Mineralogy Database

Kusachiite Mineral Data

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General Kusachiite Information

Help on Chemical  Formula: Chemical Formula: CuBi2O4
Help on Composition: Composition: Molecular Weight = 545.50 gm
   Copper   11.65 %  Cu   13.12 % Cu2O
   Bismuth  76.62 %  Bi   85.42 % Bi2O3
   Oxygen   11.73 %  O
           ______        ______ 
           100.00 %       98.53 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: CuBi2O4
Help on Environment: Environment: On calcite crystals in a calcite vein which occurs along the boundary between gehlenite-surrite skarn and crystalline limestone.
Help on IMA Status: IMA Status: Approved IMA 1995
Help on Locality: Locality: Fika, Bitchu-Cho, Okayama Prefecture, Japan. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: For Dr. Isao Kusachi (1942- ), of Okayama University in recognition of his work on the skarn minerals of the locality.
Help on Name Pronunciation: Name Pronunciation: Kusachiite + Pronunciation Say KUSACHIITE
Help on Synonym: Synonym: ICSD 68815
  PDF 48-1868

Kusachiite Image

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Comments: Black kusachiite with blue henmilite.
Location: Fuka, Bicchu-cho, Okayama Prefecture, Japan. Scale: Picture Size 0.5 mm.
© Thomas Witzke

Kusachiite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:0.68417
Help on Cell Dimensions: Cell Dimensions: a = 8.511, c = 5.823, Z = 4; V = 421.80 Den(Calc)= 8.59
Help on Crystal System: Crystal System: Tetragonal - Ditetragonal Dipyramidal H-M Symbol (4/m 2/m 2/m) Space Group: P 4/ncc
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.191(1), 1.947(0.18), 2.695(0.18),

Physical Properties of Kusachiite

Help on Cleavage: Cleavage: {110} Perfect
Help on Color: Color: Black.
Help on Density: Density: 8.5
Help on Diaphaneity: Diaphaneity: Opaque
Help on Habit: Habit: Crystalline - Fine - Occurs as well-formed fine sized crystals.
Help on Habit: Habit: Globular - Spherical, or nearly so, rounded forms (e.g. wavellite).
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Hardness: Hardness: 4-5 - Fluorite-Apatite
Help on Luster: Luster: Metallic
Help on Streak: Streak: black

Optical Properties of Kusachiite

Help on Optical Data: Optical Data: Uniaxial (?).
  NCalc= 2.39 - from Gladstone-Dale relationship (KC = 0.1614) where Ncalc=Dcalc*KC+1
NCalc= 2.37 - from Gladstone-Dale relationship (KC = 0.1614) where Ncalc=Dmeas*KC+1
Help on RL Anisotrophism: RL Anisotrophism: Weak to distinct.
Help on RL Bireflectance: RL Bireflectance: Weak.
Help on RL Color: RL Color: Gray, with deep red to dark brown internal reflections.
Help on RL Pleochroism: RL Pleochroism: Gray with a faint bluish tint, and brownish gray.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Kusachiite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 482 nm   19.00   21.50 
 545 nm   18.00   20.20 
 589 nm   17.60   19.70 
 650 nm   17.30   19.50 
Calculated Relative Intensity Colors of Kusachiite in Air
   0%   50% 100% 150% 200% 250% 300% 350% 400% 450% 500%

Calculated Properties of Kusachiite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=7.15 gm/cc
note: Specific Gravity of Kusachiite =8.59 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0000570789
Boson Index = 0.9999429211
Help on Photoelectric: Photoelectric: PEKusachiite =1,487.44 barns/electron
U=PEKusachiite x rElectron Density=10633.86 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Kusachiite is Not Radioactive

Kusachiite Classification

Help on  Dana Class: Dana Class: (07)Multiple Oxides
  (07.02)(A+ B++)2 X4 Spinel group
  (07.02.06)Dana Group Kusachiite CuBi2O4 P 4/ncc 4/m 2/m 2/m Iwakiite Mn(Fe,Mn)2O4 P 41/nnm 4/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 04.JA.20 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.J - Arsenites, Antimonites, Bismuthites, Sulfites,
  04.JA -Arsenites, antimonites, bismuthites; without additional anions, without H2O
04.JA.20 Kusachiite CuBi2O4 P 4/ncc 4/m 2/m 2/m
04.JA.20 Schafarzikite FeSb2O4 P 41/mbc 4/m 2/m 2/m
04.JA.20 Trippkeite CuAs2O4 P 41/mbc 4/m 2/m 2/m

Other Kusachiite Information

Help on References: References: NAME( MinRec) PHYS. PROP.(Am.Min.,Vol.81,1996) OPTIC PROP.(AntBidBlaNic3)
Help on See Also: See Also: Links to other databases for Kusachiite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - GeoScienceWorld
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - Mineralienatlas (Deutsch)
11 - Online Mineral Museum
12 - QUT Mineral Atlas
13 - Ruff.Info

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Dana No: Strunz No: 04.JA.20





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