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Khristovite-(Ce)

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Khristovit-(Ce)
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Khristovit-(Ce)
bräunliche, transparente Tafeln von Khristovit-(Ce) in Rhodonit, Muzeinyi-Tal, Inyl'chek Gebirgskette, Issyk-Kul'skaya Oblast, Kirgisistan; BB < 1 mm
Copyright: Joy Desor; Contribution: openpit
Location: Kirgistan/Issyk-Kulskaya Oblast/Inyl'chek/Muzeinyi Sai
Mineral: Khristovite-(Ce)
Image: 1588258491
License: Usage for Mineralienatlas project only
Khristovit-(Ce)

bräunliche, transparente Tafeln von Khristovit-(Ce) in Rhodonit, Muzeinyi-Tal, Inyl'chek Gebirgskette, Issyk-Kul'skaya Oblast, Kirgisistan; BB < 1 mm

Copyright: Joy Desor
Contribution: openpit 2020-04-30
Locality: Muzeinyi Sai / Inyl'chek / Issyk-Kulskaya Oblast / Kirgistan

Collectors Summary

Color graubraun
Streak color bräunlichgrau
Hardness (Mohs) 5
Cleavages keine
Fracture muschelig
Crystal System monoklin, P21/m

Chemism

Chemical formula

(Ca,Ce)(Ce,La,Nd,Dy)Mn2+2Al[(OH,F,O)2|SiO4|Si2O7]

Chemical composition

Aluminium, Calcium, Cerium, Dysprosium, Lanthanum, Mangan, Neodymium, Silicium, Fluor, Sauerstoff, Wasserstoff

Unit weight: 638.48837935 u; Number of atoms in the formula: 22.2

Info

Empirical formula:

(Ca0.75Ce0.25)(Ce0.55La0.3Nd0.1Dy0.05)Mn2Al[((OH)0.6F0.3O0.1)2SiO4Si2O7]

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

0.19

1.2

5.41

1.0079470

1.2095364

Oxygen

O

31.07

12.4

55.86

15.9994300

198.3929320

Fluorine

F

1.79

0.6

2.70

18.9984033

11.3990420

Aluminium

Al

4.23

1

4.50

26.9815382

26.9815382

Silicon

Si

13.20

3

13.51

28.0855300

84.2565900

Calcium

Ca

4.71

0.75

3.38

40.0784000

30.0588000

Manganese

Mn

17.21

2

9.01

54.9380499

109.8760998

Lanthanum

La

6.53

0.3

1.35

138.9055200

41.6716560

Cerium

Ce

17.56

0.8

3.60

140.1161000

112.0928800

Neodymium

Nd

2.26

0.1

0.45

144.2430000

14.4243000

Dysprosium

Dy

1.27

0.05

0.23

162.5001000

8.1250050

Analysis wt%

SiO2 : 33.00, MgO : 2.50, Al2O3 : 11.00, CaO : 5.60, TiO2 : 1.75, FeO : 3.00, MnO : 14.50, La2O3 : 8.70, Ce2O3 : 11.00, Nd2O3 : 2.50, Dy2O3 : 1.25, Pr2O3 : 0.75, V2O3 : 1.10, Cr2O3 : 1.70, F : 1.30, Ln2O3 : 24.45 (Ref: Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva, 1904-1974 93)

Strunz 9th edition incl. updates

9.BG.05

9: Silikate (Germanate)
B: Gruppensilikate (Sorosilikate)
G: Gruppen(Soro)-Silikate mit gemischten SiO4 und Si2O7 Gruppen; Kationen in oktahedraler [6] und größerer Koordination
05:Epidot-Gruppe

Lapis Classification

VIII/C.23-085

VIII: SILIKATE
C: Gruppensilikate
23: Mischstrukturen mit [SiO4] 4--Inseln und [Si2O7] 6--Gruppen; Epidot-Gruppe

Classification by Hölzel

9.BN.320

9: SILICATES
B: Sorosilicates
N: With SiO4 + Si2O7
3: Dollasite-Group

Dana 8th edition

58.02.01a.09

58: Sorosilicates Sorosilicate Insular, Mixed, Single, and Larger Tetrahedral Groups
02: Sorosilicates Sorosilicate Insular, Mixed, Single, and Larger Tetrahedral Groups with cations in [6] and higher coordination; single and double groups (n=1,2)
01a: Epidote group (Clinozoisite subgroup)

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

Epidote supergroup  ⇒ Dollaseite group

Optical Properties

Color

graubraun

Streak color

bräunlichgrau

max. Birefringence

0.030

Birefringence chart\! Khristovite-(Ce) title=Birefringence chart Khristovite-(Ce)

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

1.773

RI value β

1.790

RI value γ / ε

1.803

Ri mean

1.789

2V angle

Biaxial (-) 83°

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

11

Space Group

P21/m

Cell parameters a (Å)

8.903

Cell parameters b (Å)

5.748

Cell parameters c (Å)

10.107

Cell parameters a/b or c/a

1.549

Cell parameters c/b

1.758

Cell parameters α

90°

Cell parameters β

113.42

Cell parameters γ

90°

Z

2

Volumne (ų)

474.609

X-Ray Powder Diffraction

9.32(20),
5.23(20),
4.67(20),
3.83(10),
3.52(40),
2.91(100),
2.73(70),
2.63(80)

XRD chart Khristovite-(Ce)

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

Crystals 3D

Open larger view

Physical Properties

Hardness (Mohs)

5

VHN (Hardness Vickers)

390 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

4.05 (gemessen)

4.468 ( ρ calc. Mineralienatlas )

Cleavages

keine

Fracture

muschelig

Tenacity

spröde

(Co-)Type locality

(Co-)Type locality

Kirgistan/Issyk-Kulskaya Oblast/Inyl'chek/Muzeinyi Sai

Preface

Author (Name, Year)

Pautov & Khvorov & Ignatenko & Sokolova & Nadezhina, 1993

References

Zapiski Vserossiskogo Mineralogicheskogo Obshchetstva 122 (1993) (3), 103

IMA group assignments

Other languages

German

Khristovit-(Ce)

Spanish

Khristovita-(Ce)

French

Khristovite-(Ce)

English

Khristovite-(Ce)

Russian

Христовит-(Ce)

Russian

Христовит-(Се)

CNMNC (IMA)-Number

IMA 1991-055

CNMNC symbol

Symbol

Kh-Ce

Locations with GPS information