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Fluorsigaiite

A valid IMA mineral species
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Formula:
Ca2Sr3(PO4)3F
Colour:
colourless to yellowish white
Lustre:
Vitreous
Hardness:
5
Specific Gravity:
3.842 (Calculated)
Crystal System:
Hexagonal
The Sr analogue of fluorphosphohedyphane (Pb-dominant). Ca2Sr3-analogue of miyahisaite (Sr2Ba3-dominant).

Chemically similar to two other apatite supergroup species, fluorcaphite and fluorstrophite; also compare 'Strontium-bearing Apatite'.

Ca and Sr dominate at the Ca1 and Ca2 sites, respectively.


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Unique IdentifiersHide

Mindat ID:
56027
Long-form identifier:
mindat:1:1:56027:0

IMA Classification of FluorsigaiiteHide

Classification of FluorsigaiiteHide

Strunz-mindat (2026):
8.BN.

8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
N : With only large cations, (OH, etc.):RO4 = 0.33:1

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

Physical Properties of FluorsigaiiteHide

Lustre:
Vitreous
Transparency:
Transparent, Translucent
Colour:
Colourless to yellowish white
Hardness:
5 on Mohs scale
Tenacity:
Brittle
Fracture:
Irregular/Uneven
Density:
3.842 g/cm3 (Calculated)

Optical Data of FluorsigaiiteHide

Type:
Uniaxial (-)
RI values:
nω = 1.64(1) nε = 1.63(1)
Max. Birefringence:
δ = 0.010
Based on recorded range of RI values above.

Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.

Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.

Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.

Surface Relief:
Moderate
Dispersion:
no

Chemistry of FluorsigaiiteHide

Mindat Formula:
Ca2Sr3(PO4)3F
Element Weights:
Element% weight
Sr40.632 %
O29.678 %
P14.364 %
Ca12.390 %
F2.937 %

Calculated from ideal end-member formula.
Elements listed:
Ca, F, O, P, Sr - search for minerals with similar chemistry

Crystallography of FluorsigaiiteHide

Crystal System:
Hexagonal
Class (H-M):
6/m - Dipyramidal
Space Group:
P63/m
Cell Parameters:
a = 9.6101(2) Å, c = 7.1311(1) Å
Ratio:
a:c = 1 : 0.742
Unit Cell V:
570.35 ų (Calculated from Unit Cell)
Z:
2

X-Ray Powder DiffractionHide

Type Occurrence of FluorsigaiiteHide

Type Locality:
ⓘ Fluorsigaiite type locality, Fengcheng City, Dandong, Liaoning, China
General Appearance of Type Material:
individual, prismatic, columnar and platy crystal, 10-50 μm in size; more rarely: prismatic aggregates in interstices
Place of Conservation of Type Material:
mineralogical collections of the Geological Museum of China, No. 16, Yangrou Hu, Xisi, Beijing 100031, People’s Republic of China, catalogue number M16130
Geological Setting of Type Material:
lujavrite; probably formed from Sr-rich fluids at late-magmatic or hydrothermal stage
Associated Minerals at Type Locality:
AegirineCalciteEudialyteFluorapatiteFluorstrophite
MicroclineNatroliteNephelineStronadelphite
Reference:
Wu, Bin, Gu, Xiang-ping, Rao, Can, Wang, Ru-cheng, Xing, Xing-qing, Zhong, Fu-jun, Wan, Jian-jun, Bonnetti, Christophe (2022) Fluorsigaiite, Ca2Sr3(PO4)3F, a new mineral of the apatite supergroup from the Saima alkaline complex, Liaoning Province, China. Mineralogical Magazine, 86 (6) 940-947 doi:10.1180/mgm.2022.96

Synonyms of FluorsigaiiteHide

Other Language Names for FluorsigaiiteHide

Relationship of Fluorsigaiite to other SpeciesHide

Member of:
Hedyphane Group > Apatite Supergroup
Other Members of Hedyphane Group:
AiolositeNa4Bi(SO4)3ClHex. 6/m : P63/m
CaracoliteNa3Pb2(SO4)3ClMon. 2/m : P21/m
CesaniteNa3Ca2(SO4)3(OH)Hex. 6 : P6
FluorphosphohedyphaneCa2Pb3(PO4)3FHex. 6/m : P63/m
HedyphaneCa2Pb3(AsO4)3ClHex. 6/mmm(6/m2/m2/m) : P63/mmc
HydroxylhedyphaneCa2Pb3(AsO4)3(OH)Trig. 3 : P3
Miyahisaite(Sr,Ca)2Ba3(PO4)3F Hex. 6/m : P63/m
MorelanditeCa2Ba3(AsO4)3ClHex.
ParafiniukiteCa2Mn3(PO4)3ClHex. 6/m : P63/m
PhosphohedyphaneCa2Pb3(PO4)3ClHex. 6/m : P63/m
'UM2002-53-PO:CaHPb'Ca2Pb3(PO4)3(OH,Cl,F)

