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Cassidyite Mineral Data

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General Cassidyite Information

Help on Chemical  Formula: Chemical Formula: Ca2(Ni,Mg)(PO4)2•2(H2O)
Help on Composition: Composition: Molecular Weight = 356.22 gm
   Calcium     22.50 %  Ca   31.48 % CaO
   Magnesium    1.71 %  Mg    2.83 % MgO
   Nickel      12.36 %  Ni   15.73 % NiO
   Phosphorus  17.39 %  P    39.85 % P2O5
   Hydrogen     1.13 %  H    10.11 % H2O
   Oxygen      44.91 %  O
              ______        ______ 
              100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca2Ni0.75Mg0.25(PO4)2•2(H2O)
Help on Environment: Environment: Alteration product of a highly weathered iron-nickel meteorite, formed by alteration of schreibersite.
Help on IMA Status: IMA Status: Approved IMA 1967
Help on Locality: Locality: Wolf Creek meteorite. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for William A. Cassidy, who mapped the Wolf Creek, Australia, crater in 1953.
 

Cassidyite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.8484:1:0.8038
Help on Cell Dimensions: Cell Dimensions: a = 5.71, b = 6.73, c = 5.41, Z = 1; alpha = 96.83°, beta = 107.4°, gamma = 104.6° V = 190.62 Den(Calc)= 3.10
Help on Crystal System: Crystal System: Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.7(1), 3.03(0.95), 2.67(0.79),
 

Physical Properties of Cassidyite

Help on Color: Color: Green, Light green.
Help on Density: Density: 3.1
Help on Diaphaneity: Diaphaneity: Transparent
Help on Hardness: Hardness: 3.5 - Copper Penny
Help on Luster: Luster: Vitreous (Glassy)
 

Optical Properties of Cassidyite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.026 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.01 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2087,KPDmeas= 0.2121,KC= 0.2068
Ncalc = 1.64 - 1.65
Help on Optical Data: Optical Data: Biaxial (?), a=1.64-1.65, g=1.67, bire=0.0200-0.0300
 

Calculated Properties of Cassidyite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.15 gm/cc
note: Specific Gravity of Cassidyite =3.15 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.00362311
Boson Index = 0.99637689
Help on Photoelectric: Photoelectric: PECassidyite = 8.45 barns/electron
U=PECassidyite x rElectron Density= 26.59 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Cassidyite is Not Radioactive
 

Cassidyite Classification

Help on  Dana Class: Dana Class: 40.02.02.04 (40)Hydrated Phosphates, etc
  (40.02)where A++ (B++)2 (XO4) � x(H2O)
  (40.02.02)Fairfieldite Subgroup (Triclinic: P-1�)
 
40.02.02.01 Fairfieldite Ca2(Mn,Fe)(PO4)2•2(H2O) P1 1
 
40.02.02.02 Messelite Ca2(Fe,Mn)(PO4)2•2(H2O) P1 1
 
40.02.02.03 Collinsite Ca2(Mg,Fe)(PO4)2•2(H2O) P1 1
 
40.02.02.04 Cassidyite Ca2(Ni,Mg)(PO4)2•2(H2O) P1 1
 
40.02.02.05 Talmessite Ca2Mg(AsO4)2•2(H2O) P1 1
 
40.02.02.06 Gaitite Ca2Zn(AsO4)2•2(H2O) P1 1
 
40.02.02.07 Roselite-beta Ca2(Co,Mg)(AsO4)2•2(H2O) P 1 or P1 Tri
 
40.02.02.08 Parabrandtite Ca2Mn(AsO4)•2(H2O) P1,P 1 Tri
 
40.02.02.09 Hillite! Ca2(Zn,Mg)[PO4]2•2(H2O) P1 1
 
40.02.02.10 Nickeltalmessite! Ca2Ni(AsO4)2•2H2O P 1
Help on  Strunz Class: Strunz Class: 08.CG.05 08 - PHOSPHATES, ARSENATES, VANADATES
  08.C - Phosphates without Additional Anions, with H2O
  08.CG -With large and medium-sized cations, RO4:H2O = 1:1
 
08.CG.05 Collinsite Ca2(Mg,Fe)(PO4)2•2(H2O) P1 1
 
08.CG.05 Gaitite Ca2Zn(AsO4)2•2(H2O) P1 1
 
08.CG.05 Cassidyite Ca2(Ni,Mg)(PO4)2•2(H2O) P1 1
 
08.CG.05 Fairfieldite Ca2(Mn,Fe)(PO4)2•2(H2O) P1 1
 
08.CG.05 Messelite Ca2(Fe,Mn)(PO4)2•2(H2O) P1 1
 
08.CG.05 Parabrandtite Ca2Mn(AsO4)•2(H2O) P1,P 1 Tri
 
08.CG.05 Uranophane-beta Ca[(UO2)SiO3(OH)]2•(H2O) P 21/a 2/m
 
08.CG.05 Talmessite Ca2Mg(AsO4)2•2(H2O) P1 1
 
08.CG.05 Hillite! Ca2(Zn,Mg)[PO4]2•2(H2O) P1 1
 

Other Cassidyite Information

Help on References: References: NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Cassidyite :
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
15 - WWW-MINCRYST

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Print or Cut-and-Paste your Cassidyite Specimen Label here :

Cassidyite

Ca2(Ni,Mg)(PO4)2•2(H2O)
Dana No: 40.02.02.04 Strunz No: 08.CG.05
Locality:

 

Notes:

 

 
   
 


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