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Otwayite

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Formula:
Ni2(CO3)(OH)2 · H2O
System:
Orthorhombic
Colour:
Green
Hardness:
4
A mineral closely related to paraotwayite.

Classification of Otwayite

Approved
5.DA.15

5 : CARBONATES (NITRATES)
D : Carbonates with additional anions, with H2O
A : With medium-sized cations
16b.3.2.1

16b : HYDRATED CARBONATES CONTAINING HYDROXYL OR HALOGEN
3 : AmBn(XO3)pZqxH2O & with (m+n):p = 2:1
11.14.5

11 : Carbonates
14 : Carbonates of Co and Ni
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First Recorded Occurrence of Otwayite

Year of Discovery:
1977

Physical Properties of Otwayite

Colour:
Green
Hardness (Mohs):
4
Density:
3.41 g/cm3 (Measured)    3.346 g/cm3 (Calculated)

Crystallography of Otwayite

Crystal System:
Orthorhombic
Cell Parameters:
a = 10.18Å, b = 27.4Å, c = 3.22Å
Ratio:
a:b:c = 0.372 : 1 : 0.118
Unit Cell Volume:
V 898.16 ų (Calculated from Unit Cell)
X-Ray Powder Diffraction Data:
d-spacingIntensity
(

Optical Data of Otwayite

Type:
Biaxial
RI values:
nα = 1.650 nγ = 1.720
Max Birefringence:
δ = 0.070
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
very strong

Chemical Properties of Otwayite

Formula:
Ni2(CO3)(OH)2 · H2O
Essential elements:
All elements listed in formula:
Common Impurities:
Mg

Relationship of Otwayite to other Species

5.DA.05DypingiteMg5(CO3)4(OH)2 · 5H2O
5.DA.05GiorgiositeMg5(CO3)4(OH)2 · 5-6H2O
5.DA.05HydromagnesiteMg5(CO3)4(OH)2 · 4H2O
5.DA.05WidgiemoolthaliteNi5(CO3)4(OH)2 · 5H2O
5.DA.05UM1986-10-CO:ClHMgMnZnMg5(Zn,Mn)3(CO3)2(OH,Cl)12 · H2O
5.DA.05UM1987-01-CO:HMgSMg4(CO3)2(OH)2 · 6H2O ?
5.DA.10ArtiniteMg2(CO3)(OH)2 · 3H2O
5.DA.10IndigiriteMg2Al2(CO3)4(OH)2 · 15H2O
5.DA.10ChlorartiniteMg2(CO3)(OH)Cl · 2H2O
5.DA.15ZaratiteNi3(CO3)(OH)4 · 4H2O
5.DA.20KambaldaiteNaNi4(CO3)3(OH)3 · 3H2O
5.DA.25CallaghaniteCu2Mg2(CO3)(OH)6 · 2H2O
5.DA.30Claraite(Cu,Zn)3(CO3)(OH)4 · 4H2O
5.DA.35HydroscarbroiteAl14(CO3)3(OH)36 · nH2O
5.DA.35ScarbroiteAl5(CO3)(OH)13 · 5H2O
5.DA.40CaresiteFe42+Al2(OH)12[CO3] · 3H2O
5.DA.40QuintiniteMg4Al2(OH)12[CO3] · 3H2O
5.DA.40CharmariteMn42+Al2(OH)12[CO3] · 3H2O
5.DA.45Stichtite-2HMg6(Cr,Al)2(CO3)(OH)16 · 4H2O
5.DA.45BrugnatelliteMg6Fe3+(CO3)(OH)13 · 4H2O
5.DA.45ChlormagaluminiteMg4Al2(OH)12Cl2 · 3H2O
5.DA.45Hydrotalcite-2HMg6Al2(CO3)(OH)16 · 4H2O
5.DA.45Pyroaurite-2HMg6Fe23+(CO3)(OH)16 · 4H2O
5.DA.45ZaccagnaiteZn4Al2(OH)12[CO3] · 3H2O
5.DA.50ComblainiteNi4Co2(OH)12[CO3] · 3H2O
5.DA.50DesautelsiteMg6Mn23+(OH)16[CO3] · 4H2O
5.DA.50HydrotalciteMg6Al2(OH)16[CO3] · 4H2O
5.DA.50PyroauriteMg6Fe23+(OH)16[CO3] · 4H2O
5.DA.50ReevesiteNi6Fe23+(OH)16(CO3) · 4H2O
5.DA.50StichtiteMg6Cr2(OH)16[CO3] · 4H2O
5.DA.50TakoviteNi6Al2(OH)16[CO3] · 4H2O
5.DA.50UM1998-10-CO:CoHNiCo6Fe2(CO3)(OH)16 · 4H2O ?
5.DA.55CoalingiteMg10Fe23+(OH)24[CO3] · 2H2O
11.14.1SpherocobaltiteCoCO3
11.14.2Kolwezite(Cu,Co)2(CO3)(OH)2
11.14.3NullaginiteNi2(CO3)(OH)2
11.14.4HellyeriteNiCO3 · 6H2O
11.14.6ZaratiteNi3(CO3)(OH)4 · 4H2O
11.14.7KambaldaiteNaNi4(CO3)3(OH)3 · 3H2O
11.14.8Glaukosphaerite(Cu,Ni)2(CO3)(OH)2
11.14.9Gaspéite(Ni,Mg,Fe)CO3
11.14.10ReevesiteNi6Fe23+(OH)16(CO3) · 4H2O
11.14.11ComblainiteNi4Co2(OH)12[CO3] · 3H2O
11.14.12SzymańskiiteHg16(Ni,Mg)6(CO3)12(OH)12 · 11H2O

Other Names for Otwayite

Name in Other Languages:
German:Otwayit
Spanish:Otwayita

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Otwayite

Reference List:
Nickel, E. H., Robinson, B. W., Davis, C. E. S. & MacDonald, R. D. (1977): Otwayite, a new nickel mineral from Western Australia. American Mineralogist: 62: 999-1002.

Internet Links for Otwayite

Localities for Otwayite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Australia
 
  • Tasmania
    • Heazlewood district
Henry, D. A. & Birch, W. D. (1992): Otwayite and theophrastite from the Lord Brassey Mine, Tasmania. Mineral. Mag. 56, 252-255.; Anderson, P., Bottrill, R. & Davidson, P. (2002): Famous mineral localities: The Lord Brassey mine, Tasmania. Mineralogical Record 33, 321-332
  • Western Australia
    • Coolgardie Shire
      • Widgiemooltha
No reference listed
    • East Pilbara Shire
      • Nullagine
Nickel, E. H.; Hallbert, J. A.; Halligan, R. (1979): Unusual nickel mineralization at Nullagine, Western Australia. Journal of the Geological Society of Australia 26, 61-71. ; Nickel, E. H., Robinson, B. W., Davis, C. E. S. & MacDonald, R. D. (1977): Otwayite, a new nickel mineral from Western Australia. American Mineralogist 62, 999-1002.
South Africa
 
  • Limpopo Province
    • Vhembe District
Minerals of South Africa
Cairncross, B. and Dixon, R., (1995) Minerals of South Africa. The Geological Society of South Africa.
Mineral and/or Locality  
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