Paraotwayite Mineral Data

Paraotwayite Mineral Data +

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General Paraotwayite Information

Chemical Formula:

Ni(OH)2-x(SO4,CO3)0.5x x=.5

Composition:

Molecular Weight = 103.71 gm

Nickel 56.59 % Ni 72.02 % NiO

Hydrogen 1.46 % H 13.03 % H₂O

Carbon 1.45 % C 5.30 % CO₂

Sulfur 3.86 % S 9.65 % SO₃

Oxygen 36.64 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ni(OH)_1.5(SO₄)_0.125(CO₃)_0.125

IMA Status:

Approved IMA 1987

Locality:

Otway nickel deposit, Nullagine, Pilbara region, WA. Australia. Link to MinDat.org Location Data.

Name Origin:

Named for its close physical and chemical resemblance to otwayite.

Paraotwayite Image

Images:

Paraotwayite

Comments: Pale green, fibrous, silky, free standing paraotwayite crystals to about 0.25mm.
Location: Vaca Murta meteorite, Taltal, Atacama, Chile. Scale: Crystal size .25 mm.
© Tom Loomis / Dakota Matrix

Paraotwayite Crystallography

Axial Ratios:

a:b:c =2.6655:1:4.6047

Cell Dimensions:

a = 7.89, b = 2.96, c = 13.63, Z = 6; beta = 91.1° V = 318.26 Den(Calc)= 3.25

Crystal System:

Monoclinic - DomaticH-M Symbol (m) Space Group: Pm

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

By Intensity(I/I_o): 6.81(1), 2.239(0.8), 5.083(0.8),

Physical Properties of Paraotwayite

Cleavage:

None

Color:

Emerald green.

Density:

3.3

Diaphaniety:

Translucent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Fibrous - Crystals made up of fibers.

Hardness:

4 - Fluorite

Luster:

Silky

Streak:

white

Optical Properties of Paraotwayite

Gladstone-Dale:

CI meas= -0.034 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.05 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2092,KPDmeas= 0.2061,KC= 0.1993

Optical Data:

Biaxial (?), a=1.655, g=1.705, bire=0.0500

Calculated Properties of Paraotwayite

Electron Density:

r_electron=3.26 gm/cc
note: r_Paraotwayite=3.30 gm/cc.

Fermion Index

Fermion Index = 0.00702
Boson Index = 0.99298

Photoelectric:

PE_Paraotwayite= 22.52 barns/electron
U=PE_Paraotwayite x r_electron= 73.44 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Paraotwayite is Not Radioactive

Paraotwayite Classification

Dana Class:

6.2.12.1 (6)Hydroxides and Oxides Containing Hydroxyl

(6.2)where X++ (OH)2

(6.2.12)Dana Group

6.2.12.1 Paraotwayite Ni(OH)2-x(SO4,CO3)0.5xx=.5 Pm m

Strunz Class:

IV/F.03-50 IV - Oxides

IV/F - Hydroxides and oxidic hydrates, water-bearing oxides with layered structure

IV/F.03 - Brucite series

IV/F.03-10 Brucite Mg(OH)2 P 3m1 3 2/m

IV/F.03-20 Amakinite (Fe,Mg)(OH)2 P 3m1 3 2/m

IV/F.03-30 Pyrochroite Mn(OH)2 P 3m1 3 2/m

IV/F.03-40 Theophrastite Ni(OH)2 P 3m1 3 2/m

IV/F.03-50 Paraotwayite Ni(OH)2-x(SO4,CO3)0.5xx=.5 Pm m

IV/F.03-60 Sweetite Zn(OH)2 P 4₁2₁2,P 4₃2₁2 4 2 2

IV/F.03-70 Ashoverite Zn(OH)2 I 4₁/amd 4/m 2/m 2/m

IV/F.03-80 Wulfingite Zn(OH)2 P 2₁2₁2₁ 2 2 2

IV/F.03-90 Spertiniite Cu(OH)2 C mc2₁ mm2

IV/F.03-100 Portlandite Ca(OH)2 P 3m1 3 2/m

Other Paraotwayite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Am.Min.,Vol.73,p1496,1988)

See Also:

Links to other databases for Paraotwayite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - Crocoite.com Mineral Locations 4 - EUROmin Project 5 -Google Images 6 -Google Scholar 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 -École des Mines de Paris

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

Paraotwayite

Ni(OH)2-x(SO4,CO3)0.5x x=.5
Dana No: 6.2.12.1 Strunz No: IV/F.03-50
Locality:

Notes: