Help|Log In|Register|
Home PageMindat NewsThe Mindat ManualHistory of MindatCopyright StatusManagement TeamContact UsAdvertise on Mindat
Donate to MindatSponsor a PageSponsored PagesTop Available PagesMindat AdvertisersAdvertise on MindatThe Mindat Store
Minerals by PropertiesMinerals by ChemistryRandom MineralSearch by minIDLocalities Near MeSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportAdd Glossary Item
StatisticsMember ListBooks & MagazinesMineral Shows & EventsThe Mindat DirectoryHow to Link to MindatDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day Gallery


This page is currently not sponsored. Click here to sponsor this page.
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 (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

Year of Discovery:

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

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
Essential elements:
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
11.14.12SzymańskiiteHg16(Ni,Mg)6(CO3)12(OH)12 · 11H2O

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.
Mineral and/or Locality is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization.
Copyright © and the Hudson Institute of Mineralogy 1993-2015, except where stated. relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: October 7, 2015 09:06:07 Page generated: October 1, 2015 06:02:06