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Omongwaite

Collectors Summary

Color farblos bis milchigweiß
Streak color weiß
Lustre Glasglanz
Cleavages keine
Crystal System monoklin, C2

Chemism

Chem­ical formula

Na2Ca5(SO4)6·3H2O

Addi­tional chem. informa­tion

Verwandt mit Bassanit

Chem­ical com­po­si­tion

Calcium, Natrium, Sauerstoff, Schwefel, Wasserstoff

Unit weight: 876.7968324 u; Number of atoms in the formula: 46

Info

Empirical formula:

Na2Ca5(SO4)6·3H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

0.69

6

13.04

1.0079470

6.0476820

Oxygen

O

49.27

27

58.70

15.9994300

431.9846100

Sodium

Na

5.24

2

4.35

22.9897702

45.9795404

Sulfur

S

21.94

6

13.04

32.0655000

192.3930000

Calcium

Ca

22.86

5

10.87

40.0784000

200.3920000

Anal­y­sis wt%

SO3 : 56.16, CaO : 30.82, Na2O : 5.25, K2O : 3.21, H2O : 6.25 (Ref: Mineralogical Magazine 2008)

Strunz 9th edi­tion incl. updates

7.CD.65

7: Sulfate (Selenate, Tellurate, Chromate, Molybdate, Wolframate)
C: Sulfate (Selenate, etc.) ohne weitere Anionen, mit H2O
D:
65:

Lapis Clas­sifica­tion

VI/C.21-035

VI: SULFATE, CHROMATE, MOLYBDATE UND WOLFRAMATE
C: Wasserhaltige Sulfate, ohne fremde Anionen
21: Sehr große Kationen

Clas­sifica­tion by Hölzel

7.CC.555

7: SULFATES CHROMATES MOLYBDATES WOLFRAMATES
C: Sulfates (-Anions +Water)
C: Alunogen-Group

IMA sta­tus

anerkannt Sept. 2008

Min­eral sta­tus

anerkanntes Mineral

Optical Properties

Color

farblos bis milchigweiß

Streak color

weiß

Lus­tre

Glasglanz

max. Birefrin­gence

0.015

Birefringence chart\! Omongwaite title=Birefringence chart Omongwaite

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

1.556

RI value γ / ε

1.567

Ri mean

1.540

2V angle

b nd 15°~

Optical Data Luminescence

Lumi­nes­cence

keine Fluoreszenz bekannt

Crystallography

Crystal Sys­tem

monoklin

Class (H-M)

2

Space Group number

5

Space Group

C2

Cell param­e­ters a (Å)

12.08

Cell param­e­ters b (Å)

6.96

Cell param­e­ters c (Å)

6.39

Cell param­e­ters a/b or c/a

1.736

Cell param­e­ters c/b

0.918

Cell param­e­ters α

90°

Cell param­e­ters β

90.20

Cell param­e­ters γ

90°

Z

1

Volumne (ų)

537.247

X-Ray Pow­der Diffrac­tion

6.028(40), 3.484(29), 3.019(51), 3.014(100), 2.824(34), 2.820(65), 1.853(23), 1.855(24)

XRD chart Omongwaite

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

Crystals 3D

Open larger view

Crystal Structure 3D

Open larger view

Physical Properties

Density (g/cm³)

2.72

2.71 ( ρ calc. Mineralienatlas )

Cleav­ages

keine

Chem­ical Prop­er­ties and Tests

besser als Gips wasserlöslich

(Co-)Type locality

(Co-)Type locality

Namibia/Omaheke, Region/Kalahariwüste/Omongwa Salzpfanne

Preface

Occurrences

als mikroskopisch kleine Prismen (<0,02 x 0,2 mm) mit 6-eckige Querschnitt und keilförmigen Enden in Gipskristallen orientiert eingewachsen.

Gen­er­a­tion con­di­tions

rezent an Salzseen

Asso­cia­tions

Gips

Name from

Typlokalität

Author (Name, Year)

Florias Mees, 2008

References

IMA WEB Seite - Neue Mineralien Sept. 2008

Mees, F, et al. Min Mag. 72 S. 1307-1318 (2008)

Lapis Jg 34 Nr. 10 (Okt. 2009) S. 65

Related minerals "Strunz Classification" (9. Edition) [Mineral | Chemical formula | Crystal system : Class (H-M) : Space Group | Indenture number]

Omongwaite

Na2Ca5(SO4)6·3H2O

monoklin : 2 : C2

7.CD.65

Related minerals "Lapis Classification" [Mineral | Chemical formula | Crystal system : Class (H-M) : Space Group | Indenture number]

Matteuccite

NaHSO4·H2O

monoklin : m : Aa

VI/C.21-010

Lecontite

(NH4,K)Na(SO4)·2H2O

orthorhombisch : 222 : P212121

VI/C.21-020

Eugsterite

Na4Ca(SO4)3·2H2O

VI/C.21-030

Omongwaite

Na2Ca5(SO4)6·3H2O

monoklin : 2 : C2

VI/C.21-035

Hydroglauberite

Na4Ca(SO4)3·2H2O

VI/C.21-040

'Wattevillite'

Na2Ca(SO4)2·4H2O

VI/C.21-050

Syngenite

K2Ca(SO4)2·H2O

monoklin : 2/m : P21/m

VI/C.21-060

Koktaite

(NH4)2Ca(SO4)2·H2O

monoklin : 2/m : P21/m

VI/C.21-070

Mirabilite

Na2SO4·10 H2O

monoklin : 2/m : P21/c

VI/C.21-080

Related minerals "Hoelzel Classification" [Mineral | Chemical formula : Crystal system : Class (H-M) | Space Group | Indenture number]

'Caichengyunite'

(Fe2+)3Al2(SO4)6·30 H2O

7.CC.500

Omongwaite

Na2Ca5(SO4)6·3H2O

monoklin : 2 : C2

7.CC.555

Other languages

German

Omongwait

Spanish

Omongwaita

English

Omongwaite

Simplified Chinese

水钠钙矾石

Alternative Name

Na-polyhalite

IMA Number

IMA 2003-054b

Automatic Links to external internet sources (Responsibility is with the operator)

German pages

DeWikiPedia - search for: Omongwait
Google-Bilder-Suche - search for: Omongwait
Mineralogisch-Petrographisches-Institut Hamburg - search for: Omongwait

English pages

Mindat - search for: Omongwaite
Webmineral - search for:Omongwaite
Handbook-of-Mineralogy - search for: Omongwaite
RRUFF - Raman, XRD and other mineral data - search for: Omongwaite
RRUFF - References and PDF downloads - search for: Omongwaite
American-Mineralogist-Crystal-Structure-Database - search for: Omongwaite
Athena - search for: Omongwaite

Mineral Dealer

German pages

hausen - Mineralgroßhandel - search for: Omongwait
Crystal-Treasure.com - search for: Omongwait
Bosse - search for: Omongwait

Locations with GPS information