Mccrillisite Mineral Data

Mccrillisite Mineral Data +

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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.

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

Diaphaniety:

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

Optical Data:

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

Calculated Properties of Mccrillisite

Electron Density:

r_electron=3.14 gm/cc
note: r_Mccrillisite=3.35 gm/cc.

Fermion Index

Fermion Index = 0.03647
Boson Index = 0.96353

Photoelectric:

PE_Mccrillisite= 105.94 barns/electron
U=PE_Mccrillisite x r_electron= 332.18 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Mccrillisite is Not Radioactive

Mccrillisite Classification

Dana Class:

40.5.4.2 (40)Hydrated Phosphates, etc

(40.5)with miscellaneous formulae

(40.5.4)Dana Group

40.5.4.1 Gainesite Na2Zr2Be(PO4)4·1-2(H2O) I 4₁/amd 4/m 2/m 2/m

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

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

Strunz Class:

VII/C.02-40 VII - Phosphates, Arsenates and Vanadates

VII/C - Water-bearing phosphates without unfamiliar anions. cations of medium and small size: Be and Mn, Fe, Cu, Zn, Mg

VII/C.02 - Faheyite - Gainesite-(NaCs) series

VII/C.02-10 Faheyite (Mn,Mg)Fe2Be2(PO4)4·6(H2O) P 6₂22 6 2 2

VII/C.02-20 Melilite (Ca,Na)2(Al,Mg,Fe)(Si,Al)2O7 P 42₁m 4 2m

VII/C.02-25 Selwynite NaK(Be,Al)Zr2(PO4)4·2(H2O) I 4₁/amd 4/m 2/m 2/m

VII/C.02-35 Gainesite Na2Zr2Be(PO4)4·1-2(H2O) I 4₁/amd 4/m 2/m 2/m

VII/C.02-40 Mccrillisite NaCs(Be,Li)Zr2(PO4)4·1-2(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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas

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Mccrillisite

NaCs(Be,Li)Zr2(PO4)4·1-2(H2O)
Dana No: 40.5.4.2 Strunz No: VII/C.02-40
Locality:

Notes: