Brumadoite Mineral Data

General Brumadoite Information

Chemical Formula:

Cu3(TeO4)(OH)4•5H2O

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

Empirical Formula:

Cu_2.9Pb_0.04Ca_0.01Te_0.93Si_0.05O₄(OH)₄•5(H₂O)

IMA Status:

Approved IMA 2008 (Dana # Added)

Locality:

Pedra Preta mine, Serra das eguas, Brumado, Bahia, Brazil Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Synonym:

IMA2008-028

Brumadoite Crystallography

Axial Ratios:

a:b:c =1.4864:1:1.3185

Cell Dimensions:

a = 8.629, b = 5.805, c = 7.654, Z = 2; beta = 103.17° V = 373.32 Den(Calc)= 4.76

Crystal System:

Monoclinic Space Group: P 2₁/m or P 2₁

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

By Intensity(I/I_o): 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

Color:

Blue.

Diaphaneity:

Transparent to Translucent

Luster:

Vitreous (Glassy)

Streak:

pale blue

Optical Properties of Brumadoite

Optical Data:

NCalc= 2.01 - from Gladstone-Dale relationship (KC = 0.2128) where Ncalc=Dcalc*KC+1

Calculated Properties of Brumadoite

Electron Density:

Bulk Density (Electron Density)=4.53 gm/cc
note: Specific Gravity of Brumadoite =4.76 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_Brumadoite= 111.84 barns/electron
U=PE_Brumadoite x rElectron Density= 506.61 barns/cc.

Radioactivity:

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

Brumadoite Classification

Dana Class:

33.02.06.02 (33)Selenates and Tellurates

(33.02)as A+ (B++)m XO6 Zq � x(H2O) where x can equal 0

(33.02.06)Dana Group

33.02.06.01 Jensenite Cu3TeO6•2(H2O) P 2₁/n 2/m

33.02.06.02 Brumadoite! Cu3(TeO4)(OH)4•5H2O P 2₁/m or P 2₁ Mono

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

References:

NAME( MinMag, v72:1201) PHYS. PROP.(MinMag, v72:1201) OPTIC PROP.(MinMag, v72:1201)

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

Brumadoite

Cu3(TeO4)(OH)4•5H2O
Dana No: 33.02.06.02 Strunz No: 07.DE.80
Locality:

Notes: