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Gatelite-(Ce)

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Gatelit-(Ce)
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Gatelit-(Ce)
Bildbreite: 2 mm, Fundort: Trimouns Talc Mine, Luzenac, Ariège, Frankreich
Copyright: Luigi Chiappino; Contribution: thdun5
Location: Frankreich/Okzitanien (Occitanie), Region/Ariège, Département/Foix, Arrondissement/Luzenac/Trimouns Talksteinbruch
Mineral: Gatelite-(Ce)
Image: 1275144312
Rating: 6 (votes: 2)
License: Usage for Mineralienatlas project only
Gatelit-(Ce)

Bildbreite: 2 mm, Fundort: Trimouns Talc Mine, Luzenac, Ariège, Frankreich

Copyright: Luigi Chiappino
Contribution: thdun5 2010-05-29
Locality: Trimouns Talksteinbruch / Luzenac / Foix, Arrondissement / Ariège, Département / Okzitanien (Occitanie), Region / Frankreich

Collectors Summary

Color farblos
Streak color weiß
Lustre Glasglanz
Hardness (Mohs) 6.5
Cleavages gut {100} und unvollkommen {001}
Fracture unregelmäßig
Solubility - HCl
Crystal System monoklin, P21/a
Morphology gestreift nach {010}

Chemism

Chemical formula

(Ca,Ce)4(Al,Mg,Fe)4(Si2O7)(SiO4)3(O,F,OH)3

Empirical formula (analysis)

Ca1.1Ce1.4La0.5Nd0.8Pr0.1Sm0.1Al3.1Mg0.5Fe2+0.3Si5.1O20.3(OH)1.6F0.3

Chemical composition

Aluminium, Calcium, Cerium, Eisen, Magnesium, Silicium, Fluor, Sauerstoff, Wasserstoff

Unit weight: 1067.707819795 u; Number of atoms in the formula: 36.8

Info

Empirical formula:

Ca1.1Ce1.4La0.5Nd0.8Pr0.1Sm0.1Al3.1Mg0.5Fe0.3Si5.1O20.3(OH)1.6F0.3

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

0.15

1.6

4.35

1.0079470

1.6127152

Oxygen

O

32.82

21.9

59.51

15.9994300

350.3875170

Fluorine

F

0.53

0.3

0.82

18.9984033

5.6995210

Magnesium

Mg

1.14

0.5

1.36

24.3050600

12.1525300

Aluminium

Al

7.83

3.1

8.42

26.9815382

83.6427684

Silicon

Si

13.42

5.1

13.86

28.0855300

143.2362030

Calcium

Ca

4.13

1.1

2.99

40.0784000

44.0862400

Iron

Fe

1.57

0.3

0.82

55.8452000

16.7535600

Lanthanum

La

6.50

0.5

1.36

138.9055200

69.4527600

Cerium

Ce

18.37

1.4

3.80

140.1161000

196.1625400

Praseodymium

Pr

1.32

0.1

0.27

140.9076520

14.0907652

Neodymium

Nd

10.81

0.8

2.17

144.2430000

115.3944000

Samarium

Sm

1.41

0.1

0.27

150.3630000

15.0363000

Analysis wt%

Ø SiO2 : 28.11, Al2O3 : 14.44, FeO : 2.13, MgO : 1.91, La2O3 : 8.17, Ce2O3 : 20.58, Pr2O3 : 2.22, Nd2O3 : 11.74, Sm2O3 : 1.78, CaO : 5.66, H2O : 1.34, Ln2O3 : 45.01 (Ref: American Mineralogist 2003)

Strunz 9th edition incl. updates

9.BG.50

9: Silikate (Germanate)
B: Gruppensilikate (Sorosilikate)
G: Gruppen(Soro)-Silikate mit gemischten SiO4 und Si2O7 Gruppen; Kationen in oktahedraler [6] und größerer Koordination
50:

Lapis Classification

VIII/C.23-095

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

Classification by Hölzel

9.BN.850

9: SILICATES
B: Sorosilicates
N: With SiO4 + Si2O7
8: Not classified

Dana 8th edition

58.02.01a.16

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-törnebohmite polysomatic series
Gatelite supergroup  ⇒ Gatelite group

Optical Properties

Color

farblos

Streak color

weiß

Diaphaneity (Transparency)

transparent

Lustre

Glasglanz

RI value α / ω / n

1.807

Ri mean

1.807

2V angle

Biaxial

Optical Data Luminescence

Luminescence

keine Fluoreszenz bekannt

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

14

Space Group

P21/a

Cell parameters a (Å)

17.770

Cell parameters b (Å)

5.651

Cell parameters c (Å)

17.458

Cell parameters a/b or c/a

3.145

Cell parameters c/b

3.089

Cell parameters α

90°

Cell parameters β

116.18

Cell parameters γ

90°

Z

4

Volumne (ų)

1573.256

X-Ray Powder Diffraction

15.67(90),
7.97(30),
4.61(30),
3.49(50),
2.967(100),
2.826(40),
2.740(30),
2.610(60)

XRD chart Gatelite-(Ce)

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

Morphology

gestreift nach {010}

Crystals 3D

Open larger view

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

6.5

VHN (Hardness Vickers)

960 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

4.51

4.508 ( ρ calc. Mineralienatlas )

Cleavages

gut {100} und unvollkommen {001}

Fracture

unregelmäßig

Tenacity

spröde

Instability

- HCl

Chemical Properties and Tests

Gatelit-(Ce) ist unlöslich in Salzsäure

Preface

Associations

Aeschynit-(Y), Dissakisit-(Ce), Dolomit, Pyrit, Quarz, Talk, Törnebohmit-(Ce)

Name from

Pierre Gatel, Gründer Präsident der Association Française de Microminéralogie (AFM)

Author (Name, Year)

Bonazzi & Bindi & Parodi, 2003

References

American Mineralogist 88 (2003), 223

IMA group assignments

Other languages

German

Gatelit-(Ce)

Spanish

Gatelita-(Ce)

English

Gatelite-(Ce)

French

Gatelite-(Ce)

Russian

Гателит-(Ce)

CNMNC (IMA)-Number

IMA 2001-050

CNMNC symbol

Symbol

Gat-Ce

Locations with GPS information