Gwihabaite Mineral Data

Gwihabaite Mineral Data
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General Gwihabaite Information

Help on Chemical Formula: Chemical Formula: (NH4,K)(NO3)
Help on Composition: Composition: Molecular Weight = 85.31 gm
   Potassium  11.46 %  K
   Hydrogen    3.54 %  H
   Nitrogen   28.73 %  N
   Oxygen     56.26 %  O
             ______ 
             100.00 % 
Help on Empirical Formula: Empirical Formula: (NH4)0.75K0.25(NO3)
Help on Environment: Environment: As efflorescences on the walls, boulders, bat quano, and earthy floor of the cave and as saline crusts coating boulders in a dolomite hill in the Kalahari Basin.
Help on IMA Status: IMA Status: Approved IMA 1999 (Dana # Added)
Help on Locality: Locality: Gewihaba Cave (also known as Drotsky's Cave), northwestern Botswana, 280 km west of Maun. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after it's locality.
Help on Name Pronunciation: Name Pronunciation: Gwihabaite + Pronunciation Say GWIHABAITE
Help on Synonym: Synonym: ICSD 28078
  IMA1994-011
  Nitrammite
  PDF 50-1566
 

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Gwihabaite Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =0.9251:1:0.7557
Help on Cell Dimensions: Cell Dimensions: a = 7.075, b = 7.647, c = 5.779, Z = 4; V = 312.66 Den(Calc)= 1.81
Help on Crystal System: Crystal System: Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pbnm
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.194(1), 3.212(0.95), 2.595(0.9),
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Forms: ( 1 0 0) ( 1 1 1) ( 1 1 0)

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Amoros J L , Arrese F , Canut M , Zeitschrift fur Kristallographie , 117 (1962) p.92-107, The crystal structure of the low-temperature phase of NH4NO3(V) at -150 deg C, Note: sample at T = -150 C, this is a low temperature form

 

Physical Properties of Gwihabaite

Help on Cleavage: Cleavage: None
Help on Color: Color: Colorless, White.
Help on Density: Density: 1.77
Help on Diaphaneity: Diaphaneity: Transparent
Help on Habit: Habit: Acicular - Occurs as needle-like crystals.
Help on Habit: Habit: Efflorescences - Crystals covering matrix, generally produced from transpiro-evaporation.
Help on Hardness: Hardness: 5 - Apatite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Gwihabaite

Help on Optical Data: Optical Data: Biaxial (-), a=1.458, b=1.527, g=1.599, bire=0.1410, 2V(Calc)=86, 2V(Meas)=90. Dispersion none.
 

Calculated Properties of Gwihabaite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=1.87 gm/cc
note: Specific Gravity of Gwihabaite =1.81 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.28
Boson Index = 0.72
Help on Photoelectric: Photoelectric: PEGwihabaite = 1.40 barns/electron
U=PEGwihabaite x relectron= 2.62 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 170.55 (Gamma Ray American Petroleum Institute Units)
Concentration of Gwihabaite per GRapi unit = 0.59 (%)

Estimated Radioactivity from Gwihabaite - barely detectable

 

Gwihabaite Classification
Help on Dana Class: Dana Class: 18.01.02.02 (18)Simple Nitrates
  (18.01)where A xNO3 · x(H2O), x can equal zero
  (18.01.02)Niter Series
 
18.01.02.01 Niter KNO3 Pmcn 2/m 2/m 2/m
 
18.01.02.02 Gwihabaite! (NH4,K)(NO3) Pbnm 2/m 2/m 2/m
Help on Strunz Class: Strunz Class: 05.NA.15 05 - CARBONATES (NITRATES)
  05.N - NITRATES
  05.NA -Without OH or H2O
 
05.NA.15 Gwihabaite! (NH4,K)(NO3) Pbnm 2/m 2/m 2/m
 

Other Gwihabaite Information
Help on References: References: NAME( MinRec) PHYS. PROP.(Am.Min.,Vol.84,p194,1999) OPTIC PROP.(MinRec)
Help on See Also: See Also: Links to other databases for Gwihabaite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - Google Images
4 - Google Scholar
5 - Handbook of Mineralogy (MinSocAm)
6 - Handbook of Mineralogy (UofA)
7 - MinDAT
8 - MinMax(Deutsch)
9 - MinMax(English)
10 - Mineralienatlas (Deutsch)
11 - QUT Mineral Atlas
12 - Ruff.Info

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Gwihabaite

(NH4,K)(NO3)
Dana No: 18.01.02.02 Strunz No: 05.NA.15
Locality:

 

Notes: