Comblainite Mineral Data

Comblainite Mineral Data

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General Comblainite Information

Chemical Formula:

Ni++6Co+++2(CO3)(OH)16·4(H2O)

Composition:

Molecular Weight = 874.19 gm

Cobalt 13.48 % Co 18.97 % Co₂O₃

Nickel 40.28 % Ni 51.26 % NiO

Hydrogen 2.77 % H 24.73 % H₂O

Carbon 1.37 % C 5.03 % CO₂

Oxygen 42.09 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ni₆Co₂(CO₃)(OH)₁₆·4(H₂O)

Environment:

Secondary mineral found on altered uraninite in the uranium deposits at Shinkolobwe.

IMA Status:

Approved IMA 1980

Locality:

Shinkolobwe mine (Kasolo mine), Shaba (Katanga), Congo (Zaire). Link to MinDat.org Location Data.

Name Origin:

Named for Gordon Comblan (1929-) of the Musee Royal de l'Afrique Central, Tervuren, Belgium who discovered the mineral.

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Comblainite Crystallography

Axial Ratios:

a:c = 1:7.49671

Cell Dimensions:

a = 6.08, c = 45.58, Z = 3; V = 1,459.19 Den(Calc)= 2.98

Crystal System:

Trigonal - Hexagonal ScalenohedralH-M Symbol (3 2/m) Space Group: R 3m

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

By Intensity(I/I_o): 7.64(1), 2.567(0.7), 3.808(0.5),

Physical Properties of Comblainite

Color:

Blue, Turquoise.

Density:

3.05

Diaphaniety:

Transparent

Habit:

Encrustations - Forms crust-like aggregates on matrix.

Hardness:

2 - Gypsum

Luster:

Pearly

Optical Properties of Comblainite

Dichroism (e):

none.

Dichroism (w):

none.

Gladstone-Dale:

CI meas= 0.089 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.068 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2305,KPDmeas= 0.2252,KC= 0.2473

Optical Data:

Uniaxial (-), e=1.684, w=1.69, bire=0.0060.

Calculated Properties of Comblainite

Electron Density:

r_electron=2.97 gm/cc
note: r_Comblainite=2.98 gm/cc.

Fermion Index

Fermion Index = 0.0049
Boson Index = 0.9951

Photoelectric:

PE_Comblainite= 20.21 barns/electron
U=PE_Comblainite x r_electron= 60.07 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Comblainite is Not Radioactive

Comblainite Classification

Dana Class:

16b.6.3.3 (16b)Carbonates - Hydroxyl or Halogen

(16b.6)Dana Type

(16b.6.3)Sjorgrenite-Hydrotalcite Group (Hydrotalcite Subgroup:Rhombohedral)

16b.6.3.1 Reevesite Ni6Fe2(CO3)(OH)16·4(H2O) R 3m 3 2/m

16b.6.3.2 Takovite Ni6Al2(OH)16(CO3,OH)·4(H2O) R 3m 3 2/m

16b.6.3.3 Comblainite Ni6Co2(CO3)(OH)16·4(H2O) R 3m 3 2/m

Strunz Class:

V/E.03-70 V - Nitrates, Carbonates and Borates

V/E - Water-bearing carbonates with unfamiliar anions

V/E.03 - Hydrotalcite group

V/E.03-10 Hydrotalcite Mg6Al2(CO3)(OH)16·4(H2O) R 3m 3 2/m

V/E.03-20 Stichtite Mg6Cr2(CO3)(OH)16·4(H2O) R 3m 3 2/m

V/E.03-30 Pyroaurite Mg6Fe2(CO3)(OH)16·4(H2O) R 3m 3 2/m

V/E.03-40 Desautelsite Mg6Mn2(CO3)(OH)16·4(H2O) R 3m or R 3m Trig

V/E.03-50 Takovite Ni6Al2(OH)16(CO3,OH)·4(H2O) R 3m 3 2/m

V/E.03-60 Reevesite Ni6Fe2(CO3)(OH)16·4(H2O) R 3m 3 2/m

V/E.03-70 Comblainite Ni6Co2(CO3)(OH)16·4(H2O) R 3m 3 2/m

V/E.03-80 Sergeevite Ca2Mg11(CO3)9(HCO3)4(OH)4·6(H2O) R 32 3 2

Other Comblainite Information

References:

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

See Also:

Links to other databases for Comblainite :
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 12 -École des Mines de Paris

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

Comblainite

Ni++6Co+++2(CO3)(OH)16·4(H2O)
Dana No: 16b.6.3.3 Strunz No: V/E.03-70
Locality:

Notes: