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 % Fe2 O3
Phosphorus 15.82 % P 36.26 % P2 O5
Hydrogen 0.51 % H 4.60 % H2 O
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:
Images:
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
X Ray Diffraction:
By Intensity(I/Io ): 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:
PEBarbosalite = 13.60 barns/electronU=PEBarbosalite x r Electron 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 � 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:
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