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Fluornatrocoulsellite

A valid IMA mineral species
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09694060017556427173959.jpg
Fluornatrocoulsellite, etc.

Mt Cleveland Mine, Luina, Heazlewood district, Waratah-Wynyard municipality, Tasmania, Australia
06734270017271953265552.jpg
Fluornatrocoulsellite

Mount Somma, Metropolitan City of Naples, Campania, Italy
07740800017271953273399.jpg
Fluornatrocoulsellite

Mount Somma, Metropolitan City of Naples, Campania, Italy
07089460017556361852524.jpg
Fluornatrocoulsellite, etc.

Mt Cleveland Mine, Luina, Heazlewood district, Waratah-Wynyard municipality, Tasmania, Australia
06987250017864770114697.jpg
Fluornatrocoulsellite

Mount Somma, Metropolitan City of Naples, Campania, Italy
07740800017271953273399.jpg
Fluornatrocoulsellite

Mount Somma, Metropolitan City of Naples, Campania, Italy
09694060017556427173959.jpg
Fluornatrocoulsellite, etc.

Mt Cleveland Mine, Luina, Heazlewood district, Waratah-Wynyard municipality, Tasmania, Australia
06734270017271953265552.jpg
Fluornatrocoulsellite

Mount Somma, Metropolitan City of Naples, Campania, Italy
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About FluornatrocoulselliteHide

05595760017272471865632.jpg
Ruth E. Coulsell
Formula:
CaNa3AlMg3F14
Colour:
Colorless
Lustre:
Vitreous
Hardness:
4½
Specific Gravity:
2.99
Crystal System:
Trigonal
Name:
Originally named simply coulsellite in honor of Ruth Elise Coulsell (1912 – 2000), a foundation member and honorary life member of the Mineralogical Society of Victoria. Renamed to fluornatrocoulsellite by Atencio et al. (2017) according to the pyrochlore supergroup naming convention.
Originally named coulsellite, renamed fluornatrocoulsellite (IMA July 2016; Atencio et al., 2017).

A mineral in the Coulsellite Group of 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.

Related to hydrokenoralstonite.

Originally recognized as a Ca-bearing ralstonite-like mineral (UM199O-21-F:AlCaHMgNa) by Birch and Spring (1990). Subsequently fully characterized as a new species by Birch et al. (2009). The crystal structure was solved by Mumme et al. (2010).




Unique IdentifiersHide

Mindat ID:
39766
Long-form identifier:
mindat:1:1:39766:5

IMA Classification of FluornatrocoulselliteHide

IMA status:
Approved
IMA status notes:
Renamed by the IMA
IMA Formula:
(Na1.5Ca0.5)(Mg1.5Al0.5)F6F
Approval year:
2009
Approval history:
Renamed from coulsellite after being moved into the Pyrochlore Supergroup (IMA July 2016.)
Type description reference:
Birch, William D.; Grey, Ian E.; Mumme, W. Gus; Pring, Allan (2009) Coulsellite, a new mineral from the Cleveland mine, Luina, Tasmania. Australian Journal of Mineralogy, 15 (1&2). 21-24

Classification of FluornatrocoulselliteHide

Strunz-mindat (2026):
3.00.

3 : HALIDES
0 :
0 :

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference for Standard
FncIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of FluornatrocoulselliteHide

Lustre:
Vitreous
Transparency:
Transparent, Translucent
Colour:
Colorless
Streak:
White
Hardness:
4½ on Mohs scale
Hardness Data:
Estimated
Tenacity:
Brittle
Cleavage:
None Observed
Parting:
None observed
Fracture:
Conchoidal
Density:
2.99 g/cm3 (Measured)    3.011 g/cm3 (Calculated)

Optical Data of FluornatrocoulselliteHide

Type:
Uniaxial
Comments:
n(average) = 1.40. Pseudo-isotropic.

