Mineralogy Database

Omongwaite Mineral Data

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General Omongwaite Information

Help on Chemical  Formula: Chemical Formula: Na2Ca5(SO4)6•3H2O
Help on Composition: Composition: Molecular Weight = 880.31 gm
   Potassium   2.62 %  K     3.16 % K2O
   Sodium      3.84 %  Na    5.17 % Na2O
   Calcium    21.67 %  Ca   30.32 % CaO
   Hydrogen    0.69 %  H     6.14 % H2O
   Sulfur     22.11 %  S    55.21 % SO3
   Oxygen     49.07 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na1.47K0.59Ca4.76S6.07O24•3(H2O)
Help on Environment: Environment: Found in inclusions in gypsum crystals in recent salt lake deposits. Related to bassanite.
Help on IMA Status: IMA Status: Approved IMA 2005 (Dana # Added)
Help on Locality: Locality: Omongwa (salt) pan, near Aminuis, 140 km SSE of Gobabis, southwestern Kalahari, Namibia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality
Help on Synonym: Synonym: IMA2003-054b

Omongwaite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.7356:1:0.9181
Help on Cell Dimensions: Cell Dimensions: a = 12.08, b = 6.96, c = 6.39, Z = 1; beta = 90.2° V = 537.25 Den(Calc)= 2.72
Help on Crystal System: Crystal System: Monoclinic - Sphenoidal H-M Symbol (2) Space Group: C 2
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.014(1), 2.82(0.65), 3.019(0.51),6.028(0.4), 2.824(0.34), 3.484(0.29), 1.855(0.24), 1.853(0.23),

Physical Properties of Omongwaite

Help on Color: Color: White.
Help on Diaphaneity: Diaphaneity: Transparent
Help on Habit: Habit: Inclusions - Generally found as inclusions in other minerals.
Help on Habit: Habit: Pseudo Hexagonal - Crystals show a hexagonal outline.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Omongwaite

Help on Optical Data: Optical Data: NCalc= 1.54 - from Gladstone-Dale relationship (KC = 0.1983) where Ncalc=Dcalc*KC+1

Calculated Properties of Omongwaite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.73 gm/cc
note: Specific Gravity of Omongwaite =2.72 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.002190571
Boson Index = 0.997809429
Help on Photoelectric: Photoelectric: PEOmongwaite = 4.31 barns/electron
U=PEOmongwaite x relectron= 11.77 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 37.94 (Gamma Ray American Petroleum Institute Units)
Concentration of Omongwaite per GRapi unit = 2.64 (%)

Estimated Radioactivity from Omongwaite - barely detectable


Omongwaite Classification

Help on  Dana Class: Dana Class: (29)Hydrated Acid and Sulfates
  (29.04)where (A+)2 Bn (XO4)p � x(H2O)
  (29.04.07)Dana Group Gorgeyite K2Ca5(SO4)6•(H2O) C 2/c 2/m Omongwaite! Na2Ca5(SO4)6•3H2O C 2 2
Help on  Strunz Class: Strunz Class: 07.CD.65 07 - SULFATES (SELENATES, TELLURATES)
  07.C - Sulfates (selenates, etc.) without Additional Anions, with H2O
  07.CD -With only large cations
07.CD.65 Omongwaite! Na2Ca5(SO4)6•3H2O C 2 2

Other Omongwaite Information

Help on References: References: NAME( MinMag, v72:1307) PHYS. PROP.(MinMag, v72:1307)
Help on See Also: See Also: Links to other databases for Omongwaite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Dana No: Strunz No: 07.CD.65





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