Omongwaite Mineral Data (original) (raw)

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

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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 - SphenoidalH-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),

Click Here for Large Omongwaite Structure Window Crystal Structure:

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Help on Above

| | Freyer D , Reck G , Bremer M , Voigt W , Monatshefte fur Chemie , 130 (1999) p.1179-1193, Thermal behaviour and crystal structure of sodium-containing hemihydrates, of calcium sulfate, Note: supercell, Locality: synthetic | | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |

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:

29.04.07.02 (29)Hydrated Acid and Sulfates

(29.04)where (A+)2 Bn (XO4)p � x(H2O)

(29.04.07)Dana Group

29.04.07.01 Gorgeyite K2Ca5(SO4)6•(H2O) C 2/c 2/m

29.04.07.02 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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Ask about Omongwaite here :
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Print or Cut-and-Paste your Omongwaite Specimen Label here :

Omongwaite

Na2Ca5(SO4)6•3H2O
Dana No: 29.04.07.02 Strunz No: 07.CD.65
Locality:

Notes: