Otwayite Mineral Data

Otwayite Mineral Data +

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General Otwayite Information

Chemical Formula:

Ni2(CO3)(OH)2·(H2O)

Composition:

Molecular Weight = 229.42 gm

Nickel 51.16 % Ni 65.11 % NiO

Hydrogen 1.76 % H 15.71 % H₂O

Carbon 5.24 % C 19.18 % CO₂

Oxygen 41.84 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ni₂(CO₃)(OH)₂·(H₂O)

Environment:

Late-stage fracture filling.

IMA Status:

Approved IMA 1977

Locality:

Nullagine region of WA, Australia. Link to MinDat.org Location Data.

Name Origin:

Named after Charles Albert Otway (1922-), miner and prospector of Cosnells, WA, Australia.

Otwayite Image

Images:

Otwayite

Comments: Pale green botryoidal otwayite on serpentinite rock.
Location: Otway Prospect, Nullagin Plain, Western Australia, Australia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Otwayite Crystallography

Axial Ratios:

a:b:c =0.3715:1:0.1175

Cell Dimensions:

a = 10.18, b = 27.4, c = 3.22, Z = 8; V = 898.16 Den(Calc)= 3.39

Crystal System:

OrthorhombicSpace Group: Unk

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

By Intensity(I/I_o): 6.84(1), 5.67(0.8), 2.737(0.6),

Physical Properties of Otwayite

Color:

Green, Bright green.

Density:

3.41

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Fibrous - Crystals made up of fibers.

Hardness:

4 - Fluorite

Luster:

Silky

Streak:

light green

Optical Properties of Otwayite

Gladstone-Dale:

CI meas= 0.036 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.031 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2021,KPDmeas= 0.2009,KC= 0.2085

Optical Data:

Biaxial (?), a=1.65, g=1.72, bire=0.0700

Pleochroism (x):

pale green.

Pleochroism (y):

darker green.

Pleochroism (z):

darker green.

Calculated Properties of Otwayite

Electron Density:

r_electron=3.37 gm/cc
note: r_Otwayite=3.39 gm/cc.

Fermion Index

Fermion Index = 0.00656
Boson Index = 0.99344

Photoelectric:

PE_Otwayite= 20.10 barns/electron
U=PE_Otwayite x r_electron= 67.73 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Otwayite is Not Radioactive

Otwayite Classification

Dana Class:

16b.3.2.1 (16b)Carbonates - Hydroxyl or Halogen

(16b.3)where Am Bn (XO3)p Zq · x(H2O), (m+n):p = 2:1

(16b.3.2)Dana Group

16b.3.2.1 Otwayite Ni2(CO3)(OH)2·(H2O) Unk Ortho

Strunz Class:

V/E.05-10 V - Nitrates, Carbonates and Borates

V/E - Water-bearing carbonates with unfamiliar anions

V/E.05 - Otwayite - Szymanskite series

V/E.05-10 Otwayite Ni2(CO3)(OH)2·(H2O) Unk Ortho

V/E.05-20 Zaratite Ni3(CO3)(OH)4·4(H2O) Unk (in part amorphous) Cubic

V/E.05-30 Kambaldaite NaNi4(CO3)3(OH)3·3(H2O) P 6₃ 6

V/E.05-40 Szymanskiite Hg16(Ni,Mg)6(H3O)8(CO3)12·3(H2O) P 6₃ 6

Other Otwayite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)

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

Otwayite

Ni2(CO3)(OH)2·(H2O)
Dana No: 16b.3.2.1 Strunz No: V/E.05-10
Locality:

Notes: