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Dollaseite-(Ce) (Dollaseit-(Ce))

Pictures (2 Images total)

Dollaseit-(Ce)
Views (File:
1276107551
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Dollaseit-(Ce)
Größe: 3 x 2,7 x 1 cm, Fundort: Östanmossa-Grube, Norberg, Västmanland, Schweden
Copyright: Maggie Wilson; Contribution: thdun5
Location: Schweden/Västmanlands, Provinz/Norberg/Östanmossa-Grube (Röberg-Feld)
Mineral: Dollaseite-(Ce)
Image: 1276107551
Rating: 5 (votes: 1)
License: Usage for Mineralienatlas project only
Dollaseit-(Ce)

Größe: 3 x 2,7 x 1 cm, Fundort: Östanmossa-Grube, Norberg, Västmanland, Schweden

Copyright: Maggie Wilson
Contribution: thdun5 2010-06-09
Locality: Östanmossa-Grube (Röberg-Feld) / Norberg / Västmanlands, Provinz / Schweden
Dollaseit-(Ce)
Views (File:
1276107507
): 941
Dollaseit-(Ce)
Bildbreite: 4 mm, Fundort: Östanmossa-Grube, Norberg, Västmanland, Schweden
Copyright: Luigi Chiappino; Contribution: thdun5
Location: Schweden/Västmanlands, Provinz/Norberg/Östanmossa-Grube (Röberg-Feld)
Mineral: Dollaseite-(Ce)
Image: 1276107507
Rating: 3 (votes: 2)
License: Usage for Mineralienatlas project only
Dollaseit-(Ce)

Bildbreite: 4 mm, Fundort: Östanmossa-Grube, Norberg, Västmanland, Schweden

Copyright: Luigi Chiappino
Contribution: thdun5 2010-06-09
Locality: Östanmossa-Grube (Röberg-Feld) / Norberg / Västmanlands, Provinz / Schweden

Collectors Summary

Color braun
Streak color hellbraun
Hardness (Mohs) 5.5
Crystal System monoklin, P21/m

Chemism

Chemical formula

CaCe(Mg2Al)[Si2O7][SiO4]F(OH)

Chemical composition

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

Unit weight: 552.04225845 u; Number of atoms in the formula: 22

Info

Empirical formula:

CaCe(Mg2Al)[Si2O7][SiO4]F(OH)

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

0.18

1

4.55

1.0079470

1.0079470

Oxygen

O

34.78

12

54.55

15.9994300

191.9931600

Fluorine

F

3.44

1

4.55

18.9984033

18.9984033

Magnesium

Mg

8.81

2

9.09

24.3050600

48.6101200

Aluminium

Al

4.89

1

4.55

26.9815382

26.9815382

Silicon

Si

15.26

3

13.64

28.0855300

84.2565900

Calcium

Ca

7.26

1

4.55

40.0784000

40.0784000

Cerium

Ce

25.38

1

4.55

140.1161000

140.1161000

Analysis wt%

SiO2 : 32.40, Al2O3 : 8.90, FeO : 3.30, MgO : 13.10, CaO : 9.20, La2O3 : 6.00, Ce2O3 : 13.20, Pr2O3 : 2.60, Nd2O3 : 6.00, Sm2O3 : 2.40, Gd2O3 : 2.10, F : 3.00, H2O : 2.00, Ln2O3 : 32.30 (Ref: American Mineralogist 88)

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.23-080

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

Classification by Hölzel

9.BN.300

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

Dana 8th edition

58.02.01a.06

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

Neudefinition von der CNMNC anerkannt

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

Epidote supergroup  ⇒ Dollaseite group

Optical Properties

Color

braun

Streak color

hellbraun

Diaphaneity (Transparency)

durchscheinend

max. Birefringence

0.018

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

1.715

RI value β

1.718

RI value γ / ε

1.733

Ri mean

1.722

2V angle

Biaxial (+) 55°

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

11

Space Group

P21/m

Cell parameters a (Å)

8.934

Cell parameters b (Å)

5.721

Cell parameters c (Å)

10.176

Cell parameters a/b or c/a

1.562

Cell parameters c/b

1.779

Cell parameters α

90°

Cell parameters β

114.32

Cell parameters γ

90°

Z

2

Volumne (ų)

473.955

X-Ray Powder Diffraction

9.29(20),
8.25(10),
3.52(20),
3.26(10),
2.915(100),
2.852(30),
2.709(70),
2.150(20)

XRD chart Dollaseite-(Ce)

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

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

5.5

VHN (Hardness Vickers)

530 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

3.9 (gemessen)

3.868 ( ρ calc. Mineralienatlas )

(Co-)Type locality

(Co-)Type locality

Schweden/Västmanlands, Provinz/Norberg

Preface

Author (Name, Year)

Peacor & Dunn, 1988

References

American Mineralogist 73 (1988), 838

IMA group assignments

Other languages

German

Dollaseit-(Ce)

English

Dollaseite-(Ce)

French

Dollaseite-(Ce)

Spanish

Dollaseíta-(Ce)

Russian

Долласеит-(Ce)

Alternative Name

Magnesium Orthite

CNMNC symbol

Symbol

Dls-Ce

Locations with GPS information