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Windhoekite

Pictures (1 Images total)

Windhoekit (?) mit Aegirin und Natrolith
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1574863278
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Windhoekit (?) mit Aegirin und Natrolith
Namibia/Khomas, Region/Windhoek-Land, Kreis/Aris/Aris-Steinbrüche (Ariskop Quarry; Railway Quarry), BB = 3,8 mm
Copyright: Hannes Osterhammer; Contribution: Münchener Micromounter
Collection: Lithothek der Münchener Micromounter, Collection number: A042046, Donator: Rudolf Berrenrath
Location: Namibia/Khomas, Region/Windhoek-Land, Kreis/Aris/Aris-Steinbrüche (Ariskop Quarry; Railway Quarry)
Mineral: Windhoekite
Image: 1574863278
License: Usage for Mineralienatlas project only
Windhoekit (?) mit Aegirin und Natrolith (SNr: A042046)

Namibia/Khomas, Region/Windhoek-Land, Kreis/Aris/Aris-Steinbrüche (Ariskop Quarry; Railway Quarry), BB = 3,8 mm

Collection: Lithothek der Münchener Micromounter
Copyright: Hannes Osterhammer
Contribution: Münchener Micromounter 2019-11-27
Locality: Aris-Steinbrüche (Ariskop Quarry; Railway Quarry) / Aris / Windhoek-Land, Kreis / Khomas, Region / Namibia

Collectors Summary

Color gelb-braun
Streak color beige
Crystal System monoklin, C2/m

Chemism

Chemical formula

Ca2Fe3+2.67[Si8O20](OH)4·10H2O

Additional chem. information

Palygorskit-Gruppe

Chemical composition

Calcium, Eisen, Silicium, Sauerstoff, Wasserstoff

Unit weight: 1022.119072 u; Number of atoms in the formula: 70.67

Info

Empirical formula:

Ca2Fe2.67[Si8O20](OH)4·10H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

2.37

24

33.96

1.0079470

24.1907280

Oxygen

O

53.22

34

48.11

15.9994300

543.9806200

Silicon

Si

21.98

8

11.32

28.0855300

224.6842400

Calcium

Ca

7.84

2

2.83

40.0784000

80.1568000

Iron

Fe

14.59

2.67

3.78

55.8452000

149.1066840

Analysis wt%

SiO2 : 47.04, Fe2O3 : 20.83, CaO : 10.98, H2O : 21.16 (Ref: berechnet)

Strunz 9th edition incl. updates

9.EE.20

9: Silikate (Germanate)
E: Schichtsilikate (Phyllosilikate)
E: Einfache tetrahedrale Netze aus sechsfach-Ringen, verbunden über octahedrale Netze oder Bänder
20:Palygorskit-Gruppe

Lapis Classification

VIII/H.33-015

VIII: SILIKATE
H: Schichtsilikate
33: Schichtsilikate mit anderen Einfachschichten [Si6O15] 6- u.a.

Classification by Hölzel

9.EQ.150

9: SILICATES
E: Phyllosilicates
Q: Palygorskite-Sepiolite-Group

IMA status

anerkannt - IMA Commission on New Minerals, Nomenclature and Classification (CNMNC), März - April 2011 (Newsletter 9)

Mineral status

anerkanntes Mineral

Optical Properties

Color

gelb-braun

Streak color

beige

Diaphaneity (Transparency)

durchscheinend

Pleochroism

stark ausgeprägt y ≈ Z > X, braun zu dunkelbraun; Orientierung X ≈ a; Z = c

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

12

Space Group

C2/m

Cell parameters a (Å)

14.319

Cell parameters b (Å)

17.825

Cell parameters c (Å)

5.242

Cell parameters a/b or c/a

0.803

Cell parameters c/b

0.294

Cell parameters α

90°

Cell parameters β

103.50

Cell parameters γ

90°

Z

2

Volumne (ų)

1300.98

Kristall structure

Struktur bestimmt

X-Ray Powder Diffraction

11.04(100), 4.432(10), 4.134(6), 3.749(4), 3.486(11), 2.636(8), 2.550(4), 2.507(6)

XRD chart Windhoekite

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

Crystal Structure 3D

Open larger view

Physical Properties

Density (g/cm³)

2.630 (berechnet) 2.62 (gemessen)

2.609 ( ρ calc. Mineralienatlas )

(Co-)Type locality

(Co-)Type locality

Namibia/Khomas, Region/Windhoek-Land, Kreis/Aris/Aris-Steinbrüche (Ariskop Quarry; Railway Quarry)

Type material

Sammlung des Fersman Mineralogischen Museum der russischen Akademie der Wissenschaften in Moskau, Russland

Collection number of type material

4018/1

Preface

Name from

nach dem Landkreis, in dem die Typlokalität liegt; weitere Einzelheiten siehe Bruce Cairncross: The Where of Mineral Names: Windhoekite, Aris Quarry, Windhoek Rural, Khomas Region, Namibia. Rocks & Minerals Vol. 97, Issue 5 (2022) S. 464-470.

Author (Name, Year)

Chukanov, N.V., Britvin, S.N., Blab, G., Belakovsky, D.I. and Van, K.V. (2011)

References

Chukanov, N.V., Britvin, S.N., Blass, G., Belakovskiy, D.I., Van, K.V. (2011): Windhoekite, Ca2Fe3+2.67(Si8O20)(OH)4.10H2O, a new palygorskite-group mineral from the Aris phonolite, Namibia. European Journal of Mineralogy, 23.

http://forum.amiminerals.it/download/file.php?id=24618

Chukanov, N.V., Britvin, S.N., Blab, G., Belakovsky, D.I. and Van, K.V. (2011) Windhoekite, IMA 2010-083. CNMNC 2536 Newsletter No. 9, August 2011, page 2537; Mineralogical Magazine, 75, 2535-2540

Other languages

German

Windhoekit

English

Windhoekite

CNMNC (IMA)-Number

IMA 2010-083

CNMNC symbol

Symbol

Whk

Navigation

Weblinks

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