Mineralogy Database

Lyonsite Mineral Data

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General Lyonsite Information

Help on Chemical  Formula: Chemical Formula: Cu++3Fe+++4(VO4)6
Help on Composition: Composition: Molecular Weight = 1,103.66 gm
   Vanadium  27.69 %  V    49.44 % V2O5
   Iron      20.24 %  Fe   28.94 % Fe2O3
   Copper    17.27 %  Cu   21.62 % CuO
   Oxygen    34.79 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Cu3Fe3+4(VO4)6
Help on Environment: Environment: I summit crator fumaroles, as a sublimate formed at <=800 Deg. C.
Help on IMA Status: IMA Status: Approved IMA 1987
Help on Locality: Locality: Izalco volcano, El Salvador. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for John Bartholomew Lyons (1916-1998), Professor of Mineralogy, Dartmouth College, Hanover, New Hampshire, USA.
Help on Name Pronunciation: Name Pronunciation: Lyonsite Say LYONSITE
Help on Synonym: Synonym: ICSD 202361
  PDF 40-1456

Lyonsite Image

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Comments: Black, prismatic crystals of lyonsite in matrix.
Location: Ronneburg U deposit, Gera district, Thuringia, Germany. Scale: Picture size 0.8 mm.
© Thomas Witzke / Abraxas-Verlag

Lyonsite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.5983:1:0.2853
Help on Cell Dimensions: Cell Dimensions: a = 10.296, b = 17.207, c = 4.91, Z = 2; V = 869.87 Den(Calc)= 4.21
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pmcn
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.279(1), 2.526(0.6), 4.423(0.4),

Physical Properties of Lyonsite

Help on Cleavage: Cleavage: {001} Good
Help on Color: Color: Black.
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Euhedral Crystals - Occurs as well-formed crystals showing good external form.
Help on Habit: Habit: Lath - Shaped like a small, thin plaster lath, tabular (rectangular) in shape.
Help on Luster: Luster: Metallic
Help on Streak: Streak: dark gray

Optical Properties of Lyonsite

Help on Optical Data: Optical Data: NCalc= 2.25 - from Gladstone-Dale relationship (KC = 0.296) where Ncalc=Dcalc*KC+1
Help on RL Anisotrophism: RL Anisotrophism: Weak.
Help on RL Color: RL Color: Creamy white.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Lyonsite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 481 nm   17.50   23.10 
 547 nm   16.60   22.30 
 591 nm   14.70   20.70 
 644 nm   14.40   18.80 
Calculated Relative Intensity Colors of Lyonsite in Air
   0%   60% 100% 120% 180% 240% 300% 360% 420% 480% 540% 590%

Calculated Properties of Lyonsite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.97 gm/cc
note: Specific Gravity of Lyonsite =4.21 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0051503707
Boson Index = 0.9948496293
Help on Photoelectric: Photoelectric: PELyonsite = 19.32 barns/electron
U=PELyonsite x rElectron Density= 76.81 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Lyonsite is Not Radioactive

Lyonsite Classification

Help on  Dana Class: Dana Class: (38)Anhydrous Phosphates, etc
  (38.05)with miscellaneous formulae
  (38.05.02)Dana Group Lyonsite Cu3Fe4(VO4)6 Pmcn 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 08.AB.40 08 - PHOSPHATES, ARSENATES, VANADATES
  08.A - Phosphates, etc. without additional anions, without H2O
  08.AB -With medium-sized cations
08.AB.40 Lyonsite Cu3Fe4(VO4)6 Pmcn 2/m 2/m 2/m

Other Lyonsite Information

Help on References: References: NAME( AntBidBlaNic4) PHYS. PROP.(Am.Min.,Vol.72,p1000-1005,1987) OPTIC PROP.(AntBidBlaNic4)
Help on See Also: See Also: Links to other databases for Lyonsite :
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: 08.AB.40





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