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Kolfanite

Pictures (2 Images total)

Kolfanit pseudomorph nach Löllingit
Views (File:
1581354664
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Kolfanit pseudomorph nach Löllingit
bräunlicher Kolfanit pseudomorph nach Löllingit, Vasin-Myl'k Mountain, Voron'i Tundry, Kola, Russland; BB < 1 mm
Copyright: MinTreasure.com (Carsten Slotta); Contribution: openpit
Location: Russland/Nordwestrussland, Föderationskreis/Murmansk, Oblast/Kola-Halbinsel/Voron'i Tundry/Vasin-Myl'k, Berg
Mineral: Kolfanite
Image: 1581354664
License: Usage for Mineralienatlas project only
Kolfanit pseudomorph nach Löllingit

bräunlicher Kolfanit pseudomorph nach Löllingit, Vasin-Myl'k Mountain, Voron'i Tundry, Kola, Russland; BB < 1 mm

Copyright: MinTreasure.com (Carsten Slotta)
Contribution: openpit 2020-02-10
Locality: Vasin-Myl'k, Berg / Voron'i Tundry / Kola-Halbinsel / Murmansk, Oblast / Nordwestrussland, Föderationskreis / Russland
Kolfanit, Mitridatit
Views (File:
1644179826
): 107
Kolfanit, Mitridatit
orangegelber Kolfanit mir schwarz-glänzendem Mitridatit; Bildbreite: 2 mm; Fundort: Vasin-Myl'k, Voron'i Tundry, Kola-Halbinsel, Murmansk, Nordwestrussland, Föderationskreis, RU
Copyright: proetho; Contribution: slugslayer
Location: Russland/Nordwestrussland, Föderationskreis/Murmansk, Oblast/Kola-Halbinsel/Voron'i Tundry/Vasin-Myl'k, Berg
Mineral: Kolfanite, Mitridatite
Image: 1644179826
License: Usage for Mineralienatlas project only
Kolfanit, Mitridatit

orangegelber Kolfanit mir schwarz-glänzendem Mitridatit; Bildbreite: 2 mm; Fundort: Vasin-Myl'k, Voron'i Tundry, Kola-Halbinsel, Murmansk, Nordwestrussland, Föderationskreis, RU

Copyright: proetho
Contribution: slugslayer 2022-02-06
Locality: Vasin-Myl'k, Berg / Voron'i Tundry / Kola-Halbinsel / Murmansk, Oblast / Nordwestrussland, Föderationskreis / Russland

Collectors Summary

Color gelb, orange, rot
Streak color orange
Hardness (Mohs) 2.5
Solubility +++ Säuren
Crystal System monoklin,

Chemism

Chemical formula

Ca2Fe33+O2(AsO4)3·2H2O

Chemical composition

Arsen, Calcium, Eisen, Sauerstoff, Wasserstoff

Unit weight: 732.479874 u; Number of atoms in the formula: 28

Info

Empirical formula:

Ca2Fe3O2(AsO4)3·2H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

0.55

4

14.29

1.0079470

4.0317880

Oxygen

O

34.95

16

57.14

15.9994300

255.9908800

Calcium

Ca

10.94

2

7.14

40.0784000

80.1568000

Iron

Fe

22.87

3

10.71

55.8452000

167.5356000

Arsenic

As

30.69

3

10.71

74.9216020

224.7648060

Analysis wt%

As2O5 : 43.30, P2O5 : 0.96, Sb2O5 : 2.20, CaO : 14.97, Fe2O3 : 32.09, SiO2 : 1.20, H2O : 5.10 (Ref: Mineralogicheskii Zhurnal 82)

Strunz 9th edition incl. updates

8.DH.30

8: Phosphate, Arsenate, Vanadate
D: Phosphate, mit weiteren Anionen, mit H2O
H: Mit großen und mittelgroßen [Kationen], (OH, etc.):RO4 < 1:1
30:Mitridatit-Gruppe

Lapis Classification

VII/D.30-020

VII: PHOSPHATE, ARSENATE UND VANADATE ("Phosphate" des Registers immer einschließlich isotyper Arsenate und Vanadate!)
D: Wasserhaltige Phosphate, mit fremden Anionen
30: Mittelgroße und sehr große Kationen: Al-Mg und Ca-Na-K

Classification by Hölzel

8.DO.400

8: PHOSPHATES ARSENATES VANADATES
D: Phosphates (+Anions +Water)
O: Mitridatite-Group

Dana 8th edition

42.08.05.01

42: Hydrated Phosphates, etc., Containing Hydroxyl or Halogen
08: Hydrated Phosphates, etc., Containing Hydroxyl or Halogen where (AB)7 (XO4)4 Zq · x(H2O)
05: Kolfanite Group

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

Optical Properties

Color

gelb, orange, rot

Streak color

orange

max. Birefringence

0.123

Birefringence chart\! Kolfanite title=Birefringence chart Kolfanite

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

1.810

RI value β

1.923

RI value γ / ε

1.933

Ri mean

1.889

2V angle

Biaxial (-) 6°

Crystallography

Crystal System

monoklin

Cell parameters a (Å)

17.86

Cell parameters b (Å)

19.66

Cell parameters c (Å)

11.11

Cell parameters a/b or c/a

0.908

Cell parameters c/b

0.565

Cell parameters α

90°

Cell parameters β

96.0

Cell parameters γ

90°

Z

12

Volume (ų)

3879.657

X-Ray Powder Diffraction

8.90(100),
5.64(50),
3.29(90),
2.95(90),
2.720(100),
2.216(80),
1.646(80),
1.503(50)

XRD chart Kolfanite

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

Physical Properties

Hardness (Mohs)

2.5

VHN (Hardness Vickers)

64 (20g)

Density (g/cm³)

3.3

3.762 ( ρ calc. Mineralienatlas )

Instability

+++ Säuren

Preface

Author (Name, Year)

Voloshin & Men'shikov & Polezhaeva & Lentsi, 1982

References

Mineralogicheskiy Zhurnal 4 (1982) (2), 90

Other languages

German

Kolfanit

Spanish

Kolfanita

French

Kolfanite

English

Kolfanite

Russian

Колфанит

Traditional Chinese

柯砷鈣鐵石

Simplified Chinese

柯砷钙铁石

CNMNC (IMA)-Number

IMA 1981-017

CNMNC symbol

Symbol

Kfn

Locations with GPS information

IDs

GUSID (Global unique identifier short form) L__Qq_OWcUuP7JCjTsUy_Q
GUID (Global unique identifier) ABD0FF2F-96F3-4B71-8FEC-90A34EC532FD
Database ID 2018