Leucite Mineral Data

Leucite Mineral Data +

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General Leucite Information

Chemical Formula:

KAlSi2O6

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

Empirical Formula:

KAl(Si₂O₆)

Environment:

Acid volcanic rocks.

IMA Status:

Valid Species (Pre-IMA) 1791

Locality:

Bearpaw Mountains., Montana, USA. Link to MinDat.org Location Data.

Name Origin:

From the Greek leukos - "white."

Synonym:

Amphigene

Leucite Image

Images:

Leucite

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

Leucite Crystallography

Axial Ratios:

a:c = 1:1.05042

Cell Dimensions:

a = 13.09, c = 13.75, Z = 16; V = 2,356.04 Den(Calc)= 2.46

Crystal System:

Tetragonal - DipyramidalH-M Symbol (4/m) Space Group: I 4₁/a

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

By Intensity(I/I_o): 3.266(1), 3.438(0.85), 5.39(0.8),

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

Cleavage:

[110] Indistinct

Color:

Colorless, Gray, Yellow gray, White.

Density:

2.47

Diaphaniety:

Translucent to transparent

Fracture:

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

Habit:

Crystalline - Coarse - Occurs as well-formed coarse sized crystals.

Hardness:

6 - Orthoclase

Luminescence:

Non-fluorescent.

Luster:

Vitreous (Glassy)

Magnetism:

Nonmagnetic

Streak:

white

Optical Properties of Leucite

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

Optical Data:

Isotropic, n=1.508-1.511.

Calculated Properties of Leucite

Electron Density:

r_electron=2.44 gm/cc
note: r_Leucite=2.47 gm/cc.

Fermion Index

Fermion Index = 0.01225
Boson Index = 0.98775

Photoelectric:

PE_Leucite= 3.14 barns/electron
U=PE_Leucite x r_electron= 7.67 barns/cc.

Radioactivity:

GRapi = 255.81 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Leucite - barely detectable

Leucite Classification

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

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

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Mason68)

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

Leucite

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

Notes: