Mineralogy Database

Bravoite Mineral Data

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General Bravoite Information

Help on Chemical  Formula: Chemical Formula: (Fe,Ni,Co)S2
Help on Composition: Composition: Molecular Weight = 120.86 gm
   Iron    32.35 %  Fe
   Cobalt   4.88 %  Co
   Nickel   9.71 %  Ni
   Sulfur  53.06 %  S
          100.00 % 
Help on Empirical Formula: Empirical Formula: Fe2+0.7Ni0.2Co0.1S2
Help on Environment: Environment: Nickel-rich variety of pyrite which is gray in color.
Help on IMA Status: IMA Status: Discredited IMA 1989 - Valid Species (Pre-IMA) 1907
Help on Locality: Locality: Gey, Rhineland-Palatinate, Germany. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for J. J. Bravo (1874-1928), Peruvian scientist.
Help on Name Pronunciation: Name Pronunciation: Bravoite Say BRAVOITE
Help on Synonym: Synonym: ICSD 40329
  Nickelian Pyrite
  PDF 3-1131

Bravoite Image

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Comments: Steel gray, metallic crystal of bravoite on brassy yellow chalcopyrite.
Location: Gey, Rhineland-Palatinate, Germany. Scale: Size Not Given.
© Lou Perloff / Photo Atlas of Minerals

Bravoite Crystallography

Help on Cell Dimensions: Cell Dimensions: a = 5.58, Z = 4; V = 173.74 Den(Calc)= 4.62
Help on Crystal System: Crystal System: Isometric - Diploidal H-M Symbol (2/m 3) Space Group: P a3
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 1.68(1)(113), 2.79(0.96)(200), 1.97(0.52)(220),2.49(0.49)(210), 2.27(0.41)(112), 3.21(0.41)(111), 1.61(0.16)(222),
Help on Forms: Forms:

Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize

S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu

Help on Above

Forms: ( 1 0 0) ( 1 0 2)

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Physical Properties of Bravoite

Help on Cleavage: Cleavage: None
Help on Color: Color: Steel gray.
Help on Density: Density: 5 - 5.02, Average = 5.01
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Help on Habit: Habit: Druse - Crystal growth in a cavity which results in numerous crystal tipped surfaces.
Help on Habit: Habit: Stalactitic - Shaped like pendant columns as stalactites or stalagmites (e.g. calcite).
Help on Habit: Habit: Striated - Parallel lines on crystal surface or cleavage face.
Help on Hardness: Hardness: 6.5 - Pyrite
Help on Luster: Luster: Metallic
Help on Streak: Streak: black

Optical Properties of Bravoite

Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Bravoite in Air
λ R  ∑ R(λ) 
 400 nm   36.20   
 420 nm   35.60 
 440 nm   35.00 
 460 nm   34.60 
 480 nm   34.70 
 500 nm   35.00 
 520 nm   35.60 
 540 nm   36.30 
 560 nm   36.80 
 580 nm   37.40 
 600 nm   38.00 
 620 nm   38.70 
 640 nm   39.40 
 660 nm   40.20 
 680 nm   40.80 
 700 nm   41.20 
Calculated Relative Intensity Colors of Bravoite in Air
   0%   30%   60%   90% 100% 120% 150% 180% 210% 240% 250%

Calculated Properties of Bravoite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.47 gm/cc
note: Specific Gravity of Bravoite =4.62 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEBravoite = 18.13 barns/electron
U=PEBravoite x rElectron Density= 81.10 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Bravoite is Not Radioactive

