Griceite Mineral Data

Griceite Mineral Data +

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General Griceite Information

Chemical Formula:

LiF

Composition:

Molecular Weight = 25.94 gm

Lithium 26.76 % Li 57.60 % Li₂O

Fluorine 73.24 % F 73.24 % F

- % F -30.84 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

LiF

Environment:

In a sodalite inclusion in nepheline syenite.

IMA Status:

Approved IMA 1989

Locality:

Proudrette quarry, Mt. St. Hilaire, Quebec, Canada. Link to MinDat.org Location Data.

Name Origin:

Named for Joel D. Grice (1946-), curator of minerals, Canadian Museum of Hature, Ottawa, Canada.

Synonym:

ICSD 62361

IMA1986-043

PDF 45-1460

Griceite Image

Images:

Griceite Villiaumite

Comments: White aggregates of griceite with pinkish villiaumite.
Location: Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry), Mt Saint-Hilaire, Rouville Co., Qu?bec, Canada. Scale: Picture size 3.5 mm.
© Thomas Witzke / Abraxas-Verlag

Griceite Crystallography

Cell Dimensions:

a = 4.027, Z = 4; V = 65.30 Den(Calc)= 2.64

Crystal System:

Isometric - HexoctahedralH-M Symbol (4/m 3 2/m) Space Group: F m3m

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

By Intensity(I/I_o): 2.01(1), 2.32(0.9), 1.424(0.5),0.822(0.1), 0.9(0.1), 0.924(0.1), 1.163(0.1), 1.213(0.1),

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
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Help on Above

Wyckoff R W G , Crystal Structures , 1 (1963) p.85-237, Second edition. Interscience Publishers, New York, New York, rocksalt structure

Physical Properties of Griceite

Cleavage:

[100] Good, [100] Good, [100] Good

Color:

Green white, Yellowish white, White.

Density:

2.62

Diaphaniety:

Translucent

Fracture:

Conchoidal - Uneven - Uneven fracture producing small, conchoidal fragments.

Habit:

Inclusions - Generally found as inclusions in other minerals.

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Hardness:

4.5 - Between Fluorite and Apatite

Luminescence:

Sometimes Fluorescent, Short UV=light yellow.

Luster:

Vitreous - Dull

Streak:

white

Optical Properties of Griceite

Gladstone-Dale:

CI meas= 0.292 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.297 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1485,KPDmeas= 0.1496,KC= 0.2113

Optical Data:

Isotropic, n=1.392.

Calculated Properties of Griceite

Electron Density:

r_electron=2.42 gm/cc
note: r_Griceite=2.62 gm/cc.

Fermion Index

Fermion Index = 0.02006
Boson Index = 0.97994

Photoelectric:

PE_Griceite= 0.51 barns/electron
U=PE_Griceite x r_electron= 1.25 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Griceite is Not Radioactive

Griceite Classification

Dana Class:

9.1.1.5 (9)Anhydrous and Hydrated Halides

(9.1)where A X

(9.1.1)Dana Group

9.1.1.1 Halite NaCl F m3m 4/m 3 2/m

9.1.1.2 Sylvite KCl F m3m 4/m 3 2/m

9.1.1.3 Villiaumite NaF F m3m 4/m 3 2/m

9.1.1.4 Carobbiite KF F m3m 4/m 3 2/m

9.1.1.5 Griceite LiF F m3m 4/m 3 2/m

Strunz Class:

III/A.02-05 III - Halogenides

III/A - Simple halogenides, without water Metal : Halogen = 1 : 1

III/A.02 - Halite series Griceite - Bromargyrite

III/A.02-05 Griceite LiF F m3m 4/m 3 2/m

III/A.02-10 Villiaumite NaF F m3m 4/m 3 2/m

III/A.02-20 Carobbiite KF F m3m 4/m 3 2/m

III/A.02-30 Halite NaCl F m3m 4/m 3 2/m

III/A.02-40 Sylvite KCl F m3m 4/m 3 2/m

III/A.02-50 Chlorargyrite AgCl F m3m 4/m 3 2/m

III/A.02-60 Bromargyrite AgBr F m3m 4/m 3 2/m

Other Griceite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

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Griceite

LiF
Dana No: 9.1.1.5 Strunz No: III/A.02-05
Locality:

Notes: