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Isokite (Isokit)

Pictures (2 Images total)

Isokit
Views (File:
1271518293
): 1532
Isokit
rosa, derbe Aggregate; Grube Sauberg, Ehrenfriedersdorf, Erzgebirge, Sachsen, Deutschland; Bildbreite 2 cm
Copyright: uwe; Contribution: uwe
Collection: uwe
Location: Deutschland/Sachsen/Erzgebirgskreis/Ehrenfriedersdorf/Grube Sauberg
Mineral: Isokite
Image: 1271518293
License: Usage for Mineralienatlas project only
Isokit

rosa, derbe Aggregate; Grube Sauberg, Ehrenfriedersdorf, Erzgebirge, Sachsen, Deutschland; Bildbreite 2 cm
Collection: uwe
Copyright: uwe
Contribution: uwe 2010-04-17
Locality: Grube Sauberg / Ehrenfriedersdorf / Erzgebirgskreis / Sachsen / Deutschland
Isokit
Views (File:
1597068634
): 343
Isokit
Portugal/Guarda, Distrikt, Gouveia, Folgosinho. Bildbreite 1,3 mm
Copyright: Ulrich Baumgärtl; Contribution: Ulrich Baumgärtl
Collection: Ulrich Baumgärtl
Location: Portugal/Guarda, Distrikt/Gouveia/Folgosinho/Steinbruch Folgosinho (Sítio do Castelo Mine)
Mineral: Isokite
Image: 1597068634
License: Usage for Mineralienatlas project only
Isokit

Portugal/Guarda, Distrikt, Gouveia, Folgosinho. Bildbreite 1,3 mm
Collection: Ulrich Baumgärtl
Copyright: Ulrich Baumgärtl
Contribution: Ulrich Baumgärtl 2020-08-10
Locality: Steinbruch Folgosinho (Sítio do Castelo Mine) / Folgosinho / Gouveia / Guarda, Distrikt / Portugal

You find additional Isokit specimen at the Geolitho Museum

Collectors Summary

Hardness (Mohs) 5
Solubility +++ Säuren
Crystal System monoklin, A2/a

Chemism

Chemical formula

CaMg(PO4)F

Chemical composition

Calcium, Magnesium, Fluor, Phosphor, Sauerstoff

Unit weight: 178.35334445 u; Number of atoms in the formula: 8

Info

Empirical formula:

CaMg(PO4)F

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Oxygen

O

35.88

4

50.00

15.9994300

63.9977200
Fluorine

F

10.65

1

12.50

18.9984033

18.9984033
Magnesium

Mg

13.63

1

12.50

24.3050600

24.3050600
Phosphorus

P

17.37

1

12.50

30.9737612

30.9737612
Calcium

Ca

22.47

1

12.50

40.0784000

40.0784000

Analysis wt%

CaO : 30.72, SrO : 1.65, MgO : 21.58, FeO : 0.49, P2O5 : 37.76, F : 9.55, H2O : 0.72, CO2 : 1.02 (Ref: Mineralogical Magazine 55)

Strunz 9th edition incl. updates

8.BH.10

8: Phosphate, Arsenate, Vanadate
B: Phosphate, etc., mit weitere Anionen, ohne H2O
H: Mit mittelgroßen und meist großen [Kationen] (OH, etc.):RO4 = 1:1
10:Tilasit-Gruppe

Lapis Classification

VII/B.25-010

VII: PHOSPHATE, ARSENATE UND VANADATE ("Phosphate" des Registers immer einschließlich isotyper Arsenate und Vanadate!)
B: Wasserfreie Phosphate, mit fremden Anionen F,Cl,O,OH
25: Mittelgroße und große Kationen: Mg-Cu-Zn und Ca-Na-K-Ba-Pb

Classification by Hölzel

8.BL.110

8: PHOSPHATES ARSENATES VANADATES
B: Phosphates (+Anions -Water)
L: Phosphates, very large: 2, Vmed: 2
1: Monoclinic Panasqueraite-Group

Dana 8th edition

41.05.06.02

41: Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen
05: Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen where (A B)2 (XO4) Zq
06: Tilasite Group

IMA status

Erstbeschreibung vor CNMNC-Gründung (1959), als Mineral meist anerkannt

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

 Tilasite-Durangite group

Optical Properties

max. Birefringence

0.024
Birefringence chart\! Isokite title=Birefringence chart Isokite

Michel-Levy Color Chart viewed according to the maximum birefringence (at 30μm). Mineral color is not taken into account. Click on the image to enlarge or change thickness.

RI value α / ω / n

1.590

RI value β

1.594

RI value γ / ε

1.614

Ri mean

1.599

2V angle

Biaxial (+) 51°

Optical Data Luminescence

Color LW-UV (365nm)

  

blau

Color SW-UV (254nm)

  

blau

Afterglow (Persistant Luminescence)

keine Daten

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

15

Space Group

A2/a

Cell parameters a (Å)

6.511

Cell parameters b (Å)

8.730

Cell parameters c (Å)

6.905

Cell parameters a/b or c/a

0.746

Cell parameters c/b

0.791

Cell parameters α

90°

Cell parameters β

112.25

Cell parameters γ

90°

Z

4

Volumne (ų)

363.263

X-Ray Powder Diffraction

3.185(100),
3.023(100),
2.784(50),
2.630(100),
2.586(50),
2.301(80),
2.105(50),
1.720(80)
XRD chart Isokite

Calculated from d-spacing and intensity at 0.1541838 nm (Cu)

Crystals 3D

Open larger view

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

5

VHN (Hardness Vickers)

390 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

3.27 (berechnet)

3.261 ( ρ calc. Mineralienatlas )

Instability

+++ Säuren

(Co-)Type locality

(Co-)Type locality

Sambia/Nordprovinz/Isoka, Distrikt/Nkumbwa Hill

Preface

Author (Name, Year)

Deans & McConnell, 1955

References

Handbook of Mineralogy (Anthony et al.), 4 (2000), 258

IMA group assignments

Other languages

German

Isokit

Spanish

Isokita

French

Isokite

English

Isokite

Russian

Исокит

CNMNC symbol

Symbol

Iso

Locations with GPS information