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Isokite

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Formula:
CaMgPO4F
System:
Monoclinic
Colour:
white, buff, pale pink
Lustre:
Silky, Pearly
Hardness:
4½ - 5
Member of:

Classification of Isokite

Approved, 'Grandfathered' (first described prior to 1959)
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 Isokite

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

Optical Data of Isokite

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 Isokite

IMA Formula:
CaMgPO4F
Elements listed in formula:

Crystallography of Isokite

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 Volume:
V 365.43 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Crystals are flattened on {010}, elongated along {100}.
X-Ray Powder Diffraction Data:
d-spacingIntensity
3.185 (vvs)
3.023 (vvs)
2.784 (m)
2.630 (vvs)
2.586 (m)
2.301 (s)
1.720 (s)
Comments:
Nkombwa Hill, Zambia

Type Occurrence of Isokite

Place of Conservation of Type Material:
Natural History Museum, London, England

Relationship of Isokite to other Species

Member of:
Other Members of Group:
DurangiteNaAl(AsO4)F
KononoviteNaMg(SO4)F
LacroixiteNaAl(PO4)F
MaxwelliteNaFe3+(AsO4)F
PanasqueiraiteCaMg(PO4)(OH,F)
TilasiteCaMg(AsO4)F
8.BH.05ThadeuiteCaMg3(PO4)2(OH,F)2
8.BH.10DurangiteNaAlAsO4F
8.BH.10LacroixiteNaAl(PO4)F
8.BH.10MaxwelliteNaFe3+AsO4F
8.BH.10PanasqueiraiteCaMgPO4(OH)
8.BH.10TilasiteCaMgAsO4F
8.BH.15DrugmanitePb2Fe3+(PO4)(PO3OH)(OH)2
8.BH.20BjarebyiteBaMn22+Al2(PO4)3(OH)3
8.BH.20CirroliteCa3Al2(PO4)3(OH)3
8.BH.20KulaniteBaFe22+Al2(PO4)3(OH)3
8.BH.20PenikisiteBaMg2Al2(PO4)3(OH)3
8.BH.20PerloffiteBaMn22+Fe23+(PO4)3(OH)3
8.BH.20JohntomaiteBaFe22+Fe23+(PO4)3(OH)3
8.BH.25BertossaiteLi2CaAl4(PO4)4(OH)4
8.BH.25PalermoiteLi2SrAl4(PO4)4(OH)4
8.BH.30CarminitePbFe23+(AsO4)2(OH)2
8.BH.30SewarditeCaFe23+(AsO4)2(OH)2
8.BH.35AdeliteCaMgAsO4(OH)
8.BH.35ArsendescloizitePbZnAsO4(OH)
8.BH.35AustiniteCaZnAsO4(OH)
8.BH.35CobaltaustiniteCaCoAsO4(OH)
8.BH.35ConichalciteCaCuAsO4(OH)
8.BH.35DuftitePbCuAsO4(OH)
8.BH.35GabrielsonitePbFeAsO4(OH)
8.BH.35NickelaustiniteCaNiAsO4(OH)
8.BH.35TangeiteCaCuVO4(OH)
8.BH.35GottlobiteCaMg(VO4)(OH)
8.BH.35HermannroseiteCaCu(PO4)(OH)
8.BH.40ČechitePbFe2+VO4(OH)
8.BH.40DescloizitePbZnVO4(OH)
8.BH.40MottramitePbCuVO4(OH)
8.BH.40PyrobelonitePbMn2+VO4(OH)
8.BH.45BayldoniteCu3PbO(AsO3OH)2(OH)2
8.BH.45VésigniéiteCu3Ba(VO4)2(OH)2
8.BH.50PaganoiteNiBi3+OAsO4
8.BH.55JagoweriteBaAl2(PO4)2(OH)2
8.BH.60AttakoliteCaMn2+Al4(HSiO4)(PO4)3(OH)4
8.BH.65LeningraditePbCu3(VO4)2Cl2
22.1.1AmblygoniteLiAlPO4F
22.1.2LacroixiteNaAl(PO4)F
22.1.3NatrophosphateNa7(PO4)2F · 19H2O
22.1.5NacaphiteNa2Ca(PO4)F
22.1.6ArctiteNa5Ca7Ba(PO4)6F3
22.1.7NefedoviteNa5Ca4(PO4)4F
22.1.9FluorapatiteCa5(PO4)3F
22.1.10HerderiteCaBePO4F
22.1.12PanasqueiraiteCaMgPO4(OH)
22.1.13BabefphiteBaBePO4F
22.1.14FluelliteAl2(PO4)F2(OH) · 7H2O
22.1.15MinyuliteKAl2(PO4)2F · 4H2O
22.1.16MoriniteNaCa2Al2(PO4)2(OH)F4 · 2H2O
22.1.17BøggilditeNa2Sr2Al2(PO4)F9
22.1.18FluorstrophiteSrCaSr3(PO4)3F
22.1.19ViitaniemiiteNaCaAlPO4F3
22.1.20VäyryneniteMn2+Be(PO4)OH
22.1.21MaxwelliteNaFe3+AsO4F
22.1.22WagneriteMg2PO4F
22.1.23Triplite(Mn2+,Fe2+)2PO4(F,OH)
22.1.24Magniotriplite(Mg,Fe2+,Mn2+)2PO4F
22.1.25ZwieseliteFe2+Mn2+PO4F
22.1.26McauslaniteFe32+Al2(PO4)3(PO3OH)F · 18H2O
22.1.27RichelliteCaFe23+(PO4)2(OH,F)2
22.1.28SvabiteCa5(AsO4)3F
22.1.29TilasiteCaMgAsO4F
22.1.30Johnbaumite-MCa5(AsO4)3OH
22.1.31DurangiteNaAlAsO4F

Other Names for Isokite

Name in Other Languages:
German:Isokit
Spanish:Isokita

Other Information

Fluoresces blue under short wave UV
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 Isokite

Reference List:
Deans, T. and J.D.C. McConnell (1955): "Isokite, a new mineral": Mineralogical Magazine: 30: 681-690. American Mineralogist: 41: 167 (1956) (abstract)

Jaffe, H.W., L.W. Hall, & H.T. Evans (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.

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

Internet Links for Isokite

mindat.org URL:
https://www.mindat.org/min-2054.html
Please feel free to link to this page.

Localities for Isokite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Australia
 
  • Tasmania
    • Waratah-Wynyard municipality
      • Waratah district
        • Waratah
Bottrill
Austria
 
  • Salzburg
    • 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
    • Coromandel district
      • Bagagem River valley
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
 
  • Bohemia (Böhmen; Boehmen)
    • Karlovy Vary Region
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
    • Erzgebirge
      • Ehrenfriedersdorf
Thomas, R., and Webster, J.D. (2000): Mineralium Deposita 35, 570-582.
Norway
 
  • Telemark
    • Bamble (Bamle)
      • 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 District
    • 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 District
    • 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 District
    • 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 District
    • 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
  • 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)
 
  • Northern Province
    • Muchinga Mts.
      • Isoka District
        • Isoka
Mineralogical Magazine(1955) 30, 681-691, http://www.minersoc.org/pages/Archive-MM/Volume_30/30-230-681.pdf
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