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Guidottiite

Collectors Summary

Cleavages vollkommen (001)
Fracture halbmuschelig
Crystal System hexagonal, P63

Chemism

Chemical formula

Mn2Fe3+(SiFe3+)O5(OH)4

Additional chem. information

Serpentin-Gruppe

Chemical composition

Eisen, Mangan, Silicium, Sauerstoff, Wasserstoff

Unit weight: 397.6786878 u; Number of atoms in the formula: 18

Info

Empirical formula:

Mn2Fe(SiFe)O5(OH)4

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

1.01

4

22.22

1.0079470

4.0317880
Oxygen

O

36.21

9

50.00

15.9994300

143.9948700
Silicon

Si

7.06

1

5.56

28.0855300

28.0855300
Manganese

Mn

27.63

2

11.11

54.9380499

109.8760998
Iron

Fe

28.09

2

11.11

55.8452000

111.6904000

Strunz 9th edition incl. updates

9.ED.15

9: Silikate (Germanate)
E: Schichtsilikate (Phyllosilikate)
D: Schichtsilikate (Phyllosilikate) mit [Kaolinit]-Schichten, zusammengesetzt aus tetrahedralen oder octahedralen Netzen
15:Serpentin-Gruppe

Lapis Classification

VIII/H.27-130

VIII: SILIKATE
H: Schichtsilikate
27: Glimmerartige Schicht-silikate mit Baugruppen [Si4O10] 4- und verwandte Strukturen; Serpentin-Gruppe

Classification by Hölzel

9.EM.340

9: SILICATES
E: Phyllosilicates
M: Serpentine-Group
3: Lizardite-Group

IMA status

anerkannt, IMA Web-Seite - Neue Mineralien Nov. 2009

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

 Kaolinite-Serpentine Group  ⇒ Serpentine subgroup

Optical Properties

RI value α / ω / n

1.765

Ri mean

1.765

2V angle

Uniaxial

Crystallography

Crystal System

hexagonal

Class (H-M)

6

Space Group number

173

Space Group

P63

Cell parameters a (Å)

5.547

Cell parameters b (Å)

-

Cell parameters c (Å)

14.293

Cell parameters a/b or c/a

2.577

Cell parameters c/b

-

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

120°

Z

2

Volume (ų)

380.864

Crystal structure

Struktur bestimmt

X-Ray Powder Diffraction

7.21(100), 3.543(50), 2.706(14), 2.568(39), 2.381(25), 1.982(26), 1.640(12), 1.498(10)
XRD chart Guidottiite

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

Crystals 3D

Open larger view

Crystal Structure 3D

Open larger view

Physical Properties

VHN (Hardness Vickers)

230 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

3.467 ( ρ calc. Mineralienatlas )

Cleavages

vollkommen (001)

Fracture

halbmuschelig

(Co-)Type locality

(Co-)Type locality

Südafrika/Nordkap (Northern Cape), Provinz/Kalahari Manganese Field/Kuruman/N'Chwaning Mines (NChwaning Mines)/N'Chwaning II Mine

Preface

Author (Name, Year)

Stephen Guggenheim, 2009

References

Neue Mineralien - IMA Web-Seite November 2009

IMA group assignments

Other languages

German

Guidottiit

English

Guidottiite

Russian

Гвидоттиит

CNMNC (IMA)-Number

IMA 2009-061

CNMNC symbol

Symbol

Gdt

Locations with GPS information

IDs

GUSID (Global unique identifier short form) bhAYzer41EWwPn6DxRBbRg
GUID (Global unique identifier) CD18106E-F8EA-45D4-B03E-7E83C5105B46
Database ID 5299