Lyonsite Mineral Data

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:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

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 - 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

Search for Lyonsite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Lyonsite :

A Bijoux Google Search for Lyonsite
Adam's Minerals Google Search for Lyonsite
Cape Minerals Google Search for Lyonsite
Dakota Matrix Minerals Google Search for Lyonsite
Excalibur Mineral Corp. Google Search for Lyonsite
Exceptional Minerals Google Search for Lyonsite
John Betts Fine Minerals Search for Lyonsite
McDougall Minerals Google Search for Lyonsite
Mineral News Website Link
Rock and Mineral Shows Google Search for Lyonsite
Weinrich Minerals, Inc. Google Search for Lyonsite

Ask about Lyonsite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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: