Mineralogy Database

Leifite Mineral Data

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General Leifite Information

Help on Chemical  Formula: Chemical Formula: Na2(Si,Al,Be)7(O,OH,F)14
Help on Composition: Composition: Molecular Weight = 425.47 gm
   Sodium     10.81 %  Na   14.57 % Na2O
   Beryllium   1.48 %  Be    4.11 % BeO
   Aluminum   13.32 %  Al   25.16 % Al2O3
   Silicon    23.76 %  Si   50.84 % SiO2
   Hydrogen    0.76 %  H     6.77 % H2O
   Oxygen     43.62 %  O
   Fluorine    6.25 %  F     6.25 % F
                -   %   F    -2.63 % -O=F2    
             ______        ______ 
             100.00 %      105.08 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na2Si3.6Al2.1Be0.7O8.4(OH)3.2F1.4
Help on Environment: Environment: Cavities in alkali-pegmatite veins.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1915
Help on Locality: Locality: Narsarsuk, Greenland. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the tenth-century Norse mariner and explorer Leif Ericson.
Help on Name Pronunciation: Name Pronunciation: Leifite Say LEIFITE
Help on Synonym: Synonym: ICSD 2031
  PDF 27-1

Leifite Image

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Comments: Tan translucent crystal spray of leifite in syenite rock.
Location: Lovozero Massif, Kola Peninsula, Murmansk District, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

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Comments: Snow white, prismatic, crystal aggregate of leifite.
Location: Poudrette Quarry, Mont St. Hilaire, Quebec, Canada. Scale: 3x1cm.
© Tom Loomis / Dakota Matrix

Leifite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:0.3382
Help on Cell Dimensions: Cell Dimensions: a = 14.361, c = 4.857, Z = 3; V = 867.50 Den(Calc)= 2.44
Help on Crystal System: Crystal System: Trigonal - Hexagonal Scalenohedral H-M Symbol (3 2/m) Space Group: P 3m1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.151(1), 3.375(0.7), 4.698(0.4),

Physical Properties of Leifite

Help on Cleavage: Cleavage: {???} Good, {???} Good
Help on Color: Color: Colorless, White.
Help on Density: Density: 2.57
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Habit: Habit: Pseudo Hexagonal - Crystals show a hexagonal outline.
Help on Hardness: Hardness: 6 - Orthoclase
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Leifite

Help on Optical Data: Optical Data: Uniaxial (+), w=1.5117, e=1.5224, bire=0.0107.

Calculated Properties of Leifite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.42 gm/cc
note: Specific Gravity of Leifite =2.44 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PELeifite = 1.51 barns/electron
U=PELeifite x rElectron Density= 3.66 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Leifite is Not Radioactive

Leifite Classification

Help on  Dana Class: Dana Class: (78)Unclassified silicates
  (78.07)wholly unclassified silicates
  (78.07.10)Dana Group Leifite Na2(Si,Al,Be)7(O,OH,F)14 P 3m1 3 2/m Telyushenkoite! CsNa6[Be2(Si,Al)18O39F2] P 3m1 3 2/m Eirikite! KNa6Be2(Si15Al3)O39F2 P 3m1 3 2/m
Help on  Strunz Class: Strunz Class: 09.EH.25 09 - SILICATES (Germanates)
  09.E - Phyllosilicates
  09.EH -Transitional structures between phyllosilicate and other silicate units
09.EH.25 Leifite Na2(Si,Al,Be)7(O,OH,F)14 P 3m1 3 2/m
09.EH.25 Telyushenkoite! CsNa6[Be2(Si,Al)18O39F2] P 3m1 3 2/m
09.EH.25 Eirikite! KNa6Be2(Si15Al3)O39F2 P 3m1 3 2/m

Other Leifite Information

Help on References: References: NAME( Ford32) PHYS. PROP.(AmMin, Vol 88, p 255) OPTIC PROP.(Ford32)
Help on See Also: 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

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Dana No: Strunz No: 09.EH.25





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