Kolwezite Mineral Data

General Kolwezite Information

Chemical Formula:

(Cu,Co)2(CO3)(OH)2

Composition:

Molecular Weight = 218.07 gm

Cobalt 17.84 % Co 22.68 % CoO

Copper 39.05 % Cu 48.88 % CuO

Hydrogen 0.92 % H 8.26 % H₂O

Carbon 5.51 % C 20.18 % CO₂

Oxygen 36.68 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Cu_1.34Co_0.66(CO₃)(OH)₂

Environment:

Oxidized zone of a Cu-Co deposit.

IMA Status:

Approved IMA 1980

Locality:

Kolwezi-Kamoto-Musonoi, southern Shava, Zaire. Link to MinDat.org Location Data.

Name Origin:

Named for the mine locality.

Name Pronunciation:

Kolwezite + Pronunciation

Kolwezite Image

Images:

Kolwezite

Comments: Green kolwezite cotton balls on pink cobaltian calcite.
Location: Musononi mine, Kolwezi, Shaba, Democratic Republic of the Congo. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Kolwezite Crystallography

Axial Ratios:

a:b:c =0.7818:1:0.2624

Cell Dimensions:

a = 9.5, b = 12.15, c = 3.189, Z = 4; alpha = 93.32°, beta = 90.74°, gamma = 91.47° V = 367.32 Den(Calc)= 3.94

Crystal System:

Triclinic Space Group: P1 or P1

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

By Intensity(I/I_o): 3.7(1), 5.08(0.8), 6.04(0.8),

Physical Properties of Kolwezite

Color:

Beige brown, Green, Black.

Density:

3.97

Diaphaneity:

Translucent to Subopaque

Habit:

Encrustations - Forms crust-like aggregates on matrix.

Habit:

Nodular - Tuberose forms having irregular protuberances over the surface.

Hardness:

4 - Fluorite

Luster:

Vitreous (Glassy)

Streak:

beige

Optical Properties of Kolwezite

Gladstone-Dale:

CI meas= -0.029 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.037 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2015,KPDmeas= 0.2,KC= 0.1944
Ncalc = 1.77

Optical Data:

Biaxial (?), a=1.688, g=1.9, bire=0.2120

Calculated Properties of Kolwezite

Electron Density:

Bulk Density (Electron Density)=3.81 gm/cc
note: Specific Gravity of Kolwezite =3.97 gm/cc.

Fermion Index:

Fermion Index = 0.0007833302
Boson Index = 0.9992166698

Photoelectric:

PE_Kolwezite= 23.30 barns/electron
U=PE_Kolwezite x rElectron Density= 88.81 barns/cc.

Radioactivity:

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

Kolwezite Classification

Dana Class:

16a.03.01.03 (16a)Carbonates - Hydroxyl or Halogen

(16a.03)where (A B)2 (XO3) Zq

(16a.03.01)Rosasite Group

16a.03.01.01 Rosasite (Cu,Zn)2(CO3)(OH)2 P 2₁/a 2/m

16a.03.01.02 Glaukosphaerite (Cu,Ni)2(CO3)(OH)2 P 2₁/a 2/m

16a.03.01.03 Kolwezite (Cu,Co)2(CO3)(OH)2 P1 or P1 Tri

16a.03.01.04 Zincrosasite (Zn,Cu)2(CO3)(OH)2 P 2₁/a 2/m

16a.03.01.05 Mcguinnessite (Mg,Cu)2(CO3)(OH)2 P 2/a or P 2₁/a 2/m

Strunz Class:

05.BA.10 05 - CARBONATES (NITRATES)

05.B - Carbonates with additional anions, without H2O

05.BA -With Cu, Co, Ni, Zn, Mg, Mn

05.BA.10 Nullaginite Ni2(CO3)(OH)2 P 2₁/m,P 2₁ Mono

05.BA.10 Georgeite Cu5(CO3)3(OH)4•6(H2O) None

05.BA.10 Malachite Cu2(CO3)(OH)2 P 2₁/a 2/m

05.BA.10 Glaukosphaerite (Cu,Ni)2(CO3)(OH)2 P 2₁/a 2/m

05.BA.10 Mcguinnessite (Mg,Cu)2(CO3)(OH)2 P 2/a or P 2₁/a 2/m

05.BA.10 Kolwezite (Cu,Co)2(CO3)(OH)2 P1 or P1 Tri

05.BA.10 Pokrovskite Mg2(CO3)(OH)2•0.5(H2O) P 2₁/a 2/m

05.BA.10 Rosasite (Cu,Zn)2(CO3)(OH)2 P 2₁/a 2/m

05.BA.10 Zincrosasite (Zn,Cu)2(CO3)(OH)2 P 2₁/a 2/m

05.BA.10 Chukanovite! Fe2(CO3)(OH)2 P 2₁/a 2/m

Other Kolwezite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Kolwezite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info

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

Kolwezite

(Cu,Co)2(CO3)(OH)2
Dana No: 16a.03.01.03 Strunz No: 05.BA.10
Locality:

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