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Hellyerite

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Formula:
NiCO3 · 5.5H2O
System:
Monoclinic
Colour:
pale blue
Hardness:
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 Hellyerite

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
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Type Occurrence of Hellyerite

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:

Physical Properties of Hellyerite

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

Crystallography of Hellyerite

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P2/m
Space Group 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 Volume:
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

Optical Data of Hellyerite

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 Hellyerite

Formula:
NiCO3 · 5.5H2O
All elements listed in formula:

Relationship of Hellyerite to other Species

5.CA.05NesquehoniteMgCO3 · 3H2O
5.CA.10LansforditeMgCO3 · 5H2O
5.CA.15BarringtoniteMgCO3 · 2H2O
11.14.1SpherocobaltiteCoCO3
11.14.2Kolwezite(Cu,Co)2(CO3)(OH)2
11.14.3NullaginiteNi2(CO3)(OH)2
11.14.5OtwayiteNi2(CO3)(OH)2 · H2O
11.14.6ZaratiteNi3(CO3)(OH)4 · 4H2O ?
11.14.7KambaldaiteNaNi4(CO3)3(OH)3 · 3H2O
11.14.8Glaukosphaerite(Cu,Ni)2(CO3)(OH)2
11.14.9GaspéiteNi(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(H3O)8•3H2O

Other Names for Hellyerite

Name in Other Languages:
German:Hellyerit
Spanish:Hellyerita

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.

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 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
Poland
 
  • Wielkopolskie
    • Poznan
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 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  
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