Leucite Mineral Data

Leucite Mineral Data
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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 Name Pronunciation: Name Pronunciation: Leucite Say LEUCITE
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 Diaphaneity: Diaphaneity: 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
Ncalc = 1.5 - 1.51
Help on Optical Data: Optical Data: Isotropic, n=1.508-1.511.
 

Calculated Properties of Leucite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.44 gm/cc
note: Specific Gravity of Leucite =2.47 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
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)
Concentration of Leucite per GRapi unit = 0.39 (%)

Estimated Radioactivity from Leucite - barely detectable

 

Leucite Classification
Help on Dana Class: Dana Class: 76.02.02.01 (76)Tectosilicate Al-Si Framework
  (76.02)Feldspathoids and related species
  (76.02.02)Leucite group
 
76.02.02.01 Leucite KAlSi2O6 I 41/a 4/m
 
76.02.02.02 Ammonioleucite (NH4,K)AlSi2O6 I 41/a 4/m
Help on Strunz Class: Strunz Class: 09.GB.05 09 - SILICATES (Germanates)
  09.G - Tektosilicates with Zeolitic H2O
  09.GB -Chains of single connected 4-membered rings
 
09.GB.05 Ammonioleucite (NH4,K)AlSi2O6 I 41/a 4/m
 
09.GB.05 Analcime NaAlSi2O6•(H2O) P1 1
 
09.GB.05 Hsianghualite Ca3Li2Be3(SiO4)3F2 I 213 2 3
 
09.GB.05 Lithosite K6Al4Si8O25•(H2O) P 21 (pseudo ORTH) 2
 
09.GB.05 Leucite KAlSi2O6 I 41/a 4/m
 
09.GB.05 Pollucite (Cs,Na)2Al2Si4O12•(H2O) I a3d 4/m 3 2/m
 
09.GB.05 Wairakite CaAl2Si4O12•2(H2O) I2/a 2/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 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - Glendale Community College
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - MinMax(Deutsch)
13 - MinMax(English)
14 - Mineralienatlas (Deutsch)
15 - Minerals in Thin Section-University of North Carolina
16 - Minerals in Thin Sections-Humboldt State
17 - QUT Mineral Atlas
18 - Ruff.Info
19 - Tradeshop.com - The Rainbow of Gems
20 - UCLA - Petrography Thin-Sections
21 - WWW-MINCRYST

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Leucite

KAlSi2O6
Dana No: 76.02.02.01 Strunz No: 09.GB.05
Locality:

 

Notes: