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Virgilite Mineral Data

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General Virgilite Information

Help on Chemical  Formula: Chemical Formula: LixAlxSi3-xO6
Help on Composition: Composition: Molecular Weight = 183.17 gm
   Lithium    1.89 %  Li    4.08 % Li2O
   Aluminum   7.37 %  Al   13.92 % Al2O3
   Silicon   38.33 %  Si   82.01 % SiO2
   Oxygen    52.41 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Li0.5Al0.5Si2.5O6
Help on Environment: Environment: As inclusions in stream cobbles of peraluminous volcanic glass.
Help on IMA Status: IMA Status: Approved IMA 1978
Help on Locality: Locality: From near Macusani, Puno Department, Peru. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Virgil Everett Barnes (1903-), University of Texas, Austin, Texas, USA, prominent worker on tektites, impactites, and other natural glasses.
Help on Name Pronunciation: Name Pronunciation: Virgilite + Pronunciation Say VIRGILITE
Help on Synonym: Synonym: ICSD 69221
  PDF 31-707

Virgilite Image

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Comments: B&W image of euhedral virgilite crystal surrounded by glass containing several other virgilite crystals. Plane polarized light. AmMin v63:461.
Location: Clear pale-green glass found as stream cobbles near Macusani, Peru. Scale: Crystal Size 40 µm.
© American Mineralogist

Virgilite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:1.06274
Help on Cell Dimensions: Cell Dimensions: a = 5.132, c = 5.454, Z = 1; V = 124.40 Den(Calc)= 2.44
Help on Crystal System: Crystal System: Hexagonal - Trapezohedral H-M Symbol (6 2 2) Space Group: P 6222,P 6422
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.441(1), 1.87(0.25), 4.442(0.13),

Physical Properties of Virgilite

Help on Color: Color: Colorless.
Help on Density: Density: 2.46
Help on Diaphaneity: Diaphaneity: Transparent
Help on Habit: Habit: Inclusions - Generally found as inclusions in other minerals.
Help on Hardness: Hardness: 5.5-6 - Knife Blade-Orthoclase
Help on Streak: Streak: white

Optical Properties of Virgilite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.002 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.006 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2131,KPDmeas= 0.2114,KC= 0.2119
Ncalc = 1.52
Help on Optical Data: Optical Data: Uniaxial (-), w=1.52.

Calculated Properties of Virgilite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.44 gm/cc
note: Specific Gravity of Virgilite =2.46 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEVirgilite = 1.70 barns/electron
U=PEVirgilite x rElectron Density= 4.16 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Virgilite is Not Radioactive

Virgilite Classification

Help on  Dana Class: Dana Class: (75)Tectosilicate Si Tetrahedral Frameworks
  (75.03)with silica derivative structures
  (75.03.01)Dana Group Virgilite LixAlxSi3-xO6 P 6222,P 6422 6 2 2
Help on  Strunz Class: Strunz Class: 09.FA.15 09 - SILICATES (Germanates)
  09.F - Tektosilicates without Zeolitic H2O
  09.FA -Tektosilicates without additional non-tetrahedral anions, (Al,B):Si = 1:1
09.FA.15 Virgilite LixAlxSi3-xO6 P 6222,P 6422 6 2 2

Other Virgilite Information

Help on References: References: NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Virgilite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 09.FA.15





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