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Specific Gravity:
3.011 (Calculated)
Crystal System:
For Ruth Elise Coulsell (1912–2000), a foundation member and honorary life member of the Mineralogical Society of Victoria.
Originally named coulsellite, renamed fluornatrocoulsellite (IMA July 2016; Atencio et al., 2017).

A rhombohedral mineral in the Pyrochlore Supergroup.
Appears to be unique among published pyrochlore phases in having a 1:3 ordering of metal atoms Ca:Na in the A sites and Al:Mg in the B sites.

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Classification of FluornatrocoulselliteHide

Renamed by the IMA
Approval Year:
Approval History:
Renamed from coulsellite after being moved into the Pyrochlore Supergroup (IMA July 2016.)

0 :
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Physical Properties of FluornatrocoulselliteHide

3.011 g/cm3 (Calculated)

Chemical Properties of FluornatrocoulselliteHide

IMA Formula:

Crystallography of FluornatrocoulselliteHide

Crystal System:
Class (H-M):
3m (3 2/m) - Hexagonal Scalenohedral
Space Group:
Cell Parameters:
a = 7.1756(1) Å
α = 59.867(1)°
Unit Cell V:
260.46 ų (Calculated from Unit Cell)
multiply twinned about threefold axes of the pseudocubic cell.
corresponding hexagonal cell parameters are a = 7.1620(1) Å, c = 17.5972(3) Å.

Type Occurrence of FluornatrocoulselliteHide

Synonyms of FluornatrocoulselliteHide

Relationship of Fluornatrocoulsellite to other SpeciesHide

Related Minerals - Nickel-Strunz GroupingHide

3.00.Panichiite(NH4)2SnCl6Iso. m3m (4/m 3 2/m) : Fm3m
3.00.Paratacamite-(Mg)Cu3(Mg,Cu)(OH)6Cl2Trig. 3 : R3

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 FluornatrocoulselliteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Birch W D, Grey I E, Mumme W G, Pring A (2009) Coulsellite, a new mineral from the Cleveland mine, Luina, Tasmania. Australian Journal of Mineralogy 15, 21-24
Grey, I.E., Mumme, W.G., Birch, W.D., Pring, A., Bougerol, C., Wilson, N.C. (2010): Coulsellite, CaNa3AlMg3F14, a rhombohedral pyrochlore with 1:3 ordering in both A and B sites, from the Cleveland Mine, Tasmania, Australia. American Mineralogist, 95, 736-740.

Internet Links for FluornatrocoulselliteHide

Localities for FluornatrocoulselliteHide

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
        • Luina
Grey, I.E., Mumme, W.G., Birch, W.D., Pring, A., Bougerol, C., Wilson, N.C. (2010): Coulsellite, CaNa3AlMg3F14, a rhombohedral pyrochlore with 1:3 ordering in both A and B sites, from the Cleveland Mine, Tasmania, Australia. American Mineralogist, 95, 736-740.
  • Campania
    • Naples Province
      • Somma-Vesuvius Complex
Demartin, F., Campostrini, I., Castellano, C., & Russo, M. (2014). Parascandolaite, KMgF3, a new perovskite-type fluoride from Vesuvius. Physics and chemistry of minerals, 41(6), 403-407.
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