Leucite Mineral Data + Say LEUCITE

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General Leucite Information

Help on Chemical  Formula: Chemical Formula: KAlSi2O6
Help on Composition: Composition: Molecular Weight = 218.25 gm
   Potassium  17.91 %  K    21.58 % K2O
   Aluminum   12.36 %  Al   23.36 % Al2O3
   Silicon    25.74 %  Si   55.06 % SiO2
   Oxygen     43.99 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: KAl(Si2O6)
Help on Environment: Environment: Acid volcanic rocks.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1791
Help on Locality: Locality: Bearpaw Mountains., Montana, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek leukos - "white."
Help on Synonym: Synonym: Amphigene
 

Leucite Image

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Leucite

Comments: Large single crystal of dark gray leucite.
Location: Roccamonfina, Caserta Province, Campania, Italy. Scale: 20x20x20 mm.
© John Betts - Fine Minerals

Leucite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:1.05042
Help on Cell Dimensions: Cell Dimensions: a = 13.09, c = 13.75, Z = 16; V = 2,356.04 Den(Calc)= 2.46
Help on Crystal System: Crystal System: Tetragonal - DipyramidalH-M Symbol (4/m) Space Group: I 41/a
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.266(1), 3.438(0.85), 5.39(0.8),
Click Here for Large Leucite Structure Window Crystal Structure:

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Mazzi F , Galli E , Gottardi G , American Mineralogist , 61 (1976) p.108-115, The crystal structure of tetragonal leucite

View Additional jPOWD Structure files for Leucite
[1] [2] [3] [4] [5] [6] [7] [8]
 

Physical Properties of Leucite

Help on Cleavage: Cleavage: [110] Indistinct
Help on Color: Color: Colorless, Gray, Yellow gray, White.
Help on Density: Density: 2.47
Help on Diaphaniety: Diaphaniety: Translucent to transparent
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Crystalline - Coarse - Occurs as well-formed coarse sized crystals.
Help on Hardness: Hardness: 6 - Orthoclase
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous (Glassy)
Help on Magnetism: Magnetism: Nonmagnetic
Help on Streak: Streak: white
 

Optical Properties of Leucite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.006 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.01 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2072,KPDmeas= 0.2064,KC= 0.2052
Help on Optical Data: Optical Data: Isotropic, n=1.508-1.511.
 

Calculated Properties of Leucite

Help on Electron Density: Electron Density:

relectron=2.44 gm/cc
note: rLeucite =2.47 gm/cc.

Help on Fermion Index Fermion Index Fermion Index = 0.01225
Boson Index = 0.98775
Help on Photoelectric: Photoelectric:

PELeucite = 3.14 barns/electron
U=PELeucite x relectron= 7.67 barns/cc.

Help on Radioactivity: Radioactivity:

GRapi = 255.81 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Leucite - barely detectable

 

Leucite Classification

Help on  Dana Class: Dana Class: 76.2.2.1 (76)Tectosilicate Al-Si Framework
  (76.2)Feldspathoids and related species
  (76.2.2)Leucite group
 
76.2.2.1 Leucite KAlSi2O6 I 41/a 4/m
 
76.2.2.2 Ammonioleucite (NH4,K)AlSi2O6 I 41/a 4/m
Help on  Strunz Class: Strunz Class: VIII/J.05-10 VIII - Silicates
  VIII/J - Tectosilicates (network) without anions unfamiliar to the tetraheders
  VIII/J.05 - Leucite - Ammonioleucite series
 
VIII/J.05-10 Leucite KAlSi2O6 I 41/a 4/m
 
VIII/J.05-20 Ammonioleucite (NH4,K)AlSi2O6 I 41/a 4/m
 

Other Leucite Information

Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Mason68)
Help on See Also: See Also: Links to other databases for Leucite :
1 -Am. Min. Crystal Structure Database 2 - Amethyst Galleries' Mineral Gallery 3 - Applied Mineralogy 4 -Athena 5 - Crocoite.com Mineral Locations 6 - EUROmin Project 7 - Glendale Community College 8 -Google Images 9 -Google Scholar 10 -Handbook of Mineralogy (MinSocAm) 11 -Handbook of Mineralogy (UofA) 12 -MinDAT 13 -MinMax(Deutsch) 14 -MinMax(English) 15 -Mineralienatlas (Deutsch) 16 - Minerals in Thin Section-University of North Carolina 17 -Minerals in Thin Sections-Humboldt State 18 -QUT Mineral Atlas 19 - Tradeshop.com - The Rainbow of Gems 20 - UCLA - Petrography Thin-Sections 21 - WWW-MINCRYST 22 -École des Mines de Paris

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Leucite

KAlSi2O6
Dana No: 76.2.2.1 Strunz No: VIII/J.05-10
Locality:

 

Notes:

 

 
   
 
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