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Isokite

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Big Photo

Sauberg Mine, Ehrenfriedersdorf, Erzgebirge, Saxony, Germany
© Thomas Witzke

Show Isokite Photos (4)



Formula:
CaMg(PO
 
4
)F
System:MonoclinicColour:white, buff, pale pink
Hardness:4½ - 5
Member of:Tilasite Group


Tilasite Group.

Classification of Isokite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:7/B.25-10
Nickel-Strunz 10th (pending) edition ID: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
Dana 8th edition ID:41.5.6.2

41 : ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
5 : (AB)2(XO4)Zq
Hey's CIM Ref.:22.1.11

22 : Phosphates, Arsenates or Vanadates with other Anions
1 : Phosphates, arsenates or vanadates with fluoride
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Type Occurrence of Isokite

Type Locality:Nkumbwa Hill Carbonatite (Nkombwa Hill Carbonatite), Isoka, Isoka District, Muchinga Mts., Northern Province, Zambia
Place of Conservation of Type Material:Natural History Museum, London, England

Physical Properties of Isokite

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

Crystallography of Isokite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:B2/b {B1 1 2/b} {C2/c} {C1 2/c 1}
Cell Parameters:a = 6.52Å, b = 8.75Å, c = 7.51Å
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:
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

Optical Data of Isokite

Type:Biaxial (+)
RI values: nα = 1.590 nβ = 1.595 nγ = 1.615
2V:Measured: 51°
Maximum Birefringence:δ = 0.025

Chart 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

Formula:
CaMg(PO
 
4
)F
Essential elements:Ca, F, Mg, O, P
All elements listed in formula:Ca, F, Mg, O, P

Relationship of Isokite to other Species

Member of:Tilasite Group
Other Members of Group:

- +
Durangite
NaAl(AsO
 
4
)F
Maxwellite
NaFe
3+
 
(AsO
 
4
)F
Panasqueiraite
CaMg(PO
 
4
)(OH,F)
Tilasite
CaMg(AsO
 
4
)F
Related Minerals - Nickel-Strunz Grouping):

- +
8.BH.05Thadeuite
Ca(Mg,Fe
2+
 
)
 
3
(PO
 
4
)
 
2
(OH,F)
 
2
8.BH.10Durangite
NaAl(AsO
 
4
)F
8.BH.10Lacroixite
NaAl(PO
 
4
)F
8.BH.10Maxwellite
NaFe
3+
 
(AsO
 
4
)F
8.BH.10Panasqueiraite
CaMg(PO
 
4
)(OH,F)
8.BH.10Tilasite
CaMg(AsO
 
4
)F
8.BH.15Drugmanite
Pb(Fe
3+
 
,Al)
 
2
(PO
 
4
)
 
2
(OH)
 
2
8.BH.20Bjarebyite
(Ba,Sr)(Mn
2+
 
,Fe
2+
 
,Mg)
 
2
Al
 
2
(PO
 
4
)
 
3
(OH)
 
3
8.BH.20Cirrolite
Ca
 
3
Al
 
2
(PO
 
4
)
 
3
(OH)
 
3
 (?)
8.BH.20Kulanite
Ba(Fe
2+
 
,Mn
2+
 
,Mg)
 
2
(Al,Fe
3+
 
)
 
2
(PO
 
4
)
 
3
(OH)
 
3
8.BH.20Penikisite
Ba(Mg,Fe
2+
 
,Ca)
 
2
Al
 
2
(PO
 
4
)
 
3
(OH)
 
3
8.BH.20Perloffite
Ba(Mn
2+
 
,Fe
2+
 
)
 
2
Fe
3+
2
(PO
 
4
)
 
3
(OH)
 
3
8.BH.20Johntomaite
BaFe
2+
2
Fe
3+
2
(PO
 
4
)
 
3
(OH)
 
3
8.BH.25Bertossaite
(Li,Na)
 
2
(Ca,Fe
2+
 
,Mn
2+
 
)Al
 
4
(PO
 
4
)
 
4
(OH,F)
 
4
8.BH.25Palermoite
(Li,Na)
 
2
(Sr,Ca)Al
 
4
(PO
 
4
)
 
4
(OH)
 
4
8.BH.30Carminite
PbFe
3+
2
(AsO
 
4
)
 
2
(OH)
 
2
8.BH.30Sewardite
CaFe
3+
2
(AsO
 
4
)
 
2
(OH)
 
2
8.BH.35Adelite
CaMg(AsO
 
4
)(OH)
8.BH.35Arsendescloizite
PbZn(AsO
 
4
)(OH)
8.BH.35Austinite
CaZn(AsO
 
4
)(OH)
8.BH.35Cobaltaustinite
CaCo(AsO
 
4
)(OH)
8.BH.35Conichalcite
CaCu(AsO
 
4
)(OH)
8.BH.35Duftite
PbCu(AsO
 
4
)(OH)
8.BH.35Gabrielsonite
PbFe(AsO
 
4
)(OH)
8.BH.35Nickelaustinite
Ca(Ni,Zn)(AsO
 
4
)(OH)
8.BH.35Tangeite
CaCu(VO
 
4
)(OH)
8.BH.35Gottlobite
CaMg(VO
 
4
,AsO
 
4
)(OH)
8.BH.35Hermannroseite
CaCu(PO
 
4
)(OH)
8.BH.40Čechite
Pb(Fe
2+
 
,Mn
2+
 
)(VO
 
4
)(OH)
8.BH.40Descloizite
Pb(Zn,Cu)(VO
 
4
)(OH)
8.BH.40Mottramite
PbCu(VO
 
4
)(OH)
8.BH.40Pyrobelonite
PbMn
2+
 
(VO
 
4
)(OH)
8.BH.45Bayldonite
Cu
 
3
Pb(AsO
 
4
)
 
