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Howardevansite

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05777390015001663706282.jpg
Howardevansite

Izalco Volcano, Sonsonate Department, El Salvador
05777390015001663706282.jpg
Howardevansite

Izalco Volcano, Sonsonate Department, El Salvador
05777390015001663706282.jpg
Howardevansite

Izalco Volcano, Sonsonate Department, El Salvador
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About HowardevansiteHide

Formula:
NaCuFe2(VO4)3
Colour:
Black
Lustre:
Metallic
Specific Gravity:
3.814 (Calculated)
Crystal System:
Triclinic
Name:
Named by J.M. Hughes, J.W. Drexler, C.F. Campana, and M.L. Malinconico in 1987 in honour of Dr. Howard Tasker Evans, Jr. (1919(20), Panama Canal Zone - 20 January 2000, Rockville, Virginia, USA) geologist with the U.S. Geological Survey. He was principal investigator for lunar sulfide minerals brought back from the moon. He also determined the crystal structure of more than 100 minerals.
Structurally related to grigorievite and koksharovite.


Classification of HowardevansiteHide

IMA status:
Approved
Approval Year:
1987
First Published:
1988
Strunz 8th ed.:
7/A.10-30
Nickel-Strunz 10th (pending) ed.:
8.AC.05

8 : PHOSPHATES, ARSENATES, VANADATES
A : Phosphates, etc. without additional anions, without H2O
C : With medium-sized and large cations
Dana 8th ed.:
38.5.3.1

38 : ANHYDROUS NORMAL PHOSPHATES, ARSENATES, AND VANADATES
5 : Miscellaneous
Hey's CIM Ref.:
21.1.5

21 : Vanadates (and vanadates with arsenate or phosphate)
1 : Vanadates of the alkalis and Cu

Physical Properties of HowardevansiteHide

Lustre:
Metallic
Transparency:
Opaque
Colour:
Black
Streak:
Red-brown
Density:
3.814 g/cm3 (Calculated)

Optical Data of HowardevansiteHide

Type:
Biaxial
Type:
Anisotropic
Anisotropism:
Moderate
Reflectivity:
481nmR1=15.5%R2= 20.1%
547nmR1=15.0%R2= 18.4%
591nmR1=14.1%R2= 17.2%
644nmR1=13.5%R2= 17.1%

Reflectance graph
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 20.1%.
R1 shown in black, R2 shown in red
Colour in reflected light:
Medium grey

Chemical Properties of HowardevansiteHide

Formula:
NaCuFe2(VO4)3
IMA Formula:
NaCu2+Fe3+2(VO4)3
Elements listed:
Cu, Fe, Na, O, V - search for minerals with similar chemistry
Common Impurities:
Al,Mn,Ti

Crystallography of HowardevansiteHide

Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 8.198(2) Å, b = 9.773(1) Å, c = 6.651(1) Å
α = 103.82°, β = 101.99°, γ = 106.74°
Ratio:
a:b:c = 0.839 : 1 : 0.681
Unit Cell V:
473.10 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Euhedral tabular crystals to 80 microns.

Type Occurrence of HowardevansiteHide

Type Locality:
ⓘ Izalco Volcano, Sonsonate Department, El Salvador
Place of Conservation of Type Material:
Harvard University, Cambridge, Massachusetts, 130752.
National Museum of Natural History, Washington, D.C., USA, 165494.
Geological Setting of Type Material:
A sublimate from volcanic gasses.
Associated Minerals at Type Locality:
Tungstenoan WulfeniteThénardite

Synonyms of HowardevansiteHide

Other Language Names for HowardevansiteHide

Relationship of Howardevansite to other SpeciesHide

Member of:
Howardevansite Group
Other Members of this group:
GrigorieviteCu3Fe3+2Al2(VO4)6Tric. 1 : P1
KoksharoviteCaMg2Fe3+4(VO4)6Tric. 1 : P1
ZiminaiteFe3+6 (VO4)6Tric. 1 : P1

Common AssociatesHide

LyonsiteCu3Fe4(VO4)6
ThénarditeNa2SO4

Related Minerals - Nickel-Strunz GroupingHide

8.AC.WopmayiteCa6Na3□Mn(PO4)3(PO3OH)4Trig. 3m : R3c
8.AC.EdtolliteK2NaCu5Fe3+O2(AsO4)4Tric. 1 : P1
8.AC.AlumoedtolliteK2NaCu5AlO2(AsO4)4Tric. 1 : P1
8.AC.10Alluaudite(Na,Ca)Mn2+(Fe3+,Mn2+,Fe2+,Mg)2(PO4)3Mon.
8.AC.10Arseniopleite(Ca,Na)NaMn2+(Mn2+,Mg,Fe2+)2(AsO4)3Mon. 2/m : P2/b
8.AC.10Caryinite(Na,Pb)(Ca,Na)CaMn2+2(AsO4)3Mon. 2/m
8.AC.10Ferroalluaudite(Na,Ca)Fe2+(Fe3+,Mn2+,Fe2+)2(PO4)3
8.AC.10HagendorfiteNaCaMn2+Fe2+2(PO4)3Mon. 2/m : B2/b
8.AC.10JohilleriteNa(Mg,Zn)3Cu(AsO4)3Mon. 2/m : B2/b
8.AC.10Maghagendorfite(□,Na,)(Na,Ca,Fe2+)Mn(Mg,Fe2+,Fe3+)3(PO4)3Mon.
8.AC.10NickenichiteNa0.8Ca0.4Cu0.4(Mg,Fe)3(AsO4)3Mon. 2/m : B2/b
8.AC.10VaruliteNaCaMn2+Mn2+2(PO4)3Mon. 2/m : B2/b
8.AC.10FerrohagendorfiteNaCaFe2+Fe2+2(PO4)3Mon.
8.AC.10BradaczekiteNaCu4(AsO4)3Mon. 2/m : B2/b
8.AC.10YazganiteNaFe3+2(Mg,Mn2+)(AsO4)3 · H2OMon. 2/m : B2/b
8.AC.10GroatiteNaCaMn2(PO4)(HPO4)2Mon. 2/m : B2/b
8.AC.15BobfergusoniteNa2Mn5FeAl(PO4)6Mon. 2/m : P2/b
8.AC.15Ferrowyllieite(Na,Ca,Mn)(Fe,Mn)(Fe,Fe,Mg)Al(PO4)3Mon. 2/m : P21/b
8.AC.15QingheiiteNaMn3+Mg(Al,Fe3+)(PO4)3Mon. 2/m : P21/b
8.AC.15Rosemaryite(Na,Ca,Mn)(Mn,Fe2+)(Fe3+,Mg)Al(PO4)3Mon. 2/m : P21/b
8.AC.15Wyllieite(Na,Ca,Mn)(Mn,Fe)(Fe,Mg)Al(PO4)3Mon. 2/m
8.AC.15Ferrorosemaryite◻NaFe2+Fe3+Al(PO4)3Mon.
8.AC.15Qingheiite-(Fe2+)Na2Fe2+MgAl(PO4)3Mon. 2/m : P21/m
8.AC.18ManitobaiteNa16Mn2+25Al8(PO4)30Mon. m : Pb
8.AC.20MarićiteNaFe2+(PO4)Orth. mmm (2/m 2/m 2/m) : Pmna
8.AC.25Berzeliite(NaCa2)Mg2(AsO4)3Iso. m3m (4/m 3 2/m) : Ia3d
8.AC.25ManganberzeliiteNaCa2Mn2+2(AsO4)3Iso. m3m (4/m 3 2/m) : Ia3d
8.AC.25Palenzonaite(NaCa2)Mn2+2(VO4)3Iso. m3m (4/m 3 2/m) : Ia3d
8.AC.25SchäferiteCa2NaMg2(VO4)3Iso.
8.AC.30BrianiteNa2CaMg(PO4)2Mon. 2/m : P21/b
8.AC.35Vitusite-(Ce)Na3(Ce,La,Nd)(PO4)2Orth. mm2 : Pca21
8.AC.40Olgite(Sr,Ba)(Na,Sr,REE)2Na(PO4)2Trig. 3m (3 2/m) : P3m1
8.AC.40Bario-olgite(Ba,Sr)(Na,Sr,REE)2Na(PO4)2 · Trig. 3 : P3
8.AC.45StrontiowhitlockiteSr9Mg(PO4)6(HPO4)Trig. 3m : R3c
8.AC.45WhitlockiteCa9Mg(PO4)6(HPO4)Trig. 3m : R3c
8.AC.45MerrilliteCa9NaMg(PO4)7Trig. 3m : R3m
8.AC.45TuiteCa3(PO4)2Trig. 3m (3 2/m) : R3m
8.AC.45FerromerrilliteCa9NaFe2+(PO4)7Trig. 3m : R3c
8.AC.50Chladniite{Ca}{Na8}{Ca4Na4}{(Mg,Fe2+)43}(PO4)36Trig. 3 : R3
8.AC.50Fillowite{Mn2+}{Na8}{Ca4Na4}{(Mn2+,Fe2+)43}(PO4)36Trig. 3 : R3
8.AC.50JohnsomervilleiteNa10Ca6Mg18Fe25(PO4)36Trig.
8.AC.50Galileiite{Fe2+}{Na8}{Fe2+4Na4}{Fe2+43}(PO4)36Trig. 3 : R3
8.AC.50Stornesite-(Y){(Y, Ca)}{Na6◻2}{(Ca,Na)8}{(Mg,Fe2+)43}(PO4)36Trig. 3 : R3
8.AC.50XenophylliteNa4Fe2+7(PO4)6Tric. 1 : P1
8.AC.55HarrisoniteCa(Fe2+,Mg)6(PO4)2(SiO4)2Trig.
8.AC.60KosnariteKZr2(PO4)3Trig. 3m (3 2/m) : R3c
8.AC.65Panethite(Na,Ca)2(Mg,Fe2+)2(PO4)2Mon. 2/m : P21/b
8.AC.70StanfielditeCa4Mg5(PO4)6Mon.
8.AC.75RonneburgiteK2MnV4O12Mon. 2/m
8.AC.80Tillmannsite(Ag3Hg)(VO4,AsO4)Tet. 4 : I4
8.AC.85FilatoviteK(Al,Zn)2(As,Si)2O8Mon. 2/m

