Leucite Mineral Data + 
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- 76.2.2.1 Leucite KAlSi2O6 I 41/a 4/m
- 76.2.2.2 Ammonioleucite (NH4,K)AlSi2O6 I 41/a 4/m
- VIII/J.05-10 Leucite KAlSi2O6 I 41/a 4/m
- VIII/J.05-20 Ammonioleucite (NH4,K)AlSi2O6 I 41/a 4/m
General Leucite Information |
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 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 | |||
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Images:
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Leucite Crystallography |
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| 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 | ||
| X Ray Diffraction: |
By Intensity(I/Io): 3.266(1), 3.438(0.85), 5.39(0.8), | ||
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Crystal Structure:
Mouse |
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Physical Properties of Leucite |
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| 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 |
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| 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 |
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| Optical Data: |
Isotropic, n=1.508-1.511. | ||
Calculated Properties of Leucite |
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| Electron Density: |
relectron=2.44 gm/cc |
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| Fermion Index |
Fermion Index = 0.01225 Boson Index = 0.98775 |
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| Photoelectric: |
PELeucite = 3.14 barns/electron |
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| Radioactivity: |
GRapi = 255.81 (Gamma Ray American Petroleum Institute Units) Estimated Radioactivity from Leucite |
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Leucite Classification |
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| Dana Class: |
76.2.2.1 (76)Tectosilicate Al-Si Framework | ||
| (76.2)Feldspathoids and related species | |||
| (76.2.2)Leucite group | |||
| Strunz Class: |
VIII/J.05-10 VIII - Silicates | ||
| VIII/J - Tectosilicates (network) without anions unfamiliar to the tetraheders | |||
| VIII/J.05 - Leucite - Ammonioleucite series | |||
Other Leucite Information |
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| References: |
NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Mason68) | ||
| 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 Search for Leucite using: Visit our Advertisers for Leucite : Translate Leucite Mineral Data : Ask about Leucite here : Print or Cut-and-Paste your Leucite Specimen Label here :
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