2
(OH)
 
2
8.BH.45Vésigniéite
BaCu
 
3
(VO
 
4
)
 
2
(OH)
 
2
8.BH.50Paganoite
NiBi(AsO
 
4
)O
8.BH.55Jagowerite
BaAl
 
2
(PO
 
4
)
 
2
(OH)
 
2
8.BH.55Carlgieseckeite-(Nd)
NaNdCa
 
3
(PO
 
4
)
 
3
F
8.BH.60Attakolite
(Ca,Sr)Mn(Al,Fe)
 
4
(HPO
 
4
,PO
 
4
)
 
3
(SiO
 
4
,PO
 
4
)(OH)
 
4
8.BH.65Leningradite
PbCu
 
3
(VO
 
4
)
 
2
Cl
Related Minerals - Hey's Index Grouping:

- +
22.1.1Amblygonite
LiAl(PO
 
4
)F
22.1.2Lacroixite
NaAl(PO
 
4
)F
22.1.3Natrophosphate
Na
 
7
(PO
 
4
)
 
2
F · 19H
 
2
O
22.1.5Nacaphite
Na
 
2
Ca(PO
 
4
)F
22.1.6Arctite
Na
 
2
Ca
 
4
(PO
 
4
)
 
3
F
22.1.7Nefedovite
Na
 
5
Ca
 
4
(PO
 
4
)
 
4
F
22.1.9Fluorapatite
Ca
 
5
(PO
 
4
)
 
3
F
22.1.10Herderite
CaBePO
 
4
(F,OH)
22.1.12Panasqueiraite
CaMg(PO
 
4
)(OH,F)
22.1.13Babefphite
BaBePO
 
4
(F,OH)
22.1.14Fluellite
Al
 
2
(PO
 
4
)(OH)F
 
2
 · 7H
 
2
O
22.1.15Minyulite
KAl
 
2
(PO
 
4
)
 
2
(OH,F) · 4H
 
2
O
22.1.16Morinite
Na
 
2
Ca
 
4
Al
 
4
(PO
 
4
)
 
4
(F,OH)
 
10
 · 3H
 
2
O
22.1.17Bøggildite
Na
 
2
Sr
 
2
Al
 
2
PO
 
4
F
 
9
22.1.18Fluorstrophite
SrCaSr
 
3
(PO
 
4
)
 
3
F
22.1.19Viitaniemiite
Na(Ca,Mn
2+
 
)Al(PO
 
4
)(F,OH)
 
3
22.1.20Väyrynenite
Mn
2+
 
BePO
 
4
(OH,F)
22.1.21Maxwellite
NaFe
3+
 
(AsO
 
4
)F
22.1.22Wagnerite
(Mg,Fe
2+
 
)
 
2
(PO
 
4
)F
22.1.23Triplite
(Mn
2+
 
,Fe
2+
 
)
 
2
(PO
 
4
)(F,OH)
22.1.24Magniotriplite
(Mg,Fe
2+
 
,Mn
2+
 
)
 
2
PO
 
4
F
22.1.25Zwieselite
Fe
2+
 
Mn
2+
 
(PO
 
4
)F
22.1.26Mcauslanite
HFe
2+
3
Al
 
2
(PO
 
4
)
 
4
F · 18H
 
2
O
22.1.27Richellite
CaFe
3+
2
(PO
 
4
)
 
2
(OH,F)
 
2
22.1.28Svabite
Ca
 
5
(AsO
 
4
)
 
3
F
22.1.29Tilasite
CaMg(AsO
 
4
)F
22.1.30Johnbaumite-M
Ca
 
5
(AsO
 
4
)
 
3
OH
22.1.31Durangite
NaAl(AsO
 
4
)F

Other Names for Isokite

Other Languages:
German:Isokit
Spanish:Isokita

Other Information

Fluorescence in UV light:Fluoresces blue under short wave UV
Health Warning: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

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Isokite details from Handbook of Mineralogy (PDF)
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    • Localities for Isokite

    The 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.
    Hide Locality List
    (TL) indicates type locality. ? 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 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
      • Araxá
    		Orris, G.J., and Grauch, R.I. (2002): USGS Open-File Report 02-189.
    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)
    		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); Neumann (1985, p. 119).
    Portugal
     
    • Castelo Branco District
      • Covilhã
        • Panasqueira
    • 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
    		Luis Martins colection; International Geological Congress (2008) MRD-06 Geology and geoeconomical potential of pegmatite deposits: A case study
    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
     
    • Northern Province
      • Muchinga Mts.
        • Isoka District
          • Isoka
    		Min.Mag.(1955) 30, 681-691
    Mineral and/or Locality
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