Isokite Mineral Data

General Isokite Information

Chemical Formula:

CaMg(PO4)F

Composition:

Molecular Weight = 178.35 gm

Calcium 22.47 % Ca 31.44 % CaO

Magnesium 13.63 % Mg 22.60 % MgO

Phosphorus 17.37 % P 39.79 % P₂O₅

Oxygen 35.88 % O

Fluorine 10.65 % F 10.65 % F

- % F -4.49 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

CaMg(PO₄)F

Environment:

Secondary mineral sometimes found replacing wagnerite.

IMA Status:

Valid Species (Pre-IMA) 1955

Locality:

Nkumbwa Hill, near Isoka, northern Kumbwa, Zamibia. Link to MinDat.org Location Data.

Name Origin:

Named for the locality

Name Pronunciation:

Isokite

Isokite Image

Images:

Isokite

Comments: Pale brownish to brown isokite in quartz.
Location: Sauberg Mine, Ehrenfriedersdorf, Erzgebirge, Saxony, Germany. Scale: Picture size 7 mm.
© Thomas Witzke / Abraxas-Verlag

Isokite Crystallography

Axial Ratios:

a:b:c =0.7457:1:0.7908

Cell Dimensions:

a = 6.5109, b = 8.7301, c = 6.9046, Z = 4; beta = 112.246° V = 363.25 Den(Calc)= 3.26

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/c

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.63(1), 3.02(1), 3.19(1),

Crystal Structure:

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Yang H , Zwick J , Downs R T , Costin G , Acta Crystallographica, Section C , 63 (2007) p.i89-i90, Isokite, CaMg(PO4)F0.8(OH)0.2, isomorphous with titanite, Locality: Kjorrestad, near Bamle, Norway

Physical Properties of Isokite

Cleavage:

{010} Perfect

Color:

Colorless, Gray pink, Pink.

Density:

3.27

Diaphaneity:

Transparent to Translucent

Habit:

Massive - Granular - Common texture observed in granite and other igneous rock.

Hardness:

5 - Apatite

Luminescence:

Fluorescent, Long UV=blue.

Luster:

Silky - Pearly

Streak:

white

Optical Properties of Isokite

Gladstone-Dale:

CI meas= 0.031 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.028 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1838,KPDmeas= 0.1833,KC= 0.1891
Ncalc = 1.62

Optical Data:

Biaxial (+), a=1.59, b=1.594, g=1.614, bire=0.0240

Pleochroism (x):

colorless.

Pleochroism (y):

colorless.

Pleochroism (z):

colorless.

Calculated Properties of Isokite

Electron Density:

Bulk Density (Electron Density)=3.22 gm/cc
note: Specific Gravity of Isokite =3.26 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Isokite= 3.97 barns/electron
U=PE_Isokite x rElectron Density= 12.76 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Isokite is Not Radioactive

Isokite Classification

Dana Class:

41.05.06.02 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen

(41.05)where (A B)2 (XO4) Zq

(41.05.06)Tilasite Group

41.05.06.01 Tilasite CaMg(AsO4)F C 2/c 2/m

41.05.06.02 Isokite CaMg(PO4)F C 2/c 2/m

41.05.06.03 Panasqueiraite CaMg(PO4)(OH,F) C 2/c 2/m

Strunz Class:

08.BH.10 08 - PHOSPHATES, ARSENATES, VANADATES

08.B - Phosphates, etc. with Additional Anions, without H2O

08.BH -With medium-sized and large cations, (OH,etc.):RO4 = 1:1

08.BH.10 Durangite NaAl(AsO4)F C 2/c 2/m

08.BH.10 Isokite CaMg(PO4)F C 2/c 2/m

08.BH.10 Lacroixite NaAl(PO4)F C 2/c 2/m

08.BH.10 Maxwellite NaFe(AsO4)F Aa,A2/a Mono

08.BH.10 Panasqueiraite CaMg(PO4)(OH,F) C 2/c 2/m

08.BH.10 Tilasite CaMg(AsO4)F C 2/c 2/m

Other Isokite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Isokite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Ask about Isokite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Isokite Specimen Label here :

Isokite

CaMg(PO4)F
Dana No: 41.05.06.02 Strunz No: 08.BH.10
Locality:

Notes: