Eucryptite Mineral Data (original) (raw)

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:

In lithium-rich pegmatites. Secondary mineral derived from spodumene.

IMA Status:

Valid Species (Pre-IMA) 1880

Locality:

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

Name Origin:

Named from the Greek for well and concealed, in reference to its occurrence as intimate intergrowths with albite.

Name Pronunciation:

Eucryptite + Pronunciation

Synonym:

ICSD 30982

PDF 14-667

Eucryptite Image

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/Io): 3.362(1), 3.965(0.9), 2.733(0.7),

Crystal Structure:

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

| | 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

Diaphaneity:

Transparent to translucent

Fracture:

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

Hardness:

6.5 - Pyrite

Luminescence:

Fluorescent, Short UV=pink, Long UV=pink.

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
Ncalc = 1.58 - 1.59

Optical Data:

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

Calculated Properties of Eucryptite

Electron Density:

Bulk Density (Electron Density)=2.62 gm/cc
note: Specific Gravity of Eucryptite =2.66 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PEEucryptite = 1.52 barns/electron
U=PEEucryptite x rElectron Density= 3.98 barns/cc.

Radioactivity:

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

Eucryptite Classification

Dana Class:

51.01.01.03 (51)Nesosilicate Insular SiO4 Groups Only

(51.01)with cations in [4] coordination

(51.01.01)Phenakite group

51.01.01.01 Phenakite Be2SiO4 R 3 3

51.01.01.02 Willemite Zn2SiO4 R 3 3

51.01.01.03 Eucryptite LiAlSiO4 R 3 3

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

References:

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

Search for Eucryptite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Eucryptite :

A Bijoux Google Search for Eucryptite
Adam's Minerals Google Search for Eucryptite
Cape Minerals Google Search for Eucryptite
Dakota Matrix Minerals Google Search for Eucryptite
Excalibur Mineral Corp. Google Search for Eucryptite
Exceptional Minerals Google Search for Eucryptite
John Betts Fine Minerals Search for Eucryptite
McDougall Minerals Google Search for Eucryptite
Mineral News Website Link
Rock and Mineral Shows Google Search for Eucryptite
Weinrich Minerals, Inc. Google Search for Eucryptite

Ask about Eucryptite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Espa�ol

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

Eucryptite

LiAlSiO4
Dana No: 51.01.01.03 Strunz No: 09.AA.05
Locality:

Notes: