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Brumadoite Mineral Data

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General Brumadoite Information

Help on Chemical  Formula: Chemical Formula: Cu3(TeO4)(OH)4•5H2O
Help on Composition: Composition: Molecular Weight = 535.15 gm
   Calcium     0.07 %  Ca    0.10 % CaO
   Copper     34.44 %  Cu   43.11 % CuO
   Silicon     0.26 %  Si    0.56 % SiO2
   Tellurium  22.17 %  Te   27.74 % TeO2
   Hydrogen    2.64 %  H    23.56 % H2O
   Lead        1.55 %  Pb    1.67 % PbO
   Oxygen     38.87 %  O
             ______        ______ 
             100.00 %       96.74 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Cu2.9Pb0.04Ca0.01Te0.93Si0.05O4(OH)4•5(H2O)
Help on IMA Status: IMA Status: Approved IMA 2008 (Dana # Added)
Help on Locality: Locality: Pedra Preta mine, Serra das eguas, Brumado, Bahia, Brazil Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Synonym: Synonym: IMA2008-028

Brumadoite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.4864:1:1.3185
Help on Cell Dimensions: Cell Dimensions: a = 8.629, b = 5.805, c = 7.654, Z = 2; beta = 103.17° V = 373.32 Den(Calc)= 4.76
Help on Crystal System: Crystal System: Monoclinic Space Group: P 21/m or P 21
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 8.432(1), 3.162(0.66), 2.385(0.27),1.666(0.14), 2.291(0.12), 1.916(0.11), 1.45(0.1), 1.452(0.1),

Physical Properties of Brumadoite

Help on Color: Color: Blue.
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: pale blue

Optical Properties of Brumadoite

Help on Optical Data: Optical Data: NCalc= 2.01 - from Gladstone-Dale relationship (KC = 0.2128) where Ncalc=Dcalc*KC+1

Calculated Properties of Brumadoite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.53 gm/cc
note: Specific Gravity of Brumadoite =4.76 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PEBrumadoite = 111.84 barns/electron
U=PEBrumadoite x rElectron Density= 506.61 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Brumadoite is Not Radioactive

Brumadoite Classification

Help on  Dana Class: Dana Class: (33)Selenates and Tellurates
  (33.02)as A+ (B++)m XO6 Zq � x(H2O) where x can equal 0
  (33.02.06)Dana Group Jensenite Cu3TeO6•2(H2O) P 21/n 2/m Brumadoite! Cu3(TeO4)(OH)4•5H2O P 21/m or P 21 Mono
Help on  Strunz Class: Strunz Class: 07.DE.80 07 - SULFATES (SELENATES, TELLURATES)
  07.D - Sulfates (selenates, etc.) with additional anions, with H2O
  07.DE -With only medium-sized cations; unclassified
07.DE.80 Brumadoite! Cu3(TeO4)(OH)4•5H2O P 21/m or P 21 Mono

Other Brumadoite Information

Help on References: References: NAME( MinMag, v72:1201) PHYS. PROP.(MinMag, v72:1201) OPTIC PROP.(MinMag, v72:1201)
Help on See Also: See Also: Links to other databases for Brumadoite :
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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Dana No: Strunz No: 07.DE.80