Kusachiite Mineral Data

Kusachiite Mineral Data +

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General Kusachiite Information

Chemical Formula:

CuBi2O4

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

Empirical Formula:

CuBi₂O₄

Environment:

On calcite crystals in a calcite vein which occurs along the boundary between gehlenite-surrite skarn and crystalline limestone.

IMA Status:

Approved IMA 1995

Locality:

Fika, Bitchu-Cho, Okayama Prefecture, Japan. Link to MinDat.org Location Data.

Name Origin:

For Dr. Isao Kusachi (1942- ), of Okayama University in recognition of his work on the skarn minerals of the locality.

Synonym:

ICSD 68815

IMA1992-024

PDF 48-1868

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Kusachiite Crystallography

Axial Ratios:

a:c = 1:0.68417

Cell Dimensions:

a = 8.511, c = 5.823, Z = 4; V = 421.80 Den(Calc)= 8.59

Crystal System:

Tetragonal - Ditetragonal DipyramidalH-M Symbol (4/m 2/m 2/m) Space Group: P 4/ncc

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

By Intensity(I/I_o): 3.191(1), 1.947(0.18), 2.695(0.18),

Physical Properties of Kusachiite

Cleavage:

[110] Perfect

Color:

Black.

Density:

8.5

Diaphaniety:

Opaque

Habit:

Crystalline - Fine - Occurs as well-formed fine sized crystals.

Habit:

Globular - Spherical, or nearly so, rounded forms (e.g. wavellite).

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Hardness:

4-5 - Fluorite-Apatite

Luster:

Metallic

Streak:

black

Optical Properties of Kusachiite

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

RL Anisotrophism:

Weak to distinct.

RL Bireflectance:

Weak.

RL Color:

Gray, with deep red to dark brown internal reflections.

RL Pleochroism:

Gray with a faint bluish tint, and brownish gray.

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**
Relative Intensity	0%	50%	100%	150%	200%	250%	300%	350%	400%	450%	500%
R₁
R₂

Calculated Properties of Kusachiite

Electron Density:

r_electron=7.15 gm/cc
note: r_Kusachiite=8.59 gm/cc.

Fermion Index

Fermion Index = 0.00005
Boson Index = 0.99995

Photoelectric:

PE_Kusachiite=1,487.44 barns/electron
U=PE_Kusachiite x r_electron=10633.86 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Kusachiite is Not Radioactive

Kusachiite Classification

Dana Class:

7.2.6.1 (7)Multiple Oxides

(7.2)(A+ B++)2 X4 Spinel group

(7.2.6)Dana Group

7.2.6.1 Kusachiite CuBi2O4 P 4/ncc 4/m 2/m 2/m

7.2.6.2 Iwakiite Mn(Fe,Mn)2O4 P 4₁/nnm 4/m 2/m 2/m

Strunz Class:

IV/B.06-15 IV - Oxides

IV/B - Oxides with metal : oxygen = 3:4 (spinel type M3O4 and related)

IV/B.06 - Trippkeite - Minium series

IV/B.06-10 Trippkeite CuAs2O4 P 4₁/mbc 4/m 2/m 2/m

IV/B.06-15 Kusachiite CuBi2O4 P 4/ncc 4/m 2/m 2/m

IV/B.06-20 Schafarzikite FeSb2O4 P 4₁/mbc 4/m 2/m 2/m

IV/B.06-30 Versiliaite Fe4Fe8Sb12O23S2 Pbam ? 2/m 2/m 2/m

IV/B.06-40 Apuanite FeFe4Sb4O12S P 4₁/mbc 4/m 2/m 2/m

IV/B.06-50 Minium Pb2PbO4 P 4₁/mbc 4/m 2/m 2/m

Other Kusachiite Information

References:

NAME( MinRec) PHYS. PROP.(Am.Min.,Vol.81,1996) OPTIC PROP.(AntBidBlaNic3)

See Also:

Links to other databases for Kusachiite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas

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Kusachiite

CuBi2O4
Dana No: 7.2.6.1 Strunz No: IV/B.06-15
Locality:

Notes: