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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

Volume (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

Other languages

German

Omongwait

Spanish

Omongwaita

English

Omongwaite

Simplified Chinese

水钠钙矾石

Alternative Name

Na-polyhalite

CNMNC (IMA)-Number

IMA 2003-054b

CNMNC symbol

Symbol

Omo

Locations with GPS information

IDs

GUSID (Global unique identifier short form) LH3uDxcyZkK6WuWWmApX8g
GUID (Global unique identifier) 0FEE7D2C-3217-4266-BA5A-E596980A57F2
Database ID 4977