Eucryptite Mineral Data

Eucryptite Mineral Data +

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General Eucryptite Information

Chemical Formula:

LiAlSiO4

Composition:

Molecular Weight = 126.01 gm

Lithium 5.51 % Li 11.86 % Li₂O

Aluminum 21.41 % Al 40.46 % Al₂O₃

Silicon 22.29 % Si 47.68 % SiO₂

Oxygen 50.79 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

LiAlSiO₄

Environment:

Secondary mineral derived from spodumene.

IMA Status:

Valid Species (Pre-IMA) 1880

Locality:

Branchville, Connecticut, USA. Link to MinDat.org Location Data.

Synonym:

ICSD 30982

PDF 14-667

Eucryptite Image

Images:

Eucryptite

Comments: Gray massive eucryptite.
Location: Parker Mountain, Center Strafford, Strafford County, New Hampshire, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Images:

Eucryptite

Comments: Fine grained, massive eucryptite. Fluorescent Red under SW.
Location: Midnight Owl mine, Yavapai Co., Arizona, USA. Scale: 6x4x4cm.
© Tom Loomis / Dakota Matrix

Eucryptite Crystallography

Axial Ratios:

a:c = 1:0.66773

Cell Dimensions:

a = 13.48, c = 9.001, Z = 18; V = 1,416.45 Den(Calc)= 2.66

Crystal System:

Trigonal - RhombohedralH-M Symbol ( 3) Space Group: R 3

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

By Intensity(I/I_o): 3.362(1), 3.965(0.9), 2.733(0.7),

Crystal Structure:

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Pillars W W , Peacor D R , American Mineralogist , 58 (1973) p.681-690, The crystal structure of beta eucryptite as a function of temperature, T = 23C

View Additional jPOWD Structure files for Eucryptite
[1] [2] [3] [4] [5] [6] [7]

Physical Properties of Eucryptite

Cleavage:

[1011] Indistinct

Color:

Brown, Colorless, White.

Density:

2.67

Diaphaniety:

Transparent to translucent

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Hardness:

6.5 - Pyrite

Luminescence:

Non-fluorescent.

Luster:

Vitreous (Glassy)

Magnetism:

Nonmagnetic

Streak:

white

Optical Properties of Eucryptite

Gladstone-Dale:

CI meas= 0.05 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.046 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2092,KPDmeas= 0.2084,KC= 0.2193

Optical Data:

Uniaxial (+), w=1.527, e=1.586, bire=0.0590.

Calculated Properties of Eucryptite

Electron Density:

r_electron=2.62 gm/cc
note: r_Eucryptite=2.66 gm/cc.

Fermion Index

Fermion Index = 0.01478
Boson Index = 0.98522

Photoelectric:

PE_Eucryptite= 1.52 barns/electron
U=PE_Eucryptite x r_electron= 3.98 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Eucryptite is Not Radioactive

Eucryptite Classification

Dana Class:

51.1.1.3 (51)Nesosilicate Insular SiO4 Groups Only

(51.1)with cations in [4] coordination

(51.1.1)Phenakite group

51.1.1.1 Phenakite Be2SiO4 R 3 3

51.1.1.2 Willemite Zn2SiO4 R 3 3

51.1.1.3 Eucryptite LiAlSiO4 R 3 3

Strunz Class:

VIII/A.01-30 VIII - Silicates

VIII/A - Nesosilicates, with [SiO4]4- groups, cations of tetrahedric orientation [4]

VIII/A.01 - Phenakite series

VIII/A.01-10 Phenakite Be2SiO4 R 3 3

VIII/A.01-20 Willemite Zn2SiO4 R 3 3

VIII/A.01-30 Eucryptite LiAlSiO4 R 3 3

Other Eucryptite Information

References:

NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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

Eucryptite

LiAlSiO4
Dana No: 51.1.1.3 Strunz No: VIII/A.01-30
Locality:

Notes: