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Sturtite

Collectors Summary

Color schwarz
Streak color gelblich braun
Hardness (Mohs) 3.5
Solubility +++ Säuren
Crystal System amorph,

Chemism

Chemical formula

Fe3+(Mn2+,Ca,Mg)Si4O10(OH)3·10 H2O

Additional chem. information

Sturtit = Hisingerit oder Neotocit (American Mineralogist 69 (1984), 215.)

Chemical composition

Calcium, Eisen, Magnesium, Mangan, Silicium, Sauerstoff, Wasserstoff

Unit weight: 606.77384694 u; Number of atoms in the formula: 52

Info

Empirical formula:

Fe(Mn0.6Ca0.3Mg0.1)Si4O10(OH)3·10H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

3.82

23

44.23

1.0079470

23.1827810

Oxygen

O

60.65

23

44.23

15.9994300

367.9868900

Magnesium

Mg

0.40

0.1

0.19

24.3050600

2.4305060

Silicon

Si

18.51

4

7.69

28.0855300

112.3421200

Calcium

Ca

1.98

0.3

0.58

40.0784000

12.0235200

Manganese

Mn

5.43

0.6

1.15

54.9380499

32.9628299

Iron

Fe

9.20

1

1.92

55.8452000

55.8452000

Analysis wt%

SiO2 : 40.50, Al2O3 : 3.80, Fe2O3 : 4.80, MnO : 23.70, CaO : 2.20, H2O : 25.10 (Ref: Doklady Akademiia Nauk, SSSR 78)

Classification by Hölzel

9.EG.270

9: SILICATES
E: Phyllosilicates
G: Hydrated Micas
2: With Mn

IMA status

diskreditiert, IMA Massendiskreditierung 11/2006 (Antrag 06-C)

Optical Properties

Color

schwarz

Streak color

gelblich braun

RI value α / ω / n

1.490

Ri mean

1.490

2V angle

Isotropisch

Crystallography

Crystal System

amorph

Cell parameters a (Å)

-

Cell parameters b (Å)

-

Cell parameters c (Å)

-

Cell parameters a/b or c/a

-

Cell parameters c/b

-

Cell parameters α

-

Cell parameters β

-

Cell parameters γ

-

Z

-

Volumne (ų)

-

Physical Properties

Hardness (Mohs)

3.5

Density (g/cm³)

2.05

Instability

+++ Säuren

(Co-)Type locality

(Co-)Type locality

Australien/New South Wales/Yancowinna Co./Broken Hill

Preface

Author (Name, Year)

Hodge-Smith, 1930

References

Doklady Akad.Nauk SSSR (1978) 243, 1292.

Amer.Mineral. (1980) 65, 210

Clay Minerals (1983) 18, 21

American Mineralogist 69 (1984), 215.

Canadian Mineralogist Vol. 44, pp. 1557-1560 (2006)

Other languages

German

Sturtit

Spanish

Sturtita

English

Sturtite

French

Sturtite

Locations with GPS information