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About IsokiteHide

white, buff, pale pink
Silky, Pearly
4½ - 5
Specific Gravity:
3.15 - 3.27
Crystal System:
Member of:
Named for the community of Isoka, Zambia, about 24 kilometers west of the type locality.

Classification of IsokiteHide

Approved, 'Grandfathered' (first described prior to 1959)
First Published:

B : Phosphates, etc., with additional anions, without H2O
H : With medium-sized and large cations, (OH,etc.):RO4 = 1:1

5 : (AB)2(XO4)Zq

22 : Phosphates, Arsenates or Vanadates with other Anions
1 : Phosphates, arsenates or vanadates with fluoride

Physical Properties of IsokiteHide

Silky, Pearly
white, buff, pale pink
4½ - 5 on Mohs scale
Very Good
3.15 - 3.27 g/cm3 (Measured)    3.29 g/cm3 (Calculated)

Optical Data of IsokiteHide

Biaxial (+)
RI values:
nα = 1.590 nβ = 1.595 nγ = 1.615
Measured: 51°
Max Birefringence:
δ = 0.025
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 IsokiteHide


Crystallography of IsokiteHide

Crystal System:
Class (H-M):
2/m - Prismatic
Space Group:
Cell Parameters:
a = 6.52 Å, b = 8.75 Å, c = 7.51 Å
β = 121.47°
a:b:c = 0.745 : 1 : 0.858
Unit Cell V:
365.43 ų (Calculated from Unit Cell)
Crystals are flattened on {010}, elongated along {100}.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
3.185 Å(vvs)
3.023 Å(vvs)
2.784 Å(m)
2.630 Å(vvs)
2.586 Å(m)
2.301 Å(s)
1.720 Å(s)
Nkombwa Hill, Zambia

Type Occurrence of IsokiteHide

General Appearance of Type Material:
Spherulites and radiating aggregates of thin plates to a couple millimeters in diameter.
Place of Conservation of Type Material:
Natural History Museum, London, England
Geological Setting of Type Material:
Deans, T., McConnell, J.D.C. (1955) Isokite, CaMgPO4F, a new mineral from Northern Rhodesia. Mineralogical Magazine: 30: 681-690.

Other Language Names for IsokiteHide


Relationship of Isokite to other SpeciesHide

Member of:
Other Members of this group:
DurangiteNaAl(AsO4)FMon. 2/m : B2/b
KononoviteNaMg(SO4)FMon. 2/m : B2/b
LacroixiteNaAl(PO4)FMon. 2/m : B2/b
TilasiteCaMg(AsO4)FMon. m : Bb

Common AssociatesHide

Associated Minerals Based on Photo Data:
3 photos of Isokite associated with StrengiteFePO4 · 2H2O
2 photos of Isokite associated with TripliteMn2+2(PO4)F
1 photo of Isokite associated with PlimeriteZnFe3+4(PO4)3(OH)5

