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Omongwaite

Formula:
Na
 
2
Ca
 
5
(SO
 
4
)
 
6
·3H
 
2
O
System:Monoclinic
Name:Named after the type locality.


Closely related and very similar to bassanite; found as tiny inclusions in gypsum.
Known as a synthetic phase; some of the Na can be replaced by K.

Classification of Omongwaite

IMA status:Approved 2008
Nickel-Strunz 10th (pending) edition ID:7.CD.65

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
C : Sulfates (selenates, etc.) without additional anions, with H2O
D : With only large cations
Dana 8th edition ID:29.6.1.2

29 : HYDRATED ACID AND NORMAL SULFATES
6 : AXO4·xH2O
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Type Occurrence of Omongwaite

Type Locality:Omongwa salt pan, Kalahari desert, Omaheke Region, Namibia
Geological Setting of type material:Inclusions in gypsum crystals in recent evaporite.
Associated Minerals at type locality:
Gypsum

Crystallography of Omongwaite

Crystal System:Monoclinic
Class (H-M):2 - Sphenoidal
Space Group:B2 {B1 1 2} {C2} {C1 2 1}
Cell Parameters:a = 12.08(3) Å, b = 6.96(1) Å, c = 6.39(2) Å
β = 90.2°
Ratio:a:b:c = 1.736 : 1 : 0.918
Unit Cell Volume:V 537 ų
Z:1
Comment:SG C2
X-Ray Powder Diffraction:
d-spacingIntensity
6.028 (40)
3.484 (29)
3.019 (51)
3.014 (100)
2.824 (34)
2.820 (65)
1.853 (23)

Chemical Properties of Omongwaite

Formula:
Na
 
2
Ca
 
5
(SO
 
4
)
 
6
·3H
 
2
O
Essential elements:Ca, H, Na, O, S
All elements listed in formula:Ca, H, Na, O, S

Relationship of Omongwaite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
7.CD.05Matteuccite
NaHSO
 
4
·H
 
2
O
7.CD.10Mirabilite
Na
 
2
SO
 
4
·10H
 
2
O
7.CD.15Lecontite
(NH
 
4
,K)Na(SO
 
4
)·2H
 
2
O
7.CD.20Hydroglauberite
Na
 
10
Ca
 
3
(SO
 
4
)
 
8
·6H
 
2
O
7.CD.25Eugsterite
Na
 
4
Ca(SO
 
4
)
 
3
·2H
 
2
O
7.CD.30Görgeyite
K
 
2
Ca
 
5
(SO
 
4
)
 
6
·H
 
2
O
7.CD.35Koktaite
(NH
 
4
)
 
2
Ca(SO
 
4
)
 
2
·H
 
2
O
7.CD.35Syngenite
K
 
2
Ca(SO
 
4
)
 
2
·H
 
2
O
7.CD.40Gypsum
Ca[SO
 
4
] · 2H
 
2
O
7.CD.45Bassanite
Ca[SO
 
4
] · 0.5H
 
2
O
7.CD.50Zircosulfate
(Zr,Ti)(SO
 
4
)
 
2
·4H
 
2
O
7.CD.55Schieffelinite
Pb
 
8
(TeO
 
4
)
 
5
(SO
 
4
)
 
3
·8H
 
2
O
7.CD.60Montanite
Bi
 
2
[TeO
 
6
] · 2H
 
2
O

Other Names for Omongwaite

Synonyms:
IMA2003-054b
Other Languages:

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Omongwaite

Reference List:Mees, F., Hatert, F., Rowe, R. (2008): Omongwaite, Na2Ca5(SO4)6.3H2O, a new mineral from recent salt lake deposits, Namibia. Mineralogical Magazine 72, 1209-1220.

Internet Links for Omongwaite

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    Localities for Omongwaite

    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Namibia
     
    • Omaheke Region
      • Kalahari desert
    		Min. Mag. 72,1209-1220(2008)
    Mineral and/or Locality
    Google
     
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