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![Mineralogy Database Mineralogy Database](/images/Hedyphane_Crystal.gif) |
Leifite Mineral Data
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General Leifite Information
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Chemical Formula: |
Na2(Si,Al,Be)7(O,OH,F)14 |
Composition: |
Molecular Weight = 425.47 gm |
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Sodium 10.81 % Na 14.57 % Na2O |
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Beryllium 1.48 % Be 4.11 % BeO |
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Aluminum 13.32 % Al 25.16 % Al2O3 |
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Silicon 23.76 % Si 50.84 % SiO2 |
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Hydrogen 0.76 % H 6.77 % H2O |
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Oxygen 43.62 % O |
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Fluorine 6.25 % F 6.25 % F |
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- %
F -2.63 % -O=F2 |
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______ ______ |
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100.00 % 105.08 % = TOTAL OXIDE |
Empirical Formula: |
Na2Si3.6Al2.1Be0.7O8.4(OH)3.2F1.4 |
Environment: |
Cavities in alkali-pegmatite veins. |
IMA Status: |
Valid Species (Pre-IMA) 1915 |
Locality: |
Narsarsuk, Greenland. Link to MinDat.org Location Data. |
Name Origin: |
Named for the tenth-century Norse mariner and explorer Leif Ericson. |
Name Pronunciation: |
Leifite |
Synonym: |
ICSD 2031 |
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PDF 27-1 |
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Leifite Image |
Images:
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Images:
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Leifite
Comments: Snow white, prismatic, crystal aggregate of leifite.
Location: Poudrette Quarry, Mont St. Hilaire, Quebec, Canada.
Scale: 3x1cm.
© Tom Loomis / Dakota Matrix |
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Leifite Crystallography
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Axial Ratios: |
a:c = 1:0.3382 |
Cell Dimensions: |
a = 14.361, c = 4.857, Z = 3; V = 867.50 Den(Calc)= 2.44 |
Crystal System: |
Trigonal - Hexagonal Scalenohedral H-M Symbol (3 2/m) Space Group: P 3m1 |
X Ray Diffraction: |
By Intensity(I/Io): 3.151(1), 3.375(0.7), 4.698(0.4), |
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Physical Properties of Leifite
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Cleavage: |
{???} Good, {???} Good |
Color: |
Colorless, White. |
Density: |
2.57 |
Diaphaneity: |
Transparent |
Fracture: |
Brittle - Generally displayed by glasses and most non-metallic minerals. |
Habit: |
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline). |
Habit: |
Pseudo Hexagonal - Crystals show a hexagonal outline. |
Hardness: |
6 - Orthoclase |
Luster: |
Vitreous (Glassy) |
Streak: |
white |
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Optical Properties of Leifite
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Optical Data: |
Uniaxial (+), w=1.5117, e=1.5224, bire=0.0107. |
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Calculated Properties of Leifite
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Electron Density: |
Bulk Density (Electron Density)=2.42 gm/cc note: Specific Gravity of Leifite =2.44 gm/cc. |
Fermion Index: |
Fermion Index = 0.02 Boson Index = 0.98 |
Photoelectric: |
PELeifite = 1.51 barns/electron U=PELeifite x rElectron Density= 3.66 barns/cc. |
Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Leifite is Not Radioactive |
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Leifite Classification
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Dana Class: |
78.07.10.01 (78)Unclassified silicates |
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(78.07)wholly unclassified silicates |
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(78.07.10)Dana Group |
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78.07.10.01 Leifite Na2(Si,Al,Be)7(O,OH,F)14 P 3m1 3 2/m |
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78.07.10.02 Telyushenkoite! CsNa6[Be2(Si,Al)18O39F2] P 3m1 3 2/m |
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78.07.10.03 Eirikite! KNa6Be2(Si15Al3)O39F2 P 3m1 3 2/m |
Strunz Class: |
09.EH.25 09 - SILICATES (Germanates) |
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09.E - Phyllosilicates |
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09.EH -Transitional structures between phyllosilicate and other silicate units |
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09.EH.25 Leifite Na2(Si,Al,Be)7(O,OH,F)14 P 3m1 3 2/m |
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09.EH.25 Telyushenkoite! CsNa6[Be2(Si,Al)18O39F2] P 3m1 3 2/m |
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09.EH.25 Eirikite! KNa6Be2(Si15Al3)O39F2 P 3m1 3 2/m |
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Other Leifite Information
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References: |
NAME( Ford32) PHYS. PROP.(AmMin, Vol 88, p 255) OPTIC PROP.(Ford32) |
See Also: |
Links to other databases for Leifite :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Amethyst Galleries' Mineral Gallery
5 - Athena
6 - EUROmin Project
7 - Ecole des Mines de Paris
8 - GeoScienceWorld
9 - Google Images
10 - Google Scholar
11 - Handbook of Mineralogy (MinSocAm)
12 - Handbook of Mineralogy (UofA)
13 - MinDAT
14 - Mineralienatlas (Deutsch)
15 - Online Mineral Museum
16 - QUT Mineral Atlas
17 - Ruff.Info
18 - WWW-MINCRYST
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Print or Cut-and-Paste your Leifite Specimen Label here :
Leifite
Na2(Si,Al,Be)7(O,OH,F)14
Dana No: 78.07.10.01 Strunz No: 09.EH.25
Locality:
Notes:
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