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Barbosalite Mineral Data

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General Barbosalite Information

Help on Chemical  Formula: Chemical Formula: Fe++Fe+++2(PO4)2(OH)2
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Fe2+Fe3+2(PO4)2(OH)2
Help on Environment: Environment: In complex granitic pegmatites, formed by oxidation and hydration of primary.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1955
Help on Locality: 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.
Help on Name Origin: Name Origin: Named for Aluxio Licinio de Miranda Barbosa (1916- ), Professor of Geology, School of Mines, Ouro Preto, Brazil.
Help on Name Pronunciation: Name Pronunciation: Barbosalite + Pronunciation Say BARBOSALITE
Help on Synonym: Synonym: ICSD 71016
  PDF 33-668

Barbosalite Image

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

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  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

Help on Axial Ratios: Axial Ratios: a:b:c =0.9718:1:1.004
Help on Cell Dimensions: Cell Dimensions: a = 7.25, b = 7.46, c = 7.49, Z = 2; beta = 120.25° V = 349.94 Den(Calc)= 3.72
Help on Crystal System: 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/Io): 3.361(1), 3.313(0.8), 4.84(0.6),

Physical Properties of Barbosalite

Help on Cleavage: Cleavage: None
Help on Color: Color: Blue green, Green blue, Greenish black, Black.
Help on Density: Density: 3.6
Help on Diaphaneity: Diaphaneity: Translucent to Opaque
Help on Hardness: Hardness: 5.5-6 - Knife Blade-Orthoclase
Help on Luster: Luster: Vitreous - Dull

Optical Properties of Barbosalite

Help on Gladstone-Dale: 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
Help on Optical Data: Optical Data: Biaxial (+), a=1.77, g=1.835, bire=0.0650, 2V(Meas)=70.

Calculated Properties of Barbosalite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.49 gm/cc
note: Specific Gravity of Barbosalite =3.60 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0092694342
Boson Index = 0.9907305658
Help on Photoelectric: Photoelectric: PEBarbosalite = 13.60 barns/electron
U=PEBarbosalite x rElectron Density= 47.54 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Barbosalite is Not Radioactive

Barbosalite Classification

Help on  Dana Class: Dana Class: (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen
  (41.10)where (A++ B++)3 (XO4)2 Zq
  (41.10.01)Lazulite Group Lazulite MgAl2(PO4)2(OH)2 P 21/c 2/m Scorzalite (Fe,Mg)Al2(PO4)2(OH)2 P 2/c 2/m Hentschelite CuFe2(PO4)2(OH)2 P 21/n 2/m Barbosalite FeFe2(PO4)2(OH)2 P 21/c 2/m
Help on  Strunz Class: 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 � 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

Help on References: References: NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: 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

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Dana No: Strunz No: 08.BB.40





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