Related Minerals - Strunz-mindat GroupingHide

8.BN.FluoralforsiteBa5(PO4)3FHex. 6/m : P6/m
8.BN.AraditeBaCa6[(SiO4)(VO4)](VO4)2FTrig. 3m : R3m
8.BN.MagganasiteCuFe3+3O(AsO4)3Tric. 1 : P1
8.BN.FluorpyromorphitePb5(PO4)3FHex. 6/m : P63/m
8.BN.05PieczkaiteMn5(PO4)3ClHex. 6/m : P63/m
8.BN.05FluorapatiteCa5(PO4)3FHex. 6/m : P63/m
8.BN.05FluorcaphiteSrCaCa3(PO4)3FHex. 6/m : P63/m
8.BN.05VanadinitePb5(VO4)3ClHex. 6/m : P63/m
8.BN.05HedyphaneCa2Pb3(AsO4)3ClHex. 6/mmm(6/m2/m2/m) : P63/mmc
8.BN.05HydroxylhedyphaneCa2Pb3(AsO4)3(OH)Trig. 3 : P3
8.BN.05'Mimetite-M'Pb5(AsO4)3ClMon. 2/m : P21/b
8.BN.05JohnbaumiteCa5(AsO4)3(OH)Hex. 6/m : P63/m
8.BN.05PliniusiteCa5(VO4)3FHex. 6/m : P63/m
8.BN.05'Hydroxylapatite-M'Ca5(PO4)3OHMon. 2/m : P21/b
8.BN.05HydroxylpyromorphitePb5(PO4)3(OH)Hex. 6/mmm(6/m2/m2/m) : P63/mcm
8.BN.05Miyahisaite(Sr,Ca)2Ba3(PO4)3F Hex. 6/m : P63/m
8.BN.05Carlgieseckeite-(Nd)NaNdCa3(PO4)3FTrig. 3 : P3
8.BN.05Belovite-(Ce)NaCeSr3(PO4)3FTrig. 3 : P3
8.BN.05Kuannersuite-(Ce)NaCeBa3(PO4)3F0.5Cl0.5Trig. 3 : P3
8.BN.05AlforsiteBa5(PO4)3ClHex. 6/m : P63/m
8.BN.05'Unnamed (OH-analogue of Mimetite)'Pb5(AsO4)3(OH)Hex. 6/m : P63/m
8.BN.05StronadelphiteSr5(PO4)3FHex. 6/m : P63/m
8.BN.05ParafiniukiteCa2Mn3(PO4)3ClHex. 6/m : P63/m
8.BN.05MimetitePb5(AsO4)3ClHex. 6/m : P63/m
8.BN.05 va'Germanate-pyromorphite'Pb5(PO4)2GeO4
8.BN.05Belovite-(La)NaLaSr3(PO4)3FTrig. 3 : P3
8.BN.05FluorphosphohedyphaneCa2Pb3(PO4)3FHex. 6/m : P63/m
8.BN.05FluorstrophiteSrCaSr3(PO4)3FHex. 6/m : P63/m
8.BN.05HydroxylapatiteCa5(PO4)3(OH)Hex. 6/m : P63/m
8.BN.05'Johnbaumite-M'Ca5(AsO4)3OHMon. 2/m : P21/m
8.BN.05PhosphohedyphaneCa2Pb3(PO4)3ClHex. 6/m : P63/m
8.BN.05TurneaureiteCa5(AsO4)3ClHex. 6/m : P63/m
8.BN.05MorelanditeCa2Ba3(AsO4)3ClHex.
8.BN.05'Oxypyromorphite'Pb10(PO4)6O
8.BN.05Deloneite(Na0.5REE0.25Ca0.25)(Ca0.75REE0.25)Sr1.5(CaNa0.25REE0.25)(PO4)3F0.5(OH)0.5Trig. 3 : P3
8.BN.05ChlorapatiteCa5(PO4)3ClHex. 6/m : P63/m
8.BN.05PyromorphitePb5(PO4)3ClHex. 6/m : P63/m
8.BN.05VanackeritePb4Cd(AsO4)3ClTrig. 3 : P3
8.BN.05SvabiteCa5(AsO4)3FHex. 6/mmm(6/m2/m2/m) : P63/mmc
8.BN.10ArctiteNa2Ca4(PO4)3FTrig. 3m(32/m) : R3m
8.BN.10KrügeriteBaCa6(SiO4)2[(P0.5S0.5)O4]2FTrig. 3m(32/m) : R3m
8.BN.15GoryainoviteCa2(PO4)ClOrth. mmm(2/m2/m2/m) : Pbcm

Fluorescence of FluorsigaiiteHide

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 FluorsigaiiteHide

References for FluorsigaiiteHide

Localities for FluorsigaiiteHide

Showing 4 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
 
  • Tasmania
    • Huon Valley municipality
      • Huon-Channel region
        • Cygnet district
Bottrill (2021)
China (TL)
 
  • Liaoning
    • Dandong
      • Fengcheng City
Miyawaki et al. (2022)
      • Kuandian County
Wu et al. (2023)
Czech Republic
 
  • Karlovy Vary Region
    • Cheb District
      • Ovesné Kladruby
Jirasek et al. (2026)
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