Isokite Mineral Data + 
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- 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
- 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
General Isokite Information |
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 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 | |||
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Images:
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Isokite Crystallography |
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| 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 | ||
| X Ray Diffraction: |
By Intensity(I/Io): 2.63(1), 3.02(1), 3.19(1), | ||
Physical Properties of Isokite |
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| 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 |
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| 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 |
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| 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 |
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| Electron Density: |
relectron=3.20 gm/cc |
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| Fermion Index |
Fermion Index = 0.0141 Boson Index = 0.9859 |
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| Photoelectric: |
PEIsokite = 3.97 barns/electron |
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Isokite is Not Radioactive |
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Isokite Classification |
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| 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 | |||
| 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 | |||
Other Isokite Information |
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| 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 - Crocoite.com Mineral Locations 4 - EUROmin Project 5 -Google Images 6 -Google Scholar 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 -École des Mines de Paris Search for Isokite using: Visit our Advertisers for Isokite : Translate Isokite Mineral Data : Ask about Isokite here : Print or Cut-and-Paste your Isokite Specimen Label here :
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