: r_Barbosalite=3.72 gm/cc.

Fermion Index

Fermion Index = 0.00926
Boson Index = 0.99074

Photoelectric:

PE_Barbosalite= 13.60 barns/electron
U=PE_Barbosalite x r_electron= 49.12 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Barbosalite is Not Radioactive

Barbosalite Classification

Dana Class:

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

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

(41.10.1)Dana Group

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

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

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

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

Strunz Class:

VII/B.08-40 VII - Phosphates, Arsenates and Vanadates

VII/B - Waterfree phosphates with unfamiliar anions F, Cl, O,OH, cations of medium size: Mg, Mn, Fe, Cu, Zn, Pseudomalachite group and related compounds

VII/B.08 - Lazulite group, Trolleite - Richellite

VII/B.08-10 Trolleite Al4(PO4)3(OH)3 I2/c 2/m

VII/B.08-20 Lazulite MgAl2(PO4)2(OH)2 P 2₁/c 2/m

VII/B.08-30 Scorzalite (Fe,Mg)Al2(PO4)2(OH)2 P 2/c 2/m

VII/B.08-40 Barbosalite FeFe2(PO4)2(OH)2 P 2₁/c 2/m

VII/B.08-50 Hentschelite CuFe2(PO4)2(OH)2 P 2₁/n 2/m

VII/B.08-55 Wilhelmkleinite! ZnFe3(AsO4)2(OH)2 P 2₁/n 2/m

VII/B.08-60 Lipscombite (Fe,Mn)Fe2(PO4)2(OH)2 P 4₁2₁2 4 2 2

VII/B.08-70 Richellite Ca3Fe10(PO4)8(OH)12·n(H2O) P 4 4

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 - Crocoite.com Mineral Locations 4 - EUROmin Project 5 -Google Images 6 -Google Scholar 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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Barbosalite

Fe++Fe+++2(PO4)2(OH)2
Dana No: 41.10.1.4 Strunz No: VII/B.08-40
Locality:

Notes: