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Mundrabillaite Mineral Data

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General Mundrabillaite 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)2Ca(HPO4)2•(H2O)
Help on Environment: Environment: Found with other salts in the cave floor.
Help on IMA Status: IMA Status: Approved IMA 1983
Help on Locality: Locality: Petrogale Cave near Mundrabilla Station, WA, Australia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Name Pronunciation: Name Pronunciation: Mundrabillaite + Pronunciation Say MUNDRABILLAITE

Mundrabillaite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.056:1:0.7833
Help on Cell Dimensions: Cell Dimensions: a = 8.643, b = 8.184, c = 6.411, Z = 2; beta = 98° V = 449.06 Den(Calc)= 2.12
Help on Crystal System: Crystal System: Monoclinic Space Group: Pm,P 2,P 2/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 4.279(1), 3.106(0.6), 3.687(0.4),

Physical Properties of Mundrabillaite

Help on Color: Color: Colorless.
Help on Density: Density: 2.05
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Habit: Habit: Microscopic Crystals - Crystals visible only with microscopes.
Help on Hardness: Hardness: 1-2 - Between Talc and Gypsum
Help on Luster: Luster: Earthy (Dull)
Help on Streak: Streak: white

Optical Properties of Mundrabillaite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.504 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.454 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2541,KPDmeas= 0.2628,KC= 0.1748
Ncalc = 1.36 - 1.37
Help on Optical Data: Optical Data: Biaxial (-), a=1.521-1.522, b=1.542-1.544, g=1.551-1.552, bire=0.0300, 2V(Calc)=60-64, 2V(Meas)=65.

Calculated Properties of Mundrabillaite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.19 gm/cc
note: Specific Gravity of Mundrabillaite =2.12 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.09
Boson Index = 0.91
Help on Photoelectric: Photoelectric: PEMundrabillaite = 2.74 barns/electron
U=PEMundrabillaite x rElectron Density= 6.01 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Mundrabillaite is Not Radioactive

Mundrabillaite Classification

Help on  Dana Class: Dana Class: (39)Hydrated Acid Phosphates, etc
  (39.03)with miscellaneous formulae
  (39.03.03)Dana Group Mundrabillaite (NH4)2Ca(HPO4)2•(H2O) Pm,P 2,P 2/m Mono
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 Mundrabillaite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Mundrabillaite :
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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