Related Minerals - Nickel-Strunz GroupingHide

8.BH.CrimsonitePbFe3+2(PO4)2(OH)2Orth. mmm (2/m 2/m 2/m) : Cccm
8.BH.05ThadeuiteCa(Mg,Fe2+)3(PO4)2(OH,F)2Orth. 2 2 2 : C2 2 21
8.BH.10DurangiteNaAl(AsO4)FMon. 2/m : B2/b
8.BH.10LacroixiteNaAl(PO4)FMon. 2/m : B2/b
8.BH.10TilasiteCaMg(AsO4)FMon. m : Bb
8.BH.15DrugmanitePb2(Fe3+,Al)(PO4)(PO3OH)(OH)2Mon. 2/m : P21/b
8.BH.20CirroliteCa3Al2(PO4)3(OH)3 (?)
8.BH.20PenikisiteBa(Mg,Fe2+,Ca)2Al2(PO4)3(OH)3Mon. 2/m : P21/m
8.BH.20PerloffiteBa(Mn2+,Fe2+)2Fe3+2(PO4)3(OH)3Mon. 2/m : P21/m
8.BH.20JohntomaiteBaFe2+2Fe3+2(PO4)3(OH)3Mon. 2/m : P21/m
8.BH.30CarminitePbFe3+2(AsO4)2(OH)2Orth. mmm (2/m 2/m 2/m) : Cccm
8.BH.30SewarditeCaFe3+2(AsO4)2(OH)2Orth. mmm (2/m 2/m 2/m) : Cccm
8.BH.35AdeliteCaMg(AsO4)(OH)Orth. 2 2 2 : P21 21 21
8.BH.35ArsendescloizitePbZn(AsO4)(OH)Orth. 2 2 2 : P21 21 21
8.BH.35AustiniteCaZn(AsO4)(OH)Orth. 2 2 2 : P21 21 21
8.BH.35CobaltaustiniteCaCo(AsO4)(OH)Orth. 2 2 2 : P21 21 21
8.BH.35ConichalciteCaCu(AsO4)(OH)Orth. 2 2 2 : P21 21 21
8.BH.35DuftitePbCu(AsO4)(OH)Orth. 2 2 2 : P21 21 21
8.BH.35GabrielsonitePbFe3+(As3+O3)OOrth. mm2 : Pmc21
8.BH.35NickelaustiniteCaNi(AsO4)(OH)Orth. 2 2 2 : P21 21 21
8.BH.35TangeiteCaCu(VO4)(OH)Orth. 2 2 2 : P21 21 21
8.BH.35GottlobiteCaMg(VO4,AsO4)(OH)Orth. 2 2 2 : P21 21 21
8.BH.35HermannroseiteCaCu(PO4)(OH)Orth. 2 2 2 : P21 21 21
8.BH.40ČechitePbFe2+(VO4)(OH)Orth. mmm (2/m 2/m 2/m)
8.BH.40DescloizitePbZn(VO4)(OH)Orth. mmm (2/m 2/m 2/m) : Pnma
8.BH.40MottramitePbCu(VO4)(OH)Orth. mmm (2/m 2/m 2/m) : Pnma
8.BH.40PyrobelonitePbMn2+(VO4)(OH)Orth. mmm (2/m 2/m 2/m) : Pnma
8.BH.45BayldonitePbCu3(AsO4)2(OH)2Mon. 2/m : B2/b
8.BH.45VésigniéiteBaCu3(VO4)2(OH)2Mon. 2/m : B2/m
8.BH.50PaganoiteNiBi(AsO4)OTric. 1 : P1
8.BH.60Attakolite(Ca,Sr)Mn(Al,Fe)4(HPO4,PO4)3(SiO4,PO4)(OH)4Mon. 2/m : B2/m
8.BH.65LeningraditePbCu3(VO4)2ClOrth. mmm (2/m 2/m 2/m) : Ibam

Related Minerals - Dana Grouping (8th Ed.)Hide m : Bb,F)Mon.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

22.1.1AmblygoniteLiAl(PO4)FTric. 1 : P1
22.1.2LacroixiteNaAl(PO4)FMon. 2/m : B2/b
22.1.3NatrophosphateNa7(PO4)2F · 19H2OIso. m3m (4/m 3 2/m) : Fd3c
22.1.5NacaphiteNa2Ca(PO4)FMon. 2/m : P21/b
22.1.6ArctiteNa2Ca4(PO4)3FTrig. 3m (3 2/m) : R3m
22.1.9FluorapatiteCa5(PO4)3FHex. 6/m : P63/m
22.1.10HerderiteCaBe(PO4)FMon. 2/m
22.1.14FluelliteAl2(PO4)F2(OH) · 7H2OOrth. mmm (2/m 2/m 2/m) : Fddd
22.1.15MinyuliteKAl2(PO4)2(OH,F) · 4H2OOrth. mm2 : Pba2
22.1.16MoriniteNaCa2Al2(PO4)2(OH)F4 · 2H2OMon. 2/m
22.1.18FluorstrophiteSrCaSr3(PO4)3FHex. 6/m : P63/m
22.1.20VäyryneniteMn2+Be(PO4)(OH,F)Mon. 2/m : P21/b
22.1.22Wagnerite(Mg,Fe2+)2(PO4)FMon. 2/m : P21/b
22.1.23TripliteMn2+2(PO4)FMon. 2/m
22.1.25ZwieseliteFe2+2(PO4)FMon. 2/m : P21/b
22.1.26McauslaniteFe3Al2(PO4)3(PO3OH)F · 18H2OTric.
22.1.28SvabiteCa5(AsO4)3FHex. 6/mmm (6/m 2/m 2/m) : P63/mmc
22.1.29TilasiteCaMg(AsO4)FMon. m : Bb
22.1.30Johnbaumite-MCa5(AsO4)3OHMon. 2/m : P21/m
22.1.31DurangiteNaAl(AsO4)FMon. 2/m : B2/b

Fluorescence of IsokiteHide

Fluoresces blue under short wave UV

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 IsokiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Mackenzie, R.C. (1955) Mineralogical Society (London). American Mineralogist: 40: 773-780.
Deans, T., McConnell, J.D.C. (1955) Isokite, CaMgPO4F, a new mineral from Northern Rhodesia. Mineralogical Magazine: 30: 681-690.
Fleischer, M. (1956) New mineral names. American Mineralogist: 41: 163-168.
Fisher, D.J. (1957) Isokite and triplite from Bohemia. Mineralogical Magazine: 31: 587-602.
Isaacs, A.M., Peacor, D.R. (1985) Panasqueiraite, a new mineral: the OH-equivalent of isokite. Erratum. The Canadian Mineralogist: 23: 131-131.
Jaffe, H.W., L.W. Hall, Evans, H.T. (1992) Wagnerite and isokite from the Benson Mines, west-central Adirondack Highlands, New York. Mineralogical Magazine: 56: 227.
Hochleitner, R., Fehr, K.T. (2005) Isokite, CaMg[F|PO4], from Senhora de Assunção, Portugal: new find and new data. Neues Jahrbuch für Mineralogie - Abhandlungen: 182: 103-108.
Ercit, T.S., Piilonen, P.C., Locock, A.J., Kolitsch, U., Rowe, R. (2006) New mineral names. American Mineralogist: 91: 1201-1209.
Yang, H., Zwick, J., Downs, R.T., Costin, G. (2007) Isokite, CaMg(PO4)F0.8(OH)0.2, isomorphous with titanite. Acta Crystallographica Section C: 63: 189-190.
Piilonen, P.C., Poirier, G., Tait, K.T. (2008) New mineral names. American Mineralogist: 93: 1686-1691.

Internet Links for IsokiteHide

Localities for IsokiteHide

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.
  • Tasmania
    • Waratah-Wynyard municipality
      • Waratah district
        • Waratah
  • Salzburg
    • St. Johann im Pongau District
      • Pfarrwerfen
A. Strasser: Die Minerale Salzburgs, 1989
A. Strasser: Die Minerale Salzburgs, 1989
A. Strasser: Die Minerale Salzburgs, 1989
  • Bahia
Luiz Menezes
  • Minas Gerais
    • Araxá
Orris, G.J., and Grauch, R.I. (2002): USGS Open-File Report 02-189.; Berger, V.I., Singer, D.A., and Orris, G.J., 2009, Carbonatites of the world, explored deposits of Nb and REE; database and grade and tonnage models: U.S. Geological Survey Open-File Report 2009-1139, 17 p. and database.
Czech Republic
  • Karlovy Vary Region
    • Sokolov District
No reference listed
      • Krásno
Sejkora, J., Škoda, R. and Ondruš, P., 2006: New naturally occurring mineral phases from the Krásno  Horní Slavkov area, western Bohemia, Czech Republic. Journal of the Czech Geological Society, 51, 159-187.; Sejkora, J., Škoda, R., Ondruš, P., Beran, P. & Susser, C. (2006): Mineralogy of phosphate accumulations in the Huber stock, Krásno ore district, Slavkovský les area, Czech Republic. Journal of the Czech Geological Society 51, 103-147.
  • Saxony
    • Erzgebirgskreis
      • Ehrenfriedersdorf
Thomas, R., and Webster, J.D. (2000): Mineralium Deposita 35, 570-582.
  • Telemark
    • Bamble
      • Havredal
        • Midtre Havredal
Analyzed by PXRD by Alf Olav Larsen
RRUFF ID R050519.2 and RRUFF ID: R070526.2 ; Yang, H., Zwick,J. Downs, R. T.& Costin, G. (2007): Isokite, CaMg(PO4)F0.8(OH)0.2, isomorphous with titanite. Acta Crystallographica Section C 63, 189-190
    • Nome
Klockmanns Lehrbuch der Mineralogie, 16th. edition, Stuttgart 1978 p. 631 cited in Neumann, H. (1985): Norges Mineraler. Norges Geologiske Undersøkelse Skrifter 68. p. 119.
  • Castelo Branco
    • Covilhã
Isaac's et al, 1979; Ascenção Guedes, 2002; Bussink, R. W. (1984). Geochemistry of the Panasqueira tungsten-tin deposit, Portugal. Geologica Ultraiectina, 33, 1-170.
      • São Francisco de Assis
  • Guarda
    • Gouveia
      • Folgosinho
Alves, P., Leal Gomes, C., Lopes Nunes, J.E (2012) : Produtos de evolução de triplite-zwieselite, fluorapatite e isokite da mina Sítio do Castelo (Folgosinho, Guarda). II Congresso Jovens Investigadores em Geociências, LEG 2012.
  • Viana do Castelo
    • Ponte da Barca
      • São Lourenço de Touvedo
Leal Gomes, C., Azevedo, A., Lopes Nunes, J., & Dias, P. A. (2009). Phosphate fractionation in pegmatites of Pedra da Moura II claim–Ponte da Barca–Portugal. Estudos Geológicos, 19(2), 172.
  • Viseu
    • Mangualde
    • Penalva do Castelo
      • Sezures
Correia Neves, J.M. (1962), Pegmatito da Região da Venturinha (Penalva do Castelo, Viseu), Memórias e Noticias do Museu e Laboratório Mineralógico e Geológico da Universidade de Coimbra, vol. 54, 1962: 1-135.
    • Sátão
      • Ferreira de Aves
        • Aldeia Nova
Rupert Hochleitner and Karl Thomas Fehr, München, Isokite, CaMg[F|PO4], from Senhora de Assunção, Portugal: New Find and new Data (2008).
  • Castile and Leon
    • Salamanca
      • Navasfrías
  • Community of Madrid
    • Soto del Real
      • San Pedro Massif
        • Rancajales
Gonzalez del Tánago J. (1985) Las Pegmatitas Graníticas de San Pedro, Sistema Central Español. Bol. Soc.Española de Mineralogía, pp.207-2017
  • New York
    • St. Lawrence Co.
NY State Museum spec. no. 19101
        • Benson
Jaffe, H.W. , Hall, L.M. and Evans, H.T. (1992). "Wagnerite with isokite from the Benson Mines, west central Adirondack higlands, New York." Mineralogical Magazine, 56(2),pp:227-233.
Zambia (TL)
  • Muchinga Province
    • Muchinga Mountains
      • Isoka District
        • Isoka
Deans, T., McConnell, J. D. C., & Pickup, R. (1955). Isokite, CaMgPO 4 F, a new mineral from Northern Rhodesia. Mineralogical Magazine and Journal of the Mineralogical Society, 30(230), 681-690., http://www.minersoc.org/pages/Archive-MM/Volume_30/30-230-681.pdf
Mineral and/or Locality  
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