Mineralogy Database

Mccrillisite Mineral Data

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General Mccrillisite Information

Help on Chemical  Formula: Chemical Formula: NaCs(Be,Li)Zr2(PO4)4•1-2(H2O)
Help on Composition: Composition: Molecular Weight = 753.75 gm
   Cesium      17.63 %  Cs   18.69 % Cs2O
   Sodium       3.05 %  Na    4.11 % Na2O
   Lithium      0.23 %  Li    0.50 % Li2O
   Zirconium   24.21 %  Zr   32.70 % ZrO2
   Beryllium    0.90 %  Be    2.49 % BeO
   Phosphorus  16.44 %  P    37.66 % P2O5
   Hydrogen     0.40 %  H     3.59 % H2O
   Oxygen      37.15 %  O
              ______        ______ 
              100.00 %       99.73 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: NaCsBe0.75Li0.25Zr2(PO4)4•1.5(H2O)
Help on Environment: Environment: It occurs in open cavities up to several centimeters across and formed as a result of late-stage hydrothermal alteration of earlier formed Zr-bearing minerals.
Help on IMA Status: IMA Status: Approved IMA 1992
Help on Locality: Locality: Mount Mica granite pegmatite, South Paris, Oxford County, Maine, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: In honor of the late Dean McCrillis and his son, Philip.
Help on Name Pronunciation: Name Pronunciation: Mccrillisite + Pronunciation Say MCCRILLISITE
Help on Synonym: Synonym: IMA1991-023

Mccrillisite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:2.62893
Help on Cell Dimensions: Cell Dimensions: a = 6.573, c = 17.28, Z = 2; V = 746.57 Den(Calc)= 3.35
Help on Crystal System: Crystal System: Tetragonal - Ditetragonal Dipyramidal H-M Symbol (4/m 2/m 2/m) Space Group: I 41/amd
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.06(1), 6.159(0.9), 4.326(0.8),

Physical Properties of Mccrillisite

Help on Cleavage: Cleavage: None
Help on Color: Color: Colorless, White.
Help on Density: Density: 3.12
Help on Diaphaneity: Diaphaneity: Transparent to translucent
Help on Fracture: Fracture: Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Help on Habit: Habit: Crystalline - Fine - Occurs as well-formed fine sized crystals.
Help on Hardness: Hardness: 4.5 - Between Fluorite and Apatite
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Mccrillisite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.092 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.017 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1909,KPDmeas= 0.205,KC= 0.1877
Ncalc = 1.59 - 1.63
Help on Optical Data: Optical Data: Uniaxial (+), w=1.634, e=1.645, bire=0.0110.

Calculated Properties of Mccrillisite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.14 gm/cc
note: Specific Gravity of Mccrillisite =3.35 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.03
Boson Index = 0.97
Help on Photoelectric: Photoelectric: PEMccrillisite = 105.94 barns/electron
U=PEMccrillisite x rElectron Density= 332.18 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Mccrillisite is Not Radioactive

Mccrillisite Classification

Help on  Dana Class: Dana Class: (40)Hydrated Phosphates, etc
  (40.05)with miscellaneous formulae
  (40.05.04)Gainesite Group Gainesite Na2Zr2Be(PO4)4•1-2(H2O) I 41/amd 4/m 2/m 2/m Mccrillisite NaCs(Be,Li)Zr2(PO4)4•1-2(H2O) I 41/amd 4/m 2/m 2/m Selwynite NaK(Be,Al)Zr2(PO4)4•2(H2O) I 41/amd 4/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 08.CA.20 08 - PHOSPHATES, ARSENATES, VANADATES
  08.C - Phosphates without Additional Anions, with H2O
  08.CA -With small and large/medium cations
08.CA.20 Gainesite Na2Zr2Be(PO4)4•1-2(H2O) I 41/amd 4/m 2/m 2/m
08.CA.20 Mccrillisite NaCs(Be,Li)Zr2(PO4)4•1-2(H2O) I 41/amd 4/m 2/m 2/m
08.CA.20 Selwynite NaK(Be,Al)Zr2(PO4)4•2(H2O) I 41/amd 4/m 2/m 2/m

Other Mccrillisite Information

Help on References: References: NAME( MinRec) PHYS. PROP.(Am.Min.,Vol.80,p1074,1995) OPTIC PROP.(MinRec)
Help on See Also: See Also: Links to other databases for Mccrillisite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - GeoScienceWorld
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - Mineralienatlas (Deutsch)
11 - Online Mineral Museum
12 - QUT Mineral Atlas
13 - Ruff.Info

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Dana No: Strunz No: 08.CA.20





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