Isokite (original) (raw)

A valid IMA mineral species - grandfathered

About IsokiteHide

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Colour:

white, buff, pale pink

Specific Gravity:

3.15 - 3.27

Crystal System:

Monoclinic

Name:

Named for the community of Isoka, Zambia, about 24 kilometers west of the type locality.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:2054:7

9da77eaa-eab0-4ea1-8018-ca9aa5140e23

IMA Classification of IsokiteHide

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

Type description reference:

Classification of IsokiteHide

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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

Mineral SymbolsHide

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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Physical Properties of IsokiteHide

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Colour:

White, buff, pale pink

Density:

3.15 - 3.27 g/cm3 (Measured) 3.29 g/cm3 (Calculated)

Optical Data of IsokiteHide

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RI values:

_n_α = 1.590 _n_β = 1.595 _n_γ = 1.615

δ = 0.025

Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.

Dispersion:

r > v distinct

Chemistry of IsokiteHide

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Mindat Formula:

CaMg(PO4)F

Crystallography of IsokiteHide

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Crystal System:

Monoclinic

Class (H-M):

2/m - Prismatic

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)

Morphology:

Crystals are flattened on {010}, elongated along {100}.

Crystal StructureHide

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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 DiffractionHide

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Powder Diffraction Data:

Comments:

Nkombwa Hill, Zambia

Geological EnvironmentHide

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Type Occurrence of IsokiteHide

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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:

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

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Relationship of Isokite to other SpeciesHide

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Other Members of this group:

Common AssociatesHide

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Associated Minerals Based on Photo Data:

Related Minerals - Strunz-mindat GroupingHide

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Fluorescence of IsokiteHide

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Fluoresces blue under short wave UV

Other InformationHide

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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 IsokiteHide

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References for IsokiteHide

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Reference List:

Ercit, T.S., Piilonen, P.C., Locock, A.J., Kolitsch, U., Rowe, R. (2006) New mineral names. American Mineralogist, 91, 1201-1209.

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

Koshlyakova, N.N., Pekov, I.V., Zubkova, N.V., Agakhanov, A.A., Turchkova, A.G., Kartashov, P.M., Sidorov, E.G., Pushcharovsky, D.Yu. (2020): A new solid solution with the garnet structure: the berzeliite–schaferite isomorphous series from Fumarole exhalations of the Tolbachik volcano, Kamchatka. Zapiski RMO (Proceedings of the Russian Mineralogical Society): 149(1): 69-84.

Localities for IsokiteHide

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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

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- 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). 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.

Australia
Tasmania Waratah-Wynyard municipality Waratah district Waratah ⓘ Mount Bischoff Mine	Bottrill +1 other reference
Austria
Salzburg St. Johann im Pongau District Pfarrwerfen ⓘ Rettenbachgraben (Schlaminggraben)	Strasser (1989)
ⓘ Wengergraben	Strasser (1989)
Werfen ⓘ Höllgraben	Strasser (1989)
Brazil
Bahia ⓘ Brumado	Menezes (n.d.)
Minas Gerais Araxá ⓘ Barreiro	database and grade and tonnage models: ... +2 other references
Czech Republic
Karlovy Vary Region Sokolov District ⓘ Horní Slavkov
Krásno ⓘ Huber stock (Huber shaft; Hub stock)	Sejkora et al. (2006) +1 other reference
Germany
Saxony Erzgebirgskreis Ehrenfriedersdorf ⓘ Sauberg Mine	Thomas et al. (2000)
Norway
Telemark Bamble Havredal Midtre Havredal ⓘ Wagnerite Prospect	Analyzed by PXRD by Alf Olav Larsen
ⓘ Kjørstad	RRUFF ID R050519.2 and RRUFF ID: ... +1 other reference
Nome ⓘ Fen Iron Mines	Neumann (1985)
Portugal
Castelo Branco Covilhã Aldeia de São Francisco de Assis ⓘ Barroca Grande Mine
Guarda Gouveia Folgosinho ⓘ Sítio do Castelo Mine	Alves et al. (2012)
ⓘ Panasqueira Mines	Isaac's et al +8 other references
Viana do Castelo Ponte da Barca Touvedo (São Lourenço e Salvador) ⓘ Pedra da Moura Mine	Leal Gomes et al. (2009)
Viseu Mangualde Mangualde (Mesquitela e Cunha Alta) ⓘ Cubos-Mesquitela-Mangualde area
Penalva do Castelo Sezures ⓘ Venturinha	Correia Neves (1962)
Sátão Ferreira de Aves Aldeia Nova ⓘ Assunção Mine	Rupert Hochleitner and Karl Thomas Fehr et al. (2008)
Spain
Castile and Leon Salamanca Navasfrías ⓘ Salmantina Mine	www.foro-minerales.com (n.d.)
Community of Madrid Soto del Real San Pedro Massif Rancajales ⓘ Unnamed pegmatite	Gonzalez del Tánago J. (1985)
USA
New York St. Lawrence County Clifton ⓘ Star Lake	NY State Museum spec. no. 19101
Benson ⓘ Benson Mines	Jaffe et al. (1992)
Zambia (TL)
Muchinga Province Isoka District Isoka ⓘ Nkumbwa Hill Carbonatite (Nkombwa Hill Carbonatite) (TL)	Deans et al. (1955)