Mccrillisite Mineral Data

General Mccrillisite Information

Chemical Formula:

NaCs(Be,Li)Zr2(PO4)4•1-2(H2O)

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

Empirical Formula:

NaCsBe_0.75Li_0.25Zr₂(PO₄)₄•1.5(H₂O)

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.

IMA Status:

Approved IMA 1992

Locality:

Mount Mica granite pegmatite, South Paris, Oxford County, Maine, USA. Link to MinDat.org Location Data.

Name Origin:

In honor of the late Dean McCrillis and his son, Philip.

Name Pronunciation:

Mccrillisite + Pronunciation

Synonym:

IMA1991-023

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Mccrillisite Crystallography

Axial Ratios:

a:c = 1:2.62893

Cell Dimensions:

a = 6.573, c = 17.28, Z = 2; V = 746.57 Den(Calc)= 3.35

Crystal System:

Tetragonal - Ditetragonal DipyramidalH-M Symbol (4/m 2/m 2/m) Space Group: I 4₁/amd

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.06(1), 6.159(0.9), 4.326(0.8),

Physical Properties of Mccrillisite

Cleavage:

None

Color:

Colorless, White.

Density:

3.12

Diaphaneity:

Transparent to translucent

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Habit:

Crystalline - Fine - Occurs as well-formed fine sized crystals.

Hardness:

4.5 - Between Fluorite and Apatite

Luminescence:

Non-fluorescent.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Mccrillisite

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

Optical Data:

Uniaxial (+), w=1.634, e=1.645, bire=0.0110.

Calculated Properties of Mccrillisite

Electron Density:

Bulk Density (Electron Density)=3.14 gm/cc
note: Specific Gravity of Mccrillisite =3.35 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_Mccrillisite= 105.94 barns/electron
U=PE_Mccrillisite x rElectron Density= 332.18 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Mccrillisite is Not Radioactive

Mccrillisite Classification

Dana Class:

40.05.04.02 (40)Hydrated Phosphates, etc

(40.05)with miscellaneous formulae

(40.05.04)Gainesite Group

40.05.04.01 Gainesite Na2Zr2Be(PO4)4•1-2(H2O) I 4₁/amd 4/m 2/m 2/m

40.05.04.02 Mccrillisite NaCs(Be,Li)Zr2(PO4)4•1-2(H2O) I 4₁/amd 4/m 2/m 2/m

40.05.04.03 Selwynite NaK(Be,Al)Zr2(PO4)4•2(H2O) I 4₁/amd 4/m 2/m 2/m

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

References:

NAME( MinRec) PHYS. PROP.(Am.Min.,Vol.80,p1074,1995) OPTIC PROP.(MinRec)

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

Mccrillisite

NaCs(Be,Li)Zr2(PO4)4•1-2(H2O)
Dana No: 40.05.04.02 Strunz No: 08.CA.20
Locality:

Notes: