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Isokite

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About IsokiteHide

Formula:
CaMg(PO4)F
Colour:
white, buff, pale pink
Lustre:
Silky, Pearly
Hardness:
4½ - 5
Specific Gravity:
3.15 - 3.27
Crystal System:
Monoclinic
Member of:
Name:
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:
1955
8.BH.10

8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
H : With medium-sized and large cations, (OH,etc.):RO4 = 1:1
41.5.6.2

41 : ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
5 : (AB)2(XO4)Zq
22.1.11

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

Physical Properties of IsokiteHide

Silky, Pearly
Transparency:
Translucent
Colour:
white, buff, pale pink
Hardness:
4½ - 5 on Mohs scale
Tenacity:
Brittle
Cleavage:
Very Good
{010}
Density:
3.15 - 3.27 g/cm3 (Measured)    3.29 g/cm3 (Calculated)

Optical Data of IsokiteHide

Type:
Biaxial (+)
RI values:
nα = 1.590 nβ = 1.595 nγ = 1.615
2V:
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:
Moderate
Dispersion:
r > v distinct

Chemical Properties of IsokiteHide

Formula:
CaMg(PO4)F

Crystallography of IsokiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/b
Cell Parameters:
a = 6.52 Å, b = 8.75 Å, c = 7.51 Å
β = 121.47°
Ratio:
a:b:c = 0.745 : 1 : 0.858
Unit Cell V:
365.43 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Crystals are flattened on {010}, elongated along {100}.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
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)
Comments:
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:
Carbonatite
Reference:
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

German:Isokit
Spanish:Isokita

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
MaxwelliteNaFe3+(AsO4)FMon.
PanasqueiraiteCaMg(PO4)(OH,F)Mon.
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.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.10MaxwelliteNaFe3+(AsO4)FMon.
8.BH.10PanasqueiraiteCaMg(PO4)(OH,F)Mon.
8.BH.10TilasiteCaMg(AsO4)FMon. m : Bb
8.BH.15DrugmanitePb2(Fe3+,Al)(PO4)(PO3OH)(OH)2Mon. 2/m : P21/b
8.BH.20Bjarebyite(Ba,Sr)(Mn2+,Fe2+,Mg)2Al2(PO4)3(OH)3Mon.
8.BH.20CirroliteCa3Al2(PO4)3(OH)3 (?)
8.BH.20KulaniteBa(Fe2+,Mn2+,Mg)2(Al,Fe3+)2(PO4)3(OH)3Mon.
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.25Bertossaite(Li,Na)2(Ca,Fe2+,Mn2+)Al4(PO4)4(OH,F)4Orth.
8.BH.25Palermoite(Li,Na)2(Sr,Ca)Al4(PO4)4(OH)4Orth.
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.55JagoweriteBaAl2(PO4)2(OH)2Tric.
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

41.5.6.1TilasiteCaMg(AsO4)FMon. m : Bb
41.5.6.3PanasqueiraiteCaMg(PO4)(OH,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
22.1.7NefedoviteNa5Ca4(PO4)4FTric.
22.1.9FluorapatiteCa5(PO4)3FHex. 6/m : P63/m
22.1.10HerderiteCaBePO4(F,OH)Mon. 2/m
22.1.12PanasqueiraiteCaMg(PO4)(OH,F)Mon.
22.1.13BabefphiteBaBePO4(F,OH)Tet.
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
22.1.17BøggilditeNa2Sr2Al2PO4F9Mon.
22.1.18FluorstrophiteSrCaSr3(PO4)3FHex. 6/m : P63/m
22.1.19ViitaniemiiteNa(Ca,Mn2+)Al(PO4)(F,OH)3Mon.
22.1.20VäyryneniteMn2+Be(PO4)(OH,F)Mon. 2/m : P21/b
22.1.21MaxwelliteNaFe3+(AsO4)FMon.
22.1.22Wagnerite(Mg,Fe2+)2(PO4)FMon. 2/m : P21/b
22.1.23TripliteMn2+2(PO4)FMon. 2/m
22.1.24Magniotriplite(Mg,Fe2+,Mn2+)2PO4FMon.
22.1.25ZwieseliteFe2+2(PO4)FMon. 2/m : P21/b
22.1.26McauslaniteFe3Al2(PO4)3(PO3OH)F · 18H2OTric.
22.1.27RichelliteCaFe3+2(PO4)2(OH,F)2Amor.
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.
Australia
 
  • Tasmania
    • Waratah-Wynyard municipality
      • Waratah district
        • Waratah
Bottrill
Austria
 
  • Salzburg
    • St. Johann im Pongau District
      • Werfen
        • Pfarrwerfen
A. Strasser: Die Minerale Salzburgs, 1989
A. Strasser: Die Minerale Salzburgs, 1989
A. Strasser: Die Minerale Salzburgs, 1989
Brazil
 
  • 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 (Schönfeld)
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.
Germany
 
  • Saxony
    • Erzgebirgskreis
      • Ehrenfriedersdorf
Thomas, R., and Webster, J.D. (2000): Mineralium Deposita 35, 570-582.
Norway
 
  • Telemark
    • Bamble
      • Havredal (Hafredal)
        • 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
      • Fen Complex
Klockmanns Lehrbuch der Mineralogie, 16th. edition, Stuttgart 1978 p. 631 cited in Neumann, H. (1985): Norges Mineraler. Norges Geologiske Undersøkelse Skrifter 68. p. 119.
Portugal
 
  • 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).
Spain
 
  • Castile and Leon
    • Salamanca
      • Navasfrías
http://www.foro-minerales.com/forum/viewtopic.php?p=85470#85470
  • 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
USA
 
  • 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
 
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