Bravoite Classification

Help on  Dana Class: Dana Class: (02)Sulfide Minerals
  (02.00)Without Dana Classification Numbers
  (02.00.00)Pyrite Group Argentite* Ag2S I m3m 4/m 3 2/m Bayankhanite? Cu6HgS4 Unk Hex Bismutoplagionite* 5PbS.4Bi2S3 Unk Ortho Bravoite? (Fe,Ni,Co)S2 P a3 2/m 3 Colimaite K3VS4 P nma 2/m 2/m 2/m Dayingite* CuCoPtS4 F m3m 4/m 3 2/m Dilithium* Li2Te P 222 2 2 2 Dzhezkazganite* (Pb,Cu,Rh)S2(?) P a3? 2/m 3 Ferdisilicite* FeSi2 P 4/mmm 4/m 2/m 2/m Fersilicite* FeSi P 213 2 3 Horobetsuite* (Bi,Sb)2S3 Pbnm 2/m 2/m 2/m Horomanite Fe6Ni3S8 P 4/mmm 4mm Imgreite? NiTe P 63/mmc 6/m 2/m 2/m Iridisite* (Ir,Cu,Rh,Ni,Pt)S2 Unk Cubic Isochalcopyrite? Cu8Fe9S16 Unk Cubic Jaipurite* CoS P 63/mmc 6/m 2/m 2/m Kitaibelite? Ag10PbBi30S51 Mono ? Mono Kurilite? (Ag,Au)2(Te,Se,S) P m3n,P 43n Cubic Plumosite* Pb2Sb2S5 Mono Protojoseite* Bi4TeS2(?) R 3m 3 2/m Samaniite Cu2Fe5Ni2S8 P 41/mmm 4mm Stibioenargite* Cu3(Sb,As)S4 Unk Ortho Sztrokayite* Bi3TeS2 Trig ? Trig Volfsonite* Cu10CuFeFe2Sn3S16 P 42m-,P 4212 Tetra
Help on  Strunz Class: Strunz Class: 02.XX.00 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf
  02.X - Unclassified Strunz SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarse
  02.XX -Pyrite Group
02.XX.00 Isochalcopyrite? Cu8Fe9S16 Unk Cubic
02.XX.00 Bayankhanite? Cu6HgS4 Unk Hex
02.XX.00 Bravoite? (Fe,Ni,Co)S2 P a3 2/m 3
02.XX.00 Dzhezkazganite* (Pb,Cu,Rh)S2(?) P a3? 2/m 3
02.XX.00 Dilithium* Li2Te P 222 2 2 2
02.XX.00 Horobetsuite* (Bi,Sb)2S3 Pbnm 2/m 2/m 2/m
02.XX.00 Horsfordite? Cu5Sb Unk Cubic
02.XX.00 Kurilite? (Ag,Au)2(Te,Se,S) P m3n,P 43n Cubic
02.XX.00 Imgreite? NiTe P 63/mmc 6/m 2/m 2/m
02.XX.00 Matraite? ZnS R 3m 3m
02.XX.00 Iridisite* (Ir,Cu,Rh,Ni,Pt)S2 Unk Cubic
02.XX.00 Kitaibelite? Ag10PbBi30S51 Mono ? Mono
02.XX.00 Jeromite? As(S,Se)2 None
02.XX.00 Parajamesonite? Pb4FeSb6S14 Unk Ortho
02.XX.00 Volfsonite* Cu10CuFeFe2Sn3S16 P 42m-,P 4212 Tetra
02.XX.00 Prassoite Rh17S15(?) P m3m 4/m 3 2/m
02.XX.00 Sakharovaite? (Pb,Fe)(Bi,Sb)2S4 Mono
02.XX.00 Samaniite Cu2Fe5Ni2S8 P 41/mmm 4mm
02.XX.00 Tazieffite! Pb20Cd2(As,Bi)22S50Cl10 C 2/c 2/m
02.XX.00 Horomanite Fe6Ni3S8 P 4/mmm 4mm

Other Bravoite Information

Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Sinkankas66) OPTIC PROP.(AntBidBlaNic1)
Help on See Also: See Also: Links to other databases for Bravoite :
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
11 - Scandinavian mineral gallery

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Dana No: Strunz No: 02.XX.00





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