Mineralogy Database

Eucryptite Mineral Data

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General Eucryptite Information

Help on Chemical  Formula: Chemical Formula: LiAlSiO4
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: LiAlSiO4
Help on Environment: Environment: In lithium-rich pegmatites. Secondary mineral derived from spodumene.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1880
Help on Locality: Locality: Branchville, Faifield Co., Connecticut, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named from the Greek for well and concealed, in reference to its occurrence as intimate intergrowths with albite.
Help on Name Pronunciation: Name Pronunciation: Eucryptite + Pronunciation Say EUCRYPTITE
Help on Synonym: Synonym: ICSD 30982
  PDF 14-667

Eucryptite Image

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

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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

Help on Axial Ratios: Axial Ratios: a:c = 1:0.66773
Help on Cell Dimensions: Cell Dimensions: a = 13.48, c = 9.001, Z = 18; V = 1,416.45 Den(Calc)= 2.66
Help on Crystal System: Crystal System: Trigonal - Rhombohedral H-M Symbol ( 3) Space Group: R 3
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.362(1), 3.965(0.9), 2.733(0.7),

Physical Properties of Eucryptite

Help on Cleavage: Cleavage: {1011} Indistinct
Help on Color: Color: Brown, Colorless, White.
Help on Density: Density: 2.67
Help on Diaphaneity: Diaphaneity: Transparent to translucent
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Hardness: Hardness: 6.5 - Pyrite
Help on Luminescence: Luminescence: Fluorescent, Short UV=pink, Long UV=pink.
Help on Luster: Luster: Vitreous (Glassy)
Help on Magnetism: Magnetism: Nonmagnetic
Help on Streak: Streak: white

Optical Properties of Eucryptite

Help on Gladstone-Dale: 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
Ncalc = 1.58 - 1.59
Help on Optical Data: Optical Data: Uniaxial (+), w=1.527, e=1.586, bire=0.0590.

Calculated Properties of Eucryptite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.62 gm/cc
note: Specific Gravity of Eucryptite =2.66 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEEucryptite = 1.52 barns/electron
U=PEEucryptite x rElectron Density= 3.98 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Eucryptite is Not Radioactive

Eucryptite Classification

Help on  Dana Class: Dana Class: (51)Nesosilicate Insular SiO4 Groups Only
  (51.01)with cations in [4] coordination
  (51.01.01)Phenakite group Phenakite Be2SiO4 R 3 3 Willemite Zn2SiO4 R 3 3 Eucryptite LiAlSiO4 R 3 3
Help on  Strunz Class: Strunz Class: 09.AA.05 09 - SILICATES (Germanates)
  09.A - Nesosilicates
  09.AA -Nesosilicates without additional anions;
09.AA.05 Eucryptite LiAlSiO4 R 3 3
09.AA.05 Phenakite Be2SiO4 R 3 3
09.AA.05 Willemite Zn2SiO4 R 3 3

Other Eucryptite Information

Help on References: References: NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Eucryptite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - GeoScienceWorld
6 - Glendale Community College
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info

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Dana No: Strunz No: 09.AA.05





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