Kolwezite Mineral Data

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.

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:

TriclinicSpace 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

Diaphaniety:

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

Optical Data:

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

Calculated Properties of Kolwezite

Electron Density:

r_electron=3.81 gm/cc
note: r_Kolwezite=3.97 gm/cc.

Fermion Index

Fermion Index = 0.00078
Boson Index = 0.99922

Photoelectric:

PE_Kolwezite= 23.30 barns/electron
U=PE_Kolwezite x r_electron= 88.81 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Kolwezite is Not Radioactive

Kolwezite Classification

Dana Class:

16a.3.1.3 (16a)Carbonates - Hydroxyl or Halogen

(16a.3)where (A B)2 (XO3) Zq

(16a.3.1)Rosasite Group

16a.3.1.1 Rosasite (Cu,Zn)2(CO3)(OH)2 P 2₁/a 2/m

16a.3.1.2 Glaukosphaerite (Cu,Ni)2(CO3)(OH)2 P 2₁/a 2/m

16a.3.1.3 Kolwezite (Cu,Co)2(CO3)(OH)2 P1 or P1 Tri

16a.3.1.4 Zincrosasite (Zn,Cu)2(CO3)(OH)2 P 2₁/a 2/m

16a.3.1.5 Mcguinnessite (Mg,Cu)2(CO3)(OH)2 P 2/a or P 2₁/a 2/m

Strunz Class:

V/C.01-50 V - Nitrates, Carbonates and Borates

V/C - Waterfree carbonates with unfamiliar anions

V/C.01 - Azurite - Rosasite group and related compounds

V/C.01-10 Azurite Cu3(CO3)2(OH)2 P 2₁/a 2/m

V/C.01-20 Malachite Cu2(CO3)(OH)2 P 2₁/a 2/m

V/C.01-25 Georgeite Cu5(CO3)3(OH)4·6(H2O) None

V/C.01-30 Pokrovskite Mg2(CO3)(OH)2·0.5(H2O) P 2₁/a 2/m

V/C.01-40 Mcguinnessite (Mg,Cu)2(CO3)(OH)2 P 2/a or P 2₁/a 2/m

V/C.01-50 Kolwezite (Cu,Co)2(CO3)(OH)2 P1 or P1 Tri

V/C.01-60 Glaukosphaerite (Cu,Ni)2(CO3)(OH)2 P 2₁/a 2/m

V/C.01-70 Nullaginite Ni2(CO3)(OH)2 P 2₁/m,P 2₁ Mono

V/C.01-80 Rosasite (Cu,Zn)2(CO3)(OH)2 P 2₁/a 2/m

V/C.01-90 Zincrosasite (Zn,Cu)2(CO3)(OH)2 P 2₁/a 2/m

V/C.01-100 Hydrozincite Zn5(CO3)2(OH)6 C 2/m 2/m

V/C.01-105 Brianyoungite Zn3(CO3,SO4)(OH)4 C 2/m 2/m

V/C.01-110 Aurichalcite (Zn,Cu)5(CO3)2(OH)6 P 2₁/m 2/m

V/C.01-120 Loseyite (Mn,Zn)7(CO3)2(OH)10 A2/a 2/m

V/C.01-130 Sclarite (Zn,Mg,Mn)4Zn3(CO3)2(OH)10 A2/a 2/m

Other Kolwezite Information

References:

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

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Kolwezite

(Cu,Co)2(CO3)(OH)2
Dana No: 16a.3.1.3 Strunz No: V/C.01-50
Locality:

Notes: