Isokite Mineral Data

Isokite Mineral Data +

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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

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 =0.7451:1:0.8582

Cell Dimensions:

a = 6.52, b = 8.75, c = 7.51, Z = 4; beta = 121.467° V = 365.44 Den(Calc)= 3.24

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),

Physical Properties of Isokite

Cleavage:

[010] Perfect

Color:

Colorless, Gray pink, Pink.

Density:

3.27

Diaphaniety:

Transparent to Translucent

Hardness:

5 - Apatite

Luminescence:

Fluorescent.

Luster:

Silky - Pearly

Streak:

white

Optical Properties of Isokite

Gladstone-Dale:

CI meas= 0.031 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.022 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.185,KPDmeas= 0.1833,KC= 0.1891

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:

r_electron=3.20 gm/cc
note: r_Isokite=3.24 gm/cc.

Fermion Index

Fermion Index = 0.0141
Boson Index = 0.9859

Photoelectric:

PE_Isokite= 3.97 barns/electron
U=PE_Isokite x r_electron= 12.68 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Isokite is Not Radioactive

Isokite Classification

Dana Class:

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

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

(41.5.6)Tilasite Group

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

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

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

Strunz Class:

VII/B.25-10 VII - Phosphates, Arsenates and Vanadates

VII/B - Waterfree phosphates with unfamiliar anions F, Cl, O, OH. cations of medium and big size: Mg, Cu, Zn, and Ca, Na, K, Ba, Pb

VII/B.25 - Isokite - Thadeuite series

VII/B.25-10 Isokite CaMg(PO4)F C 2/c 2/m

VII/B.25-20 Panasqueiraite CaMg(PO4)(OH,F) C 2/c 2/m

VII/B.25-30 Tilasite CaMg(AsO4)F C 2/c 2/m

VII/B.25-40 Lacroixite NaAl(PO4)F C 2/c 2/m

VII/B.25-50 Durangite NaAl(AsO4)F C 2/c 2/m

VII/B.25-55 Maxwellite NaFe(AsO4)F Aa,A2/a Mono

VII/B.25-60 Nacaphite Na(Na,Ca)2(PO4)F P1 1

VII/B.25-70 Spodiosite? Ca2(PO4)F Pbcm 2/m 2/m 2/m

VII/B.25-80 Thadeuite (Ca,Mn)(Mg,Fe,Mn)3(PO4)2(OH,F)2 C 222₁ 2 2 2

Other Isokite Information

References:

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

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

Isokite

CaMg(PO4)F
Dana No: 41.5.6.2 Strunz No: VII/B.25-10
Locality:

Notes: