Howardevansite Mineral Data

[Newest Minerals] [Mineral Auctions] [Mineral Gallery]
The Mineral Gallery's Exceptional Specimens and Mineral Hall of Fame
Visa, PayPal, and Mastercard are Welcomed

General Howardevansite Information

Chemical Formula:

NaCu++Fe+++2(VO4)3

Composition:

Molecular Weight = 543.05 gm

Sodium 4.23 % Na 5.71 % Na₂O

Vanadium 28.14 % V 50.24 % V₂O₅

Iron 20.57 % Fe 29.41 % Fe₂O₃

Copper 11.70 % Cu 14.65 % CuO

Oxygen 35.35 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

NaCuFe³⁺₂(VO₄)₃

Environment:

Forms by sublimation around furaroles on an andesitic volcano.

IMA Status:

Approved IMA 1988

Locality:

Izalco volcano, El Salvador. Link to MinDat.org Location Data.

Name Origin:

Named for Howard Tasker Evans, Jr. (1919-2000), American mineralogist and crystallographer, U.S.G.S., Reston, Virginia, USA.

Name Pronunciation:

Howardevansite + Pronunciation

Synonym:

ICSD 202529

PDF 42-1333

Search for Howardevansite Images

Images:

Image not yet available on Webmineral.com

Try searching images.google.com or Mindat Picture Gallary for mineral pictures. Caution: The images retrieved may not be appropriate.

Howardevansite Crystallography

Axial Ratios:

a:b:c =0.8388:1:0.6805

Cell Dimensions:

a = 8.198, b = 9.773, c = 6.651, Z = 2; alpha = 103.82°, beta = 101.99°, gamma = 106.74° V = 484.71 Den(Calc)= 3.72

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

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

By Intensity(I/I_o): 3.093(1), 3.167(1), 1.659(0.7),

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 , Drexler J W , Campana C F , Malinconico M L , American Mineralogist , 73 (1988) p.181-186, Howardevansite, NaCuFe2(VO4)3, a new fumarolic sublimate from, Izalco volcano, El Salvador: Descriptive mineralogy and crystal structure, Note: Displacement ellipsoid for Na1 is not positive-definite

Physical Properties of Howardevansite

Cleavage:

None

Color:

Black.

Diaphaneity:

Opaque to translucent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Tabular - Form dimensions are thin in one direction.

Luster:

Metallic

Streak:

red brown

Optical Properties of Howardevansite

Optical Data:

Biaxial (?)

NCalc= 2.14 - from Gladstone-Dale relationship (KC = 0.2992) where Ncalc=Dcalc*KC+1

RL Anisotrophism:

Moderate.

RL Color:

Medium gray.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Howardevansite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
481 nm	15.50	20.10
547 nm	15.00	18.40
591 nm	14.10	17.20
644 nm	13.50	17.10

**Calculated Relative Intensity Colors of Howardevansite in Air**
Relative Intensity	0%	70%	100%	140%	210%	280%	350%	420%	490%	560%	630%
R₁
R₂

Calculated Properties of Howardevansite

Electron Density:

Bulk Density (Electron Density)=3.61 gm/cc
note: Specific Gravity of Howardevansite =3.81 gm/cc.

Fermion Index:

Fermion Index = 0.0052336727
Boson Index = 0.9947663273

Photoelectric:

PE_{Howardevansite}= 17.05 barns/electron
U=PE_{Howardevansite} x rElectron Density= 61.50 barns/cc.

Radioactivity:

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

Howardevansite Classification

Dana Class:

38.05.03.01 (38)Anhydrous Phosphates, etc

(38.05)with miscellaneous formulae

(38.05.03)Dana Group

38.05.03.01 Howardevansite NaCuFe2(VO4)3 P1 1

Strunz Class:

08.AC.05 08 - PHOSPHATES, ARSENATES, VANADATES

08.A - Phosphates, etc. without additional anions, without H2O

08.AC -With medium-sized and large cations

08.AC.05 Howardevansite NaCuFe2(VO4)3 P1 1

Other Howardevansite Information

References:

NAME( AntBidBlaNic4) PHYS. PROP.(Am.Min.,Vol.73,p181-186,1988) OPTIC PROP.(AntBidBlaNic4)

See Also:

Links to other databases for Howardevansite :
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

Search for Howardevansite using:

[ALTAVISTA] [AOL] [All-The-Web] [HotBot] [Ixquick] [MAMMA] [MSN.COM] [Netscape] [Scirus] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Howardevansite :

AA Mineral Specimens

B & L Fine Minerals

Crystalarium.com

Dan Weinrich Fine Minerals

Dan Weinrich Auctions

Dakota Matrix

Desert Winds Gems and Minerals

John Betts Fine Minerals

Mason's Minerals

Mineral News

Mineral of the Month Club

Wrights Rock Shop

Translate Howardevansite Mineral Data :

Ask about Howardevansite 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 Howardevansite Specimen Label here :

Howardevansite

NaCu++Fe+++2(VO4)3
Dana No: 38.05.03.01 Strunz No: 08.AC.05
Locality:

Notes: