Isokite
A valid IMA mineral species - grandfathered
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About Isokite
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.
Tilasite Group; the F-analogue of panasqueiraite.
Tilasite-isokite series is known from the Tolbachik volcano.
Tilasite-isokite series is known from the Tolbachik volcano.
Unique Identifiers
Mindat ID:
2054
Long-form identifier:
mindat:1:1:2054:7
GUID
(UUID V4):
(UUID V4):
9da77eaa-eab0-4ea1-8018-ca9aa5140e23
IMA Classification of Isokite
Approved, 'Grandfathered' (first described prior to 1959)
First published:
1955
Classification of Isokite
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
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
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
22 : Phosphates, Arsenates or Vanadates with other Anions
1 : Phosphates, arsenates or vanadates with fluoride
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Iso | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Isokite
Silky, Pearly
Transparency:
Translucent
Colour:
white, buff, pale pink
Hardness:
4½ - 5 on Mohs scale
Tenacity:
Brittle
Cleavage:
Very Good
{010}
{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.
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
r > v distinct
Chemistry of Isokite
Mindat Formula:
CaMg(PO4)F
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°
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}.
Crystal Structure
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2x2x2 | 3x3x3 | 4x4x4
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0010337 | Isokite | Yang H, Zwick J, Downs R T, Costin G (2007) Isokite, CaMg(PO4)F0.8(OH)0.2, isomorphous with titanite Acta Crystallographica C63 i89-i90 |  | 2007 | Kjorrestad, near Bamle, Norway | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 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
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 34 : Complex granite pegmatites | |
| 36 : Carbonatites, kimberlites, and related igneous rocks | |
| Stage 7: Great Oxidation Event | <2.4 |
| 47c : [Carbonates, phosphates, borates, nitrates] | |
| 47g : [Halogen-bearing surface weathering minerals] |
Type Occurrence of Isokite
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 Isokite
Relationship of Isokite to other Species
Member of:
Other Members of this group:
| Arsenatrotitanite | NaTi(AsO4)O | Mon. 2/m : B2/b |
| Durangite | NaAl(AsO4)F | Mon. 2/m : B2/b |
| Kononovite | NaMg(SO4)F | Mon. 2/m : B2/b |
| Lacroixite | NaAl(PO4)F | Mon. 2/m : B2/b |
| Maxwellite | NaFe3+(AsO4)F | Mon. 2/m : P2/m |
| Panasqueiraite | CaMg(PO4)(OH,F) | Mon. |
| Reznitskyite | CaMg(VO4)F | Mon. 2/m : B2/b |
| Tilasite | CaMg(AsO4)F | Mon. |
| Tilasite-Isokite Series |
Forms a series with:
Common Associates
Associated Minerals Based on Photo Data:
| 4 photos of Isokite associated with Strengite | FePO4 · 2H2O |
| 3 photos of Isokite associated with Wagnerite | (Mg,Fe2+)2(PO4)F |
| 2 photos of Isokite associated with Triplite | Mn2+2(PO4)F |
| 1 photo of Isokite associated with Plimerite | ZnFe3+4(PO4)3(OH)5 |
| 1 photo of Isokite associated with Rutile | TiO2 |
| 1 photo of Isokite associated with Lun'okite | (Mn,Ca)(Mg,Fe,Mn)Al(PO4)2OH · 4H2O |
| 1 photo of Isokite associated with Phosphosiderite | FePO4 · 2H2O |
Related Minerals - Strunz-mindat Grouping
| 8.BH. | Crimsonite | PbFe3+2(PO4)2(OH)2 |
| 8.BH. | Reznitskyite | CaMg(VO4)F |
| 8.BH. | Cuprozheshengite | Pb4CuZn2(AsO4)2(PO4)2(OH)2 |
| 8.BH. | Zheshengite | Pb4ZnZn2(AsO4)2(PO4)2(OH)2 |
| 8.BH. | Peterchinite | Zn3Zn2(OH)6As[O3(OH)3] |
| 8.BH.05 | Thadeuite | Ca(Mg,Fe2+)3(PO4)2(OH,F)2 |
| 8.BH.10 | Durangite | NaAl(AsO4)F |
| 8.BH.10 | Lacroixite | NaAl(PO4)F |
| 8.BH.10 | Maxwellite | NaFe3+(AsO4)F |
| 8.BH.10 | Panasqueiraite | CaMg(PO4)(OH,F) |
| 8.BH.10 | Kononovite | NaMg(SO4)F |
| 8.BH.10 | Arsenatrotitanite | NaTi(AsO4)O |
| 8.BH.15 | Drugmanite | Pb2(Fe3+,Al)(PO4)(PO3OH)(OH)2 |
| 8.BH.20 | Bjarebyite | (Ba,Sr)(Mn2+,Fe2+,Mg)2Al2(PO4)3(OH)3 |
| 8.BH.20 | Cirrolite | Ca3Al2(PO4)3(OH)3 (?) |
| 8.BH.20 | Kulanite | Ba(Fe2+,Mn2+,Mg)2(Al,Fe3+)2(PO4)3(OH)3 |
| 8.BH.20 | Penikisite | Ba(Mg,Fe2+,Ca)2Al2(PO4)3(OH)3 |
| 8.BH.20 | Perloffite | Ba(Mn2+,Fe2+)2Fe3+2(PO4)3(OH)3 |
| 8.BH.20 | Johntomaite | BaFe2+2Fe3+2(PO4)3(OH)3 |
| 8.BH.20 | Bjarebyite Group | |
| 8.BH.20 | Strontioperloffite | SrMn2+2Fe3+2(PO4)3(OH)3 |
| 8.BH.20 | Plumboperloffite | PbMn2+2Fe3+2(PO4)3(OH)3 |
| 8.BH.25 | Bertossaite | (Li,Na)2(Ca,Fe2+,Mn2+)Al4(PO4)4(OH,F)4 |
| 8.BH.25 | Palermoite | (Li,Na)2(Sr,Ca)Al4(PO4)4(OH)4 |
| 8.BH.25 | Natropalermoite | Na2SrAl4(PO4)4(OH)4 |
| 8.BH.30 | Carminite | PbFe3+2(AsO4)2(OH)2 |
| 8.BH.30 | Sewardite | CaFe3+2(AsO4)2(OH)2 |
| 8.BH.35 | Adelite | CaMg(AsO4)(OH) |
| 8.BH.35 | Arsendescloizite | PbZn(AsO4)(OH) |
| 8.BH.35 | Austinite | CaZn(AsO4)(OH) |
| 8.BH.35 | Cobaltaustinite | CaCo(AsO4)(OH) |
| 8.BH.35 | Conichalcite | CaCu(AsO4)(OH) |
| 8.BH.35 | Duftite | PbCu(AsO4)(OH) |
| 8.BH.35 | Gabrielsonite | PbFe3+(As3+O3)O |
| 8.BH.35 | Nickelaustinite | CaNi(AsO4)(OH) |
| 8.BH.35 | Tangeite | CaCu(VO4)(OH) |
| 8.BH.35 | Duftite-alpha | PbCu(AsO4)(OH) |
| 8.BH.35 | Gottlobite | CaMg(VO4)(OH) |
| 8.BH.35 | Hermannroseite | CaCu(PO4)(OH) |
| 8.BH.40 | Čechite | PbFe2+(VO4)(OH) |
| 8.BH.40 | Descloizite | PbZn(VO4)(OH) |
| 8.BH.40 | Mottramite | PbCu(VO4)(OH) |
| 8.BH.40 | Pyrobelonite | PbMn2+(VO4)(OH) |
| 8.BH.40 | Khorixasite | (Bi0.67◻0.33)Cu(VO4)(OH) |
| 8.BH.45 | Bayldonite | PbCu3(AsO4)2(OH)2 |
| 8.BH.45 | Vésigniéite | BaCu3(VO4)2(OH)2 |
| 8.BH.50 | Paganoite | NiBi(AsO4)O |
| 8.BH.55 | Harrisonite | Ca(Fe2+,Mg)6(PO4)2(SiO4)2 |
| 8.BH.55 | Jagowerite | BaAl2(PO4)2(OH)2 |
| 8.BH.60 | Attakolite | CaMn2+Al4(SiO3OH)(PO4)3(OH)4 |
| 8.BH.65 | Leningradite | PbCu3(VO4)2Cl |
| 8.BH.70 | Katiarsite | KTiO(AsO4) |
| 8.BH.70 | Yurgensonite | K2SnTiO2(AsO4)2 |
| 8.BH.75 | Melanarsite | K3Cu7Fe3+O4(AsO4)4 |
| 8.BH.80 | Moraskoite | Na2Mg(PO4)F |
| 8.BH.80 | Evseevite | Na2Mg(AsO4)F |
| 8.BH.85 | Piccoliite | NaCaMn3+2(AsO4)2O(OH) |
Fluorescence of Isokite
Fluoresces blue under short wave UV
Other Information
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 Isokite
mindat.org URL:
https://www.mindat.org/min-2054.html
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References for Isokite
Reference List:
forum.amiminerals.it (n.d.) http://forum.amiminerals.it/viewtopic.php?f=5&t=18081&sid=7d8b1ed865c3dde7afc6276b9d04529f
Deans, T., McConnell, J. D. C., Pickup, R. (1955) Isokite, CaMgPO4F, a new mineral from Northern Rhodesia. Mineralogical Magazine and Journal of the Mineralogical Society, 30 (230) 681-690 doi:10.1180/minmag.1955.030.230.01
Yang, Hexiong, Zwick, Justin, Downs, Robert T., Costin, Gelu (2007) Isokite, CaMg(PO4)F0.8(OH)0.2, isomorphous with titanite. Acta Crystallographica Section C Crystal Structure Communications, 63 (10) 189-190 doi:10.1107/s0108270107041169
Localities for Isokite
symbol to view information about a locality.
The Locality List
- 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).
All localities listed without proper references should be considered as questionable.
Australia | |
| Bottrill +1 other reference |
Austria | |
| Strasser (1989) |
| Strasser (1989) | |
| Strasser (1989) |
Brazil | |
| Menezes (n.d.) |
| database and grade and tonnage models: ... +2 other references |
Czech Republic | |
| |
| Sejkora +1 other reference |
Germany | |
| Thomas et al. (2000) |
Norway | |
| Analyzed by PXRD by Alf Olav Larsen |
| RRUFF ID R050519.2 and RRUFF ID: ... +1 other reference | |
| Neumann (1985) |
Portugal | |
| |
| Isaac's et al +8 other references |
| Alves et al. (2012) |
| Leal Gomes et al. (2009) |
| |
| Correia Neves (1962) |
| Rupert Hochleitner and Karl Thomas Fehr et al. (2008) |
Spain | |
| www.foro-minerales.com (n.d.) |
| Gonzalez del Tánago J. (1985) |
USA | |
| NY State Museum spec. no. 19101 |
| Jaffe et al. (1992) |
Zambia (TL) | |
| Deans et al. (1955) |
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Panasqueira Mines, São Jorge da Beira, Covilhã, Castelo Branco, Portugal