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Lyonsite Mineral Data
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General Lyonsite Information
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 Chemical Formula: |
Cu++3Fe+++4(VO4)6 |
| Composition: |
Molecular Weight = 1,103.66 gm |
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Vanadium 27.69 % V 49.44 % V2O5 |
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Iron 20.24 % Fe 28.94 % Fe2O3 |
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Copper 17.27 % Cu 21.62 % CuO |
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Oxygen 34.79 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
| Empirical Formula: |
Cu3Fe3+4(VO4)6 |
| Environment: |
I summit crator fumaroles, as a sublimate formed at <=800 Deg. C. |
| IMA Status: |
Approved IMA 1987 |
| Locality: |
Izalco volcano, El Salvador. Link to MinDat.org Location Data. |
| Name Origin: |
Named for John Bartholomew Lyons (1916-1998), Professor of Mineralogy, Dartmouth College, Hanover, New Hampshire, USA. |
| Name Pronunciation: |
Lyonsite  |
| Synonym: |
ICSD 202361 |
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PDF 40-1456 |
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Lyonsite Image |
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Images:
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Lyonsite
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 |
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Lyonsite Crystallography
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| Axial Ratios: |
a:b:c =0.5983:1:0.2853 |
| Cell Dimensions: |
a = 10.296, b = 17.207, c = 4.91, Z = 2; V = 869.87 Den(Calc)= 4.21 |
| Crystal System: |
Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pmcn |
| X Ray Diffraction: |
By Intensity(I/Io): 3.279(1), 2.526(0.6), 4.423(0.4), |
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Physical Properties of Lyonsite
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| Cleavage: |
{001} Good |
| Color: |
Black. |
| Diaphaneity: |
Opaque |
| Fracture: |
Brittle - Generally displayed by glasses and most non-metallic minerals. |
| Habit: |
Euhedral Crystals - Occurs as well-formed crystals showing good external form. |
| Habit: |
Lath - Shaped like a small, thin plaster lath, tabular (rectangular) in shape. |
| Luster: |
Metallic |
| Streak: |
dark gray |
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Optical Properties of Lyonsite
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| Optical Data: |
NCalc= 2.25 - from Gladstone-Dale relationship (KC = 0.296) where Ncalc=Dcalc*KC+1
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| RL Anisotrophism: |
Weak. |
| RL Color: |
Creamy white. |
| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Lyonsite in Air
| λ |
R1 |
R2 |
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∑ R1(λ) |
∑ R2(λ) |
| 481 nm |
17.50 |
23.10 |
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| 547 nm |
16.60 |
22.30 |
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| 591 nm |
14.70 |
20.70 |
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| 644 nm |
14.40 |
18.80 |
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Calculated Relative Intensity Colors of Lyonsite in Air
Relative
Intensity |
0% |
60% |
100% |
120% |
180% |
240% |
300% |
360% |
420% |
480% |
540% |
590% |
| R1 |
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| R2 |
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Calculated Properties of Lyonsite
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| Electron Density: |
Bulk Density (Electron Density)=3.97 gm/cc
note: Specific Gravity of Lyonsite =4.21 gm/cc.
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| Fermion Index: |
Fermion Index = 0.0051503707
Boson Index = 0.9948496293 |
| Photoelectric: |
PELyonsite = 19.32 barns/electron
U=PELyonsite x rElectron Density= 76.81 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Lyonsite is Not Radioactive |
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Lyonsite Classification
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| Dana Class: |
38.05.02.01 (38)Anhydrous Phosphates, etc |
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(38.05)with miscellaneous formulae |
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(38.05.02)Dana Group |
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38.05.02.01 Lyonsite Cu3Fe4(VO4)6 Pmcn 2/m 2/m 2/m |
| Strunz Class: |
08.AB.40 08 - PHOSPHATES, ARSENATES, VANADATES |
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08.A - Phosphates, etc. without additional anions, without H2O |
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08.AB -With medium-sized cations |
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08.AB.40 Lyonsite Cu3Fe4(VO4)6 Pmcn 2/m 2/m 2/m |
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Other Lyonsite Information
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| References: |
NAME( AntBidBlaNic4) PHYS. PROP.(Am.Min.,Vol.72,p1000-1005,1987) OPTIC PROP.(AntBidBlaNic4) |
| 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
15 - WWW-MINCRYST
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Print or Cut-and-Paste your Lyonsite Specimen Label here :
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Lyonsite
Cu++3Fe+++4(VO4)6
Dana No: 38.05.02.01 Strunz No: 08.AB.40
Locality:
Notes:
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