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NiCO3 · 6H2O
In honour of Henry Hellyer (1791–1832), 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 Hellyerite


C : Carbonates without additional anions, with H2O
A : With medium-sized cations

1 : A(XO3)·xH2O

11 : Carbonates
14 : Carbonates of Co and Ni URL:
Please feel free to link to this page.

Type Occurrence of Hellyerite

Physical Properties of Hellyerite

Hardness (Mohs):

Crystallography of Hellyerite

Crystal System:
Cell Parameters:
a = 10.77Å, b = 7.29Å, c = 18.68Å
β = 94°
a:b:c = 1.477 : 1 : 2.562
Unit Cell Volume:
V nan ų (Calculated from Unit Cell)

Optical Data of Hellyerite

Biaxial (-)
RI values:
nα = 1.455 nβ = 1.503 nγ = 1.549
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:
r > v distinct

Chemical Properties of Hellyerite

NiCO3 · 6H2O
All elements listed in formula:

Relationship of Hellyerite to other Species

5.CA.05NesquehoniteMgCO3 · 3H2O
5.CA.10LansforditeMgCO3 · 5H2O
5.CA.15BarringtoniteMgCO3 · 2H2O
11.14.5OtwayiteNi2(CO3)(OH)2 · H2O
11.14.6ZaratiteNi3(CO3)(OH)4 · 4H2O ?
11.14.7KambaldaiteNaNi4(CO3)3(OH)3 · 3H2O
11.14.10ReevesiteNi6Fe23+(OH)16(CO3) · 4H2O
11.14.11ComblainiteNi4Co2(OH)12[CO3] · 3H2O

Other Names for Hellyerite

Name in Other Languages:

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 Hellyerite

Reference List:
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.

Internet Links for Hellyerite

Localities for Hellyerite

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 (TL)
  • Tasmania
    • 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
South Africa
  • Limpopo Province
    • 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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