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Swaknoite Mineral Data

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General Swaknoite Information

Help on Chemical  Formula: Chemical Formula: (NH4)2Ca(HPO4)2•(H2O)
Help on Composition: Composition: Molecular Weight = 286.13 gm
   Calcium     14.01 %  Ca   19.60 % CaO
   Phosphorus  21.65 %  P    49.61 % P2O5
   Hydrogen     2.82 %  H      -   % Calc as (NH4)2O
   Hydrogen     1.41 %  H    12.59 % H2O
   Nitrogen     9.79 %  N    18.20 % (NH4)2O
   Oxygen      50.33 %  O
              ______        ______ 
              100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: (NH4)2•(H2O)Ca(HPO4)2
Help on Environment: Environment: Dolomite walls of the Arnhem cave.
Help on IMA Status: IMA Status: Approved IMA 1991
Help on Locality: Locality: Windhoek, Namibia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the acronym for the Siud Wes Aftica Karst Navorsing Organisasie (SWANKNO), a speleological association in Namibia.
Help on Name Pronunciation: Name Pronunciation: Swaknoite + Pronunciation Say SWAKNOITE
Help on Synonym: Synonym: IMA1991-021

Swaknoite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =2.8311:1:0.875
Help on Cell Dimensions: Cell Dimensions: a = 20.959, b = 7.403, c = 6.478, Z = 4; V = 1,005.12 Den(Calc)= 1.89
Help on Crystal System: Crystal System: Orthorhombic Space Group: Unk
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 6.99(1), 3.705(0.89), 10.5(0.57),

Physical Properties of Swaknoite

Help on Color: Color: White.
Help on Density: Density: 1.91
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Acicular - Occurs as needle-like crystals.
Help on Habit: Habit: Rosette - Bundled tabular aggregates resembling rose flower petals.
Help on Hardness: Hardness: 1.5-2 - Talc-Gypsum
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Swaknoite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.526 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.542 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2695,KPDmeas= 0.2667,KC= 0.1748
Ncalc = 1.33
Help on Optical Data: Optical Data: Biaxial (+), a=1.506, b=1.51, g=1.512, bire=0.0060, 2V(Calc)=70, 2V(Meas)=65-70.

Calculated Properties of Swaknoite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=1.98 gm/cc
note: Specific Gravity of Swaknoite =1.91 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.09
Boson Index = 0.91
Help on Photoelectric: Photoelectric: PESwaknoite = 2.74 barns/electron
U=PESwaknoite x rElectron Density= 5.42 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Swaknoite is Not Radioactive

Swaknoite Classification

Help on  Dana Class: Dana Class: (39)Hydrated Acid Phosphates, etc
  (39.03)with miscellaneous formulae
  (39.03.04)Dana Group Swaknoite (NH4)2Ca(HPO4)2•(H2O) Unk Ortho
Help on  Strunz Class: Strunz Class: 08.CJ.10 08 - PHOSPHATES, ARSENATES, VANADATES
  08.C - Phosphates without Additional Anions, with H2O
  08.CJ -With only large cations
08.CJ.10 Mundrabillaite (NH4)2Ca(HPO4)2•(H2O) Pm,P 2,P 2/m Mono
08.CJ.10 Swaknoite (NH4)2Ca(HPO4)2•(H2O) Unk Ortho

Other Swaknoite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Am.Min.,Vol.78,p1110,1993) OPTIC PROP.(Am.Min.,Vol.78,p1110,1993)
Help on See Also: See Also: Links to other databases for Swaknoite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 08.CJ.10





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