Chemistry of FluornatrocoulselliteHide

Mindat Formula:
CaNa3AlMg3F14
Element Weights:
Element% weight
F56.005 %
Mg15.353 %
Na14.522 %
Ca8.439 %
Al5.681 %

Calculated from ideal end-member formula.
Elements listed:
Al, Ca, F, Mg, Na - search for minerals with similar chemistry

Chemical AnalysisHide

wt%
 1
Al5.93 %
Ca8.41 %
Mg14.9 %
Na14.2 %
F54.8 %
O1.81 %
P0.49 %
Total:100.54 %
Empirical formulas:
Sample IDEmpirical Formula
1Ca0.98Na2.88Al1.03Mg2.86P0.07F13.47(OH)0.53
Sample references:
IDLocalityReferenceNotes
1Mt Cleveland Mine, Luina, Heazlewood district, Waratah-Wynyard municipality, Tasmania, Australia
Birch, William D.; Grey, Ian E.; Mumme, W. Gus; Pring, Allan (2009) Coulsellite, a new mineral from the Cleveland mine, Luina, Tasmania. Australian Journal of Mineralogy, 15 (1&2). 21-24
Electron microprobe

Crystallography of FluornatrocoulselliteHide

Crystal System:
Trigonal
Class (H-M):
3m(32/m) - Hexagonal Scalenohedral
Space Group:
R3m
Setting:
R3m
Cell Parameters:
a = 7.1756(1) Å
α = 59.867(1)°
Unit Cell V:
260.46 ų (Calculated from Unit Cell)
Z:
1
Morphology:
Pseudo-octahedral crystals, forming crusts.
Forms probably {00.1} and {12.1} for rhombohedral symmetry.
Twinning:
Multiply twinned about threefold axes of the pseudocubic cell.
Comment:
Corresponding hexagonal unit-cell parameters are a = 7.1620(1) Å, c = 17.5972(3) Å.

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0020643FluornatrocoulselliteMumme W G, Grey I E, 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 95 736-7402010Cleveland tin mine, Luina, western Tasmania0293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
2.926 Å(100)
1.791 Å(66)
2.325 Å(33)
1.528 Å(20)
1.949 Å(19)
5.86 Å(12)
3.054 Å(8)

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Near-surface Processes
23 : Subaerial aqueous alteration by non-redox-sensitive fluids (see also #47)
Stage 7: Great Oxidation Event<2.4
45b : [Other oxidized fumarolic minerals]

Type Occurrence of FluornatrocoulselliteHide

Type Locality:
ⓘ Mt Cleveland Mine, Luina, Heazlewood district, Waratah-Wynyard municipality, Tasmania, Australia
General Appearance of Type Material:
Pseudo-octahedral crystals up to 2 mm across.
Place of Conservation of Type Material:
Museum Victoria, Melbourne, Victoria, Australia, number M41450.
Geological Setting of Type Material:
A tin-copper deposit within a complex of Early Cambrian sequence of altered mafic volcanic rocks and sediments.
Associated Minerals at Type Locality:
FluoriteGearksutiteMoriniteOrthoclasePyrite
QuartzSideriteVivianite
Reference:
Birch, William D.; Grey, Ian E.; Mumme, W. Gus; Pring, Allan (2009) Coulsellite, a new mineral from the Cleveland mine, Luina, Tasmania. Australian Journal of Mineralogy, 15 (1&2). 21-24

Synonyms of FluornatrocoulselliteHide

Other Language Names for FluornatrocoulselliteHide

Relationship of Fluornatrocoulsellite to other SpeciesHide

Common AssociatesHide

Associations Based on Photo Data:
6 photos of Fluornatrocoulsellite associated with MoriniteNaCa2Al2(PO4)2(OH)F4 · 2H2O
1 photo of Fluornatrocoulsellite associated with GearksutiteCa[Al(F,OH)5(H2O)]
1 photo of Fluornatrocoulsellite associated with PyriteFeS2

Related Minerals - Strunz-mindat GroupingHide

3.00.Paratacamite-(Mg)Cu3(Mg,Cu)(OH)6Cl2Trig. 3 : R3
3.00.Panichiite(NH4)2SnCl6Iso. m3m(4/m32/m) : Fm3m

Fluorescence of FluornatrocoulselliteHide

In UV light:
Does not fluoresce under UV light.

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.

Internet Links for FluornatrocoulselliteHide

References for FluornatrocoulselliteHide

Localities for FluornatrocoulselliteHide

Showing 6 localities.

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.
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Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Australia (TL)
 
  • Tasmania
    • Waratah-Wynyard municipality
      • Heazlewood district
        • Luina
Birch et al. (1990) +1 other reference
Italy
 
  • Campania
    • Metropolitan City of Naples
Demartin et al. (2014)
      • Ottaviano
Demartin et al. (2014) +1 other reference
Demartin et al. (2014) +1 other reference
Russia
 
  • Zabaykalsky Krai
    • Kalarsky District
Savel’eva et al. (2017)
Spain
 
  • Canary Islands
    • Santa Cruz de Tenerife Province
      • La Palma
        • Cumbre Vieja Area
Campeny et al. (2023)
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