Otavite Mineral Data

Otavite Mineral Data +

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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.

Synonym:

ICSD 20181

PDF 42-1342

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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 ScalenohedralH-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),

Crystal Structure:

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Graf D L , American Mineralogist , 46 (1961) p.1283-1316, Crystallographic tables for the rhombohedral carbonates

Physical Properties of Otavite

Cleavage:

[1011] Perfect, [1011] Perfect, [1011] Perfect

Color:

Yellow brown, White, Reddish, Reddish white.

Density:

5.03

Diaphaniety:

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.

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:

r_electron=4.59 gm/cc
note: r_Otavite=5.07 gm/cc.

Fermion Index

Fermion Index = 0.16408
Boson Index = 0.83592

Photoelectric:

PE_Otavite= 173.75 barns/electron
U=PE_Otavite x r_electron= 797.03 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Otavite is Not Radioactive

Otavite Classification

Dana Class:

14.1.1.7 (14)Anhydrous Carbonates

(14.1)with Simple Formula A+ CO3

(14.1.1)Calcite Group (Trigonal: R3¯c)

14.1.1.1 Calcite CaCO3 R 3c 3 2/m

14.1.1.2 Magnesite MgCO3 R 3c 3 2/m

14.1.1.3 Siderite FeCO3 R 3c 3 2/m

14.1.1.4 Rhodochrosite MnCO3 R 3c 3 2/m

14.1.1.5 Sphaerocobaltite CoCO3 R 3c 3 2/m

14.1.1.6 Smithsonite ZnCO3 R 3c 3 2/m

14.1.1.7 Otavite CdCO3 R 3c 3 2/m

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

Strunz Class:

V/B.02-90 V - Nitrates, Carbonates and Borates

V/B - Waterfree carbonates [CO3]2- without unfamiliar anions

V/B.02 - Calcite group

V/B.02-10 Vaterite CaCO3 P 6₃/mmc 6/m 2/m 2/m

V/B.02-20 Calcite CaCO3 R 3c 3 2/m

V/B.02-30 Magnesite MgCO3 R 3c 3 2/m

V/B.02-40 Siderite FeCO3 R 3c 3 2/m

V/B.02-50 Rhodochrosite MnCO3 R 3c 3 2/m

V/B.02-60 Smithsonite ZnCO3 R 3c 3 2/m

V/B.02-70 Sphaerocobaltite CoCO3 R 3c 3 2/m

V/B.02-80 Gaspeite (Ni,Mg,Fe)CO3 R 3c 3 2/m

V/B.02-90 Otavite CdCO3 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: 14.1.1.7 Strunz No: V/B.02-90
Locality:

Notes: