Otavite Mineral Data

General Otavite Information

Chemical Formula:

CdCO3

Composition:

Molecular Weight = 172.42 gm

Cadmium 65.20 % Cd 74.48 % CdO

Carbon 6.97 % C 25.52 % CO₂

Oxygen 27.84 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Cd(CO₃)

IMA Status:

Valid Species (Pre-IMA) 1906

Locality:

Tsumeb, near Otavi (Namibia). Link to MinDat.org Location Data.

Name Origin:

Named after its locality.

Name Pronunciation:

Otavite

Synonym:

ICSD 20181

PDF 42-1342

Otavite Image

Images:

Otavite

Comments: White rhombohedra of otavite.
Location: Tsumeb mine, Tsumeb, Otavi District, Oshikoto, Namibia. Scale: See Image.
© Rruff Database

Otavite Crystallography

Axial Ratios:

a:c = 1:3.29784

Cell Dimensions:

a = 4.912, c = 16.199, Z = 6; V = 338.48 Den(Calc)= 5.07

Crystal System:

Trigonal - Hexagonal Scalenohedral H-M Symbol (3 2/m) Space Group: R 3c

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

By Intensity(I/I_o): 2.95(1), 3.78(0.8), 2.46(0.35),

Physical Properties of Otavite

Cleavage:

{1011} Perfect, {1011} Perfect, {1011} Perfect

Color:

Yellow brown, White, Reddish, Reddish white.

Density:

5.03

Diaphaneity:

Transparent to Translucent

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Habit:

Encrustations - Forms crust-like aggregates on matrix.

Habit:

Euhedral Crystals - Occurs as well-formed crystals showing good external form.

Hardness:

3.5-4 - Copper Penny-Fluorite

Luminescence:

Fluorescent, Short UV=red, Long UV=red.

Luster:

Adamantine - Pearly

Streak:

white

Optical Properties of Otavite

Optical Data:

NCalc= 1.76 - from Gladstone-Dale relationship (KC = 0.1507) where Ncalc=Dcalc*KC+1
NCalc= 1.76 - from Gladstone-Dale relationship (KC = 0.1507) where Ncalc=Dmeas*KC+1

Calculated Properties of Otavite

Electron Density:

Bulk Density (Electron Density)=4.59 gm/cc
note: Specific Gravity of Otavite =5.07 gm/cc.

Fermion Index:

Fermion Index = 0.16
Boson Index = 0.84

Photoelectric:

PE_Otavite= 173.75 barns/electron
U=PE_Otavite x rElectron Density= 797.03 barns/cc.

Radioactivity:

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

Otavite Classification

Dana Class:

14.01.01.07 (14)Anhydrous Carbonates

(14.01)with Simple Formula A+ CO3

(14.01.01)Calcite Group (Trigonal: R-3c)

14.01.01.01 Calcite CaCO3 R 3c 3 2/m

14.01.01.02 Magnesite MgCO3 R 3c 3 2/m

14.01.01.03 Siderite FeCO3 R 3c 3 2/m

14.01.01.04 Rhodochrosite MnCO3 R 3c 3 2/m

14.01.01.05 Sphaerocobaltite CoCO3 R 3c 3 2/m

14.01.01.06 Smithsonite ZnCO3 R 3c 3 2/m

14.01.01.07 Otavite CdCO3 R 3c 3 2/m

14.01.01.08 Gaspeite (Ni,Mg,Fe)CO3 R 3c 3 2/m

Strunz Class:

05.AB.05 05 - CARBONATES (NITRATES)

05.A - Carbonates without additional anions, without H2O

05.AB -Alkali-earth (and other M2+) carbonates

05.AB.05 Calcite CaCO3 R 3c 3 2/m

05.AB.05 Gaspeite (Ni,Mg,Fe)CO3 R 3c 3 2/m

05.AB.05 Magnesite MgCO3 R 3c 3 2/m

05.AB.05 Rhodochrosite MnCO3 R 3c 3 2/m

05.AB.05 Otavite CdCO3 R 3c 3 2/m

05.AB.05 Sphaerocobaltite CoCO3 R 3c 3 2/m

05.AB.05 Siderite FeCO3 R 3c 3 2/m

05.AB.05 Smithsonite ZnCO3 R 3c 3 2/m

Other Otavite Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990)

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

Otavite

CdCO3
Dana No: 14.01.01.07 Strunz No: 05.AB.05
Locality:

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