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Julgoldite-(Fe3+)

Collectors Summary

Hardness (Mohs) 4.5
Crystal System monoklin, A2/m

Chemism

Chemical formula

Ca2Fe3+Fe3+2(Si2O7)(SiO4)O(OH)·H2O

Chemical composition

Calcium, Eisen, Silicium, Sauerstoff, Wasserstoff

Unit weight: 558.964851 u; Number of atoms in the formula: 25

Info

Empirical formula:

Ca2FeFe2(Si2O7)(SiO4)O(OH)·H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

0.54

3

12.00

1.0079470

3.0238410

Oxygen

O

40.07

14

56.00

15.9994300

223.9920200

Silicon

Si

15.07

3

12.00

28.0855300

84.2565900

Calcium

Ca

14.34

2

8.00

40.0784000

80.1568000

Iron

Fe

29.97

3

12.00

55.8452000

167.5356000

Strunz 9th edition incl. updates

9.BG.20

9: Silikate (Germanate)
B: Gruppensilikate (Sorosilikate)
G: Gruppen(Soro)-Silikate mit gemischten SiO4 und Si2O7 Gruppen; Kationen in oktahedraler [6] und größerer Koordination
20:

Lapis Classification

VIII/C.24-068

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

Classification by Hölzel

9.BN.525

9: SILICATES
B: Sorosilicates
N: With SiO4 + Si2O7
5: Pumpellyite-Group

Dana 8th edition

58.02.02.02

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)
02: Pumpellyite group

IMA status

anerkannt 1966

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

Pumpellyite group

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

12

Space Group

A2/m

Cell parameters a (Å)

8.922

Cell parameters b (Å)

6.081

Cell parameters c (Å)

19.432

Cell parameters a/b or c/a

1.467

Cell parameters c/b

3.196

Cell parameters α

90°

Cell parameters β

97.6

Cell parameters γ

90°

Z

4

Volumne (ų)

1045.016

X-Ray Powder Diffraction

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

4.5

Density (g/cm³)

3.56 (berechnet)

3.553 ( ρ calc. Mineralienatlas )

Preface

Author (Name, Year)

Passaglia, Gottardi (1973)

References

Canadian Mineralogist (1973): 12: 219.

Mineralogical Magazine (1973): 39: 271.

IMA group assignments

Other languages

German

Julgoldit-(Fe3+)

English

Julgoldite-(Fe3+)

Japanese

鉄ジュルゴルド石

Alternative Name

Russian

Джулголдит-(Fe3+)

CNMNC (IMA)-Number

IMA 1966-033

CNMNC symbol

Symbol

Jul-Fe3+

Locations with GPS information