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Otwayite

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Formula:
Ni2(CO3)(OH)2 · H2O
Colour:
Green
Hardness:
4
Specific Gravity:
3.41
Crystal System:
Orthorhombic
Name:
Named in 1977 by Ernest H. Nickel, Bruce W. Robinson, Charles E.S. Davis in honor of Mr. Charles Albert Otway of Gosnells (Perth), Western Australia, a prospector and miner who held the mineral lease and provided samples of the mineral.
A mineral closely related to paraotwayite.


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Classification of OtwayiteHide

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

Physical Properties of OtwayiteHide

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

Optical Data of OtwayiteHide

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 OtwayiteHide

Formula:
Ni2(CO3)(OH)2 · H2O
IMA Formula:
Ni2CO3(OH)2 · H2O
Common Impurities:
Mg

Crystallography of OtwayiteHide

Crystal System:
Orthorhombic
Cell Parameters:
a = 10.18 Å, b = 27.4 Å, c = 3.22 Å
Ratio:
a:b:c = 0.372 : 1 : 0.118
Unit Cell V:
898.16 ų (Calculated from Unit Cell)

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
(

Type Occurrence of OtwayiteHide

Synonyms of OtwayiteHide

Other Language Names for OtwayiteHide

German:Otwayit
Spanish:Otwayita

Common AssociatesHide

Associated Minerals Based on Photo Data:
Widgiemoolthalite1 photo of Otwayite associated with Widgiemoolthalite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

5.DA.AlexkhomyakoviteK6(Ca2Na)(CO3)5Cl·6H2OHex. 6/mmm (6/m 2/m 2/m) : P63/mcm
5.DA.05DypingiteMg5(CO3)4(OH)2 · 5H2OMon.
5.DA.05GiorgiositeMg5(CO3)4(OH)2 · 5-6H2O
5.DA.05HydromagnesiteMg5(CO3)4(OH)2 · 4H2OMon.
5.DA.05WidgiemoolthaliteNi5(CO3)4(OH)2 · 5H2OMon.
5.DA.05UM1986-10-CO:ClHMgMnZnMg5(Zn,Mn)3(CO3)2(OH,Cl)12 · H2O
5.DA.05UM1987-01-CO:HMgSMg4(CO3)2(OH)4 · 6H2O ?Mon.
5.DA.10ArtiniteMg2(CO3)(OH)2 · 3H2OMon.
5.DA.10IndigiriteMg2Al2(CO3)4(OH)2 · 15H2O
5.DA.10ChlorartiniteMg2(CO3)(OH)Cl · 2H2OTrig. 3m : R3c
5.DA.15ZaratiteNi3(CO3)(OH)4 · 4H2O ?Iso.
5.DA.20KambaldaiteNaNi4(CO3)3(OH)3 · 3H2OHex.
5.DA.25CallaghaniteCu2Mg2(CO3)(OH)6 · 2H2OMon.
5.DA.30Claraite(Cu,Zn)15(CO3)4(AsO4)2(SO4)(OH)14·7H2OTric.
5.DA.35HydroscarbroiteAl14(CO3)3(OH)36 · nH2OTric.
5.DA.35ScarbroiteAl5(CO3)(OH)13 · 5H2OHex.
5.DA.40CaresiteFe2+4Al2(OH)12[CO3] · 3H2OTrig.
5.DA.40QuintiniteMg4Al2(OH)12[CO3] · 3H2OHex. 6 2 2 : P63 2 2
5.DA.40CharmariteMn2+4Al2(OH)12[CO3] · 3H2O
5.DA.45Stichtite-2HMg6(Cr,Al)2(CO3)(OH)16 · 4H2OHex.
5.DA.45BrugnatelliteMg6Fe3+(CO3)(OH)13 · 4H2OHex.
5.DA.45ChlormagaluminiteMg4Al2(OH)12Cl2 · 3H2OHex.
5.DA.45Hydrotalcite-2HMg6Al2(CO3)(OH)16 · 4H2OHex.
5.DA.45Pyroaurite-2HMg6Fe3+2(OH)16(CO3) · 4H2OHex. 6/mmm (6/m 2/m 2/m) : P63/mmc
5.DA.45ZaccagnaiteZn4Al2(OH)12[CO3] · 3H2OHex.
5.DA.50ComblainiteNi4Co2(OH)12[CO3] · 3H2OTrig.
5.DA.50DesautelsiteMg6Mn3+2(OH)16[CO3] · 4H2OTrig. 3m (3 2/m)
5.DA.50HydrotalciteMg6Al2(OH)16[CO3] · 4H2OTrig. 3m (3 2/m) : R3m
5.DA.50PyroauriteMg6Fe3+2(OH)16[CO3] · 4H2OTrig. 3m (3 2/m) : R3m
5.DA.50ReevesiteNi6Fe3+2(OH)16(CO3) · 4H2OTrig.
5.DA.50StichtiteMg6Cr3+2(OH)16[CO3] · 4H2OTrig. 3m (3 2/m) : R3m
5.DA.50TakoviteNi6Al2(OH)16[CO3] · 4H2OTrig.
5.DA.50UM1998-10-CO:CoHNiCo6Fe2(CO3)(OH)16 · 4H2O ?
5.DA.55CoalingiteMg10Fe3+2(OH)24[CO3] · 2H2OTrig.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

11.14.1SpherocobaltiteCoCO3Trig. 3m (3 2/m) : R3c
11.14.2Kolwezite(Cu,Co)2(CO3)(OH)2Tric.
11.14.3NullaginiteNi2(CO3)(OH)2Mon.
11.14.4HellyeriteNiCO3 · 5.5H2OMon. 2/m : P2/m
11.14.6ZaratiteNi3(CO3)(OH)4 · 4H2O ?Iso.
11.14.7KambaldaiteNaNi4(CO3)3(OH)3 · 3H2OHex.
11.14.8Glaukosphaerite(Cu,Ni)2(CO3)(OH)2Mon. 2/m : P21/b
11.14.9GaspéiteNi(CO3)Hex.
11.14.10ReevesiteNi6Fe3+2(OH)16(CO3) · 4H2OTrig.
11.14.11ComblainiteNi4Co2(OH)12[CO3] · 3H2OTrig.
11.14.12SzymańskiiteHg16(Ni,Mg)6(CO3)12(OH)12(H3O)8•3H2OHex.

Other InformationHide

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 OtwayiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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 OtwayiteHide

Localities for OtwayiteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Australia
 
  • Tasmania
    • Waratah-Wynyard municipality
      • Heazlewood district
Henry, D. A. & Birch, W. D. (1992): Otwayite and theophrastite from the Lord Brassey Mine, Tasmania. Mineralogical Magazine 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
Naldrett, A.J. (2004): Magmatic Sulfide Deposits. Springer (Berlin, Heidelberg, New York)(2004):740
      • Widgiemooltha
Nickel E H, Robinson B W, Mumme W G (1993) Widgiemoolthalite: the new Ni analogue of hydromagnesite from Western Australia. American Mineralogist 78, 819-821; Clissold, M. E. (2007) Aspects of the Supergene Geochemistry of Copper, Nickel and Bismuth. PhD Thesis University of Sydney, Australia 162pp.
    • 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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