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Chromphyllite

Pictures (1 Images total)

Chromphyllit
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1584641382
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Chromphyllit
grüne Kristalle mit Spaltflächen von Chromphyllit, Sljudjanka, Baikalsee, Irkutsk, Russland; BB < 1 mm
Copyright: MinTreasure.com (Carsten Slotta); Contribution: openpit
Location: Russland/Sibirien, Föderationskreis/Irkutsk (Irkutskaja), Oblast/Baikalsee/Sljudjanka (Sludyanka; Slyudyanka)
Mineral: Chromphyllite
Image: 1584641382
License: Usage for Mineralienatlas project only
Chromphyllit

grüne Kristalle mit Spaltflächen von Chromphyllit, Sljudjanka, Baikalsee, Irkutsk, Russland; BB < 1 mm
Copyright: MinTreasure.com (Carsten Slotta)
Contribution: openpit 2020-03-19
Locality: Sljudjanka (Sludyanka; Slyudyanka) / Baikalsee / Irkutsk (Irkutskaja), Oblast / Sibirien, Föderationskreis / Russland

Collectors Summary

Color smaragdgrün
Streak color weißlich grün
Hardness (Mohs) 3.5
Cleavages vollkommen {001}
Solubility - HCl, HNO3
Crystal System monoklin, C2/c

Chemism

Chemical formula

K(Cr,Al)2[(OH,F)2|AlSi3O10]

Chemical composition

Aluminium, Chrom, Silicium, Fluor, Kalium, Sauerstoff, Wasserstoff

Unit weight: 436.826014425 u; Number of atoms in the formula: 20.5

Info

Empirical formula:

K(Cr0.75Al0.25)2[((OH)0.75F0.25)2AlSi3O10]

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

0.35

1.5

7.32

1.0079470

1.5119205
Oxygen

O

42.12

11.5

56.10

15.9994300

183.9934450
Fluorine

F

2.17

0.5

2.44

18.9984033

9.4992016
Aluminium

Al

9.27

1.5

7.32

26.9815382

40.4723073
Silicon

Si

19.29

3

14.63

28.0855300

84.2565900
Potassium

K

8.95

1

4.88

39.0983100

39.0983100
Chromium

Cr

17.85

1.5

7.32

51.9961600

77.9942400

Analysis wt%

Ø SiO2 : 40.24, Al2O3 : 14.11, Cr2O3 : 23.99, V2O3 : 2.08, MgO : 1.60, BaO : 4.83, K2O : 8.54, H2O : 3.32, F : 1.28 (Ref: Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva, 1904-1974 97)

Strunz 9th edition incl. updates

9.EC.15

9: Silikate (Germanate)
E: Schichtsilikate (Phyllosilikate)
C: Schichtsilikate (Phyllosilikate) mit Glimmer Tafeln, zusammengesetzt aus tetrahedralen oder octahedralen Netzen
15:Muskovit-Gruppe

Lapis Classification

VIII/H.10-080

VIII: SILIKATE
H: Schichtsilikate
10: Glimmerartige Schicht-silikate mit Baugruppen [Si4O10] 4- und verwandte Strukturen; Glimmer-Gruppe; Seladonit/Muskovit-Reihe (Phengite)

Classification by Hölzel

9.EC.242

9: SILICATES
E: Phyllosilicates
C: Micas-Group

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

 Mica group  ⇒ True micas

Optical Properties

Color

smaragdgrün

Streak color

weißlich grün

Diaphaneity (Transparency)

transparent

max. Birefringence

0.054
Birefringence chart\! Chromphyllite title=Birefringence chart Chromphyllite

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

1.619

RI value β

1.669

RI value γ / ε

1.673

Ri mean

1.654

2V angle

Biaxial (-) 31°

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

15

Space Group

C2/c

Cell parameters a (Å)

5.32

Cell parameters b (Å)

9.07

Cell parameters c (Å)

20.50

Cell parameters a/b or c/a

0.587

Cell parameters c/b

2.260

Cell parameters α

90°

Cell parameters β

95.60

Cell parameters γ

90°

Z

4

Volume (ų)

984.453

X-Ray Powder Diffraction

9.94(60),
4.52(80),
2.86(50),
2.60(100),
2.40(60),
2.15(60),
1.648(50),
1.519(100)
XRD chart Chromphyllite

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)

3.5

VHN (Hardness Vickers)

129 (25g)

Density (g/cm³)

2.88

2.947 ( ρ calc. Mineralienatlas )

Cleavages

vollkommen {001}

Tenacity

schneidbar

Instability

- HCl, HNO3

(Co-)Type locality

(Co-)Type locality

Russland/Sibirien, Föderationskreis/Irkutsk (Irkutskaja), Oblast/Baikalsee/Sljudjanka (Sludyanka; Slyudyanka)/Pokhabikha-Tal/Pereval Marmorsteinbruch (Grube Kaber)

Preface

Author (Name, Year)

Reznitskiy & Sklyarov & Ushchapovskaya & Nartova & Evsyunin & Kashaev

References

Zapiski Vserossiskogo Mineralogicheskogo Obshchetstva 126 (1997) (2), 110

IMA group assignments

Other languages

German

Chromphyllit

French

Chromphyllite

English

Chromphyllite

Spanish

Cromfilita

Russian

Хромфиллит

Alternative Name

Spanish

Chromphyllita

CNMNC (IMA)-Number

IMA 1995-052

CNMNC symbol

Symbol

Crp

Locations with GPS information

IDs

GUSID (Global unique identifier short form) -hhyN_rr4kCX5s-NPh0oJQ
GUID (Global unique identifier) 377218FA-EBFA-40E2-97E6-CF8D3E1D2825
Database ID 748