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Hellyerite

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About HellyeriteHide

Formula:
NiCO3 · 5.5H2O
Colour:
pale blue
Lustre:
Vitreous
Hardness:
Specific Gravity:
1.97
Crystal System:
Monoclinic
Name:
In honour of Henry Hellyer (1791– September 2, 1832), first Surveyor-General of the Van Diemen’s Land Company and explorer of northwestern Tasmania.
Hellyerite is relatively unstable and, if not kept in an air-tight environment, the (originally) blue mineral decomposes in time to an X-ray amorphous, zaratite-like green phase, and other secondary nickel minerals (Anderson et al., 2002; Bottrill & Baker, 2008).


Classification of HellyeriteHide

Approved
5.CA.20

5 : CARBONATES (NITRATES)
C : Carbonates without additional anions, with H2O
A : With medium-sized cations
15.1.7.1

15 : HYDRATED NORMAL CARBONATES
1 : A(XO3)·xH2O
11.14.4

11 : Carbonates
14 : Carbonates of Co and Ni

Physical Properties of HellyeriteHide

Vitreous
Transparency:
Transparent
Colour:
pale blue
Hardness:
2½ on Mohs scale
Cleavage:
Perfect
One perfect and 2 good cleavages
Density:
1.97 g/cm3 (Measured)    1.98 g/cm3 (Calculated)

Optical Data of HellyeriteHide

Type:
Biaxial (-)
RI values:
nα = 1.455(2) nβ = 1.503(2) nγ = 1.549(2)
2V:
Measured: 85° , Calculated: 86°
Max Birefringence:
δ = 0.094
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
r > v distinct
Pleochroism:
Weak
Comments:
X very pale greenish blue, Y very pale greenish blue and Z pale greenish blue

Chemical Properties of HellyeriteHide

Formula:
NiCO3 · 5.5H2O
IMA Formula:
Ni(CO3) · 6H2O

Crystallography of HellyeriteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P2/m
Setting:
P2/m
Cell Parameters:
a = 10.769(2) Å, b = 7.295(2) Å, c = 9.343(2) Å
β = 94°
Ratio:
a:b:c = 1.476 : 1 : 1.281
Unit Cell V:
732.20 ų (Calculated from Unit Cell)
Z:
4
Twinning:
lamellar twinning occurs parallel to the perfect cleavage, individual twin lamellae ranging from 0.002 mm. to 0.03 mm. in width.
Comment:
synthetic

Type Occurrence of HellyeriteHide

General Appearance of Type Material:
extremely fine-grained coatings up to 1.0 mm. thick
Place of Conservation of Type Material:
Harvard University, Cambridge, Massachusetts, USA, 108400
Geological Setting of Type Material:
oxidation of nickel sulfides
Associated Minerals at Type Locality:

Other Language Names for HellyeriteHide

German:Hellyerit
Spanish:Hellyerita

Common AssociatesHide

Associated Minerals Based on Photo Data:
4 photos of Hellyerite associated with HeazlewooditeNi3S2
4 photos of Hellyerite associated with ZaratiteNi3(CO3)(OH)4 · 4H2O ?
2 photos of Hellyerite associated with ReevesiteNi6Fe3+2(OH)16(CO3) · 4H2O
1 photo of Hellyerite associated with Pentlandite(FexNiy)Σ9S8

Related Minerals - Nickel-Strunz GroupingHide

5.CA.05NesquehoniteMgCO3 · 3H2OMon. 2/m : P21/m
5.CA.10LansforditeMgCO3 · 5H2OMon. 2/m : P21/b
5.CA.15BarringtoniteMgCO3 · 2H2OTric.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

11.14.1SpherocobaltiteCoCO3Trig. 3m (3 2/m) : R3c
11.14.2KolweziteCuCo(CO3)(OH)2Tric.
11.14.3NullaginiteNi2(CO3)(OH)2Mon.
11.14.5OtwayiteNi2(CO3)(OH)2 · H2OOrth.
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 HellyeriteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Williams, K.L., I.M. Threadgold, and A.W. Hounslow (1959) Hellyerite, a new nickel carbonate from Heazlewood, Tasmania. Amer. Mineral., 44, 533–538.
Threadgold, I.M. (1963) The crystal structure of hellyerite and nacrite. Dissertation Abs., 24(1), 252–253.
Anderson, P., et al. (2002): Famous mineral localities: The Lord Brassey mine, Tasmania. Mineralogical Record. 33, 321-332.
Bottrill, R. S. & Baker, W. E. (2008): A Catalogue of the Minerals of Tasmania. Geological Survey Bulletin 73, Mineral Resources Tasmania, 254 pp.
Powder Diffraction File: 24-523.
Bette, S., Rincke, C., Dinnebier, R. E., & Voigt, W. (2016). Crystal Structure and Hydrate Water Content of Synthetic Hellyerite, NiCO3· 5.5 H2O. Zeitschrift für anorganische und allgemeine Chemie, 642(9‐10), 652-659.

Internet Links for HellyeriteHide

Localities for HellyeriteHide

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 (TL)
 
  • Tasmania
    • Waratah-Wynyard municipality
      • Heazlewood district
Anderson, P., Bottrill, R. & Davidson, P. (2002): Famous mineral localities: The Lord Brassey mine, Tasmania. Mineralogical Record 33, 321-332 ; American Mineralogist: 44: 533-538
Poland
 
  • Greater Poland Voivodeship
    • Poznań Co.
Karwowski, Ł., Pilski, A. S., Muszyński, A., Arnold, S., Notkin, G., & Gurdziel, A. (2011). New finds in the Morasko meteorite preserve, Poland. Meteorites, 1, 21-28.; Gurdziel, A., & Karwowski, Ł. (2016). Reevesyt i jarosyt–nowe wtórne fazy w meteorycie Morasko. Acta Societatis Metheoriticae Polonorum, 7, 27-35.
South Africa
 
  • Limpopo
    • Vhembe District
Cairncross, B. and Dixon, R., (1995) Minerals of South Africa. The Geological Society of South Africa: 212.
Cairncross, B. and Dixon, R., (1995) Minerals of South Africa. The Geological Society of South Africa.
 
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