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

21.1.1MetamuniriteNaVO3Orth.
21.1.2MuniriteNaVO3 · 1.9H2OMon.
21.1.3Barnesite(Na,Ca)V6O16 · 3H2OMon. 2/m : P2/m
21.1.4Bannermanite(Na,K)0.7V4+0.7V5+5.3O15Mon. 2/m : B2/m
21.1.6HuemuliteNa4Mg(V10O28) · 24H2OTric.
21.1.7Blossiteα-Cu2(V2O7)Orth. mm2 : Fdd2
21.1.8Ziesiteβ-Cu2(V2O7)Mon.
21.1.9StoiberiteCu5(VO4)2O2Mon.
21.1.10McbirneyiteCu3(VO4)2Tric.
21.1.11FingeriteCu11(VO4)6O2Tric. 1 : P1
21.1.12VolborthiteCu3(V2O7)(OH)2 · 2H2OMon. 2/m : B2/m
21.1.13TangeiteCaCu(VO4)(OH)Orth. 2 2 2 : P21 21 21
21.1.14VésigniéiteBaCu3(VO4)2(OH)2Mon. 2/m : B2/m
21.1.15LyonsiteCu3Fe4(VO4)6Orth.

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for HowardevansiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Hughes, J.M., Drexler, J.W., Campana, C.F., Malinconico, M.L. (1988) Howardevansite, NaCu2+Fe3+2(VO4)3-3, a new fumarolic sublimate from Izalco volcano, El Salvador: descriptive mineralogy and crystal structure. American Mineralogist: 73: 181-186.

Internet Links for HowardevansiteHide

Localities for HowardevansiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
El Salvador (TL)
 
  • Sonsonate Department
Amer.Min.(1988) 73, 181-186
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