Mindat Logo
Home Page Log In Message Board The Mindat Directory
Register Search Pages Mineral Chatroom The Mindat Store

Omongwaite

This page is currently not sponsored. Click here to sponsor this page.



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
mindat.org URL:http://www.mindat.org/min-38831.html
Please feel free to link to this page.

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)
1.855 (24)

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)NaSO
 
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
CaSO
 
4
 · 2H
 
2
O
7.CD.45Bassanite
CaSO
 
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

Search Engines:
  • Look for Omongwaite on Google
  • Look for Omongwaite images on Google
    • External Links:
  • Look for Omongwaite on Webmineral
  • Look for Omongwaite on Athena Mineralogy
  • Look for Omongwaite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Mineral Dealers:
  • Search for minerals at Heliodor
  • Pricedownminerals.com - Reverse Auctions and Shop
  • Fine Minerals from Weinrich Minerals, Inc.
  • Rare and Unusual minerals at Mineralogical Research Company
  • DAKOTA MATRIX offers Cabinet and Rare Species from Worldwide Localities.
  • Edwards Minerals - Fine Specimens
  • Search for - Omongwaite - on e-Rocks Mineral Sales & Auctions
  • High-end worldwide specimens & outstanding customer service
  • Mineral Classics - Worldwide Collector Quality Minerals and Gems
  • Top quality minerals from Kristalle of California
  • The Arkenstone - Fine Minerals
  • Buy from David K Joyce minerals
    • Jobs:
  • Mining & Geology Jobs

    • Localities for Omongwaite

    Hide Locality List
    (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
    Search Google
     
    Copyright © Jolyon Ralph and Ida Chau 1993-2011. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
    Current server date and time: 9th Sep 2011 22:01:59
    Mineral and Locality Search
    Mineral:
    and/or Locality:
    Options
    Fade toolbar when not in focusFix toolbar to bottom of page
    Hide Social Media Links
    Slideshow frame delay seconds