Lyonsite Mineral Data

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General Lyonsite Information

Chemical Formula:

Cu++3Fe+++4(VO4)6

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

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

PDF 40-1456

Lyonsite Image

Images:

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

Lyonsite Crystallography

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 - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pmcn

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.279(1), 2.526(0.6), 4.423(0.4),

Crystal Structure:

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Hughes J M , Starkey S J , Malinconico M L , Malinconico L L , American Mineralogist , 72 (1987) p.1000-1005, Lyonsite, Cu3Fe4(VO4)6, a new fumarolic sublimate from Izalco, volcano, El Salvador: Descriptive mineralogy and crystal structure

Physical Properties of Lyonsite

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

Optical Properties of Lyonsite

Optical Data:

NCalc= 2.25 - from Gladstone-Dale relationship (KC = 0.296) where Ncalc=Dcalc*KC+1

RL Anisotrophism:

Weak.

RL Color:

Creamy white.

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**
Relative Intensity	0%	60%	100%	120%	180%	240%	300%	360%	420%	480%	540%	590%
R₁
R₂

Calculated Properties of Lyonsite

Electron Density:

Bulk Density (Electron Density)=3.97 gm/cc
note: Specific Gravity of Lyonsite =4.21 gm/cc.

Fermion Index:

Fermion Index = 0.0051503707
Boson Index = 0.9948496293

Photoelectric:

PE_Lyonsite= 19.32 barns/electron
U=PE_Lyonsite x rElectron Density= 76.81 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Lyonsite is Not Radioactive

Lyonsite Classification

Dana Class:

38.05.02.01 (38)Anhydrous Phosphates, etc

(38.05)with miscellaneous formulae

(38.05.02)Dana Group

38.05.02.01 Lyonsite Cu3Fe4(VO4)6 Pmcn 2/m 2/m 2/m

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

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 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - MinMax(Deutsch)
11 - MinMax(English)
12 - Mineralienatlas (Deutsch)
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Print or Cut-and-Paste your Lyonsite Specimen Label here :

Lyonsite

Cu++3Fe+++4(VO4)6
Dana No: 38.05.02.01 Strunz No: 08.AB.40
Locality:

Notes: