Howardevansite
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About Howardevansite
Formula:
NaCuFe2(VO4)3
Colour:
Black
Lustre:
Metallic
Specific Gravity:
3.814 (Calculated)
Crystal System:
Triclinic
Member of:
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.
Type Locality:
Classification of Howardevansite
Approved
Approval year:
1987
First published:
1988
7/A.10-30
8.AC.05
8 : PHOSPHATES, ARSENATES, VANADATES
A : Phosphates, etc. without additional anions, without H2O
C : With medium-sized and large cations
8 : PHOSPHATES, ARSENATES, VANADATES
A : Phosphates, etc. without additional anions, without H2O
C : With medium-sized and large cations
38.5.3.1
38 : ANHYDROUS NORMAL PHOSPHATES, ARSENATES, AND VANADATES
5 : Miscellaneous
38 : ANHYDROUS NORMAL PHOSPHATES, ARSENATES, AND VANADATES
5 : Miscellaneous
21.1.5
21 : Vanadates (and vanadates with arsenate or phosphate)
1 : Vanadates of the alkalis and Cu
21 : Vanadates (and vanadates with arsenate or phosphate)
1 : Vanadates of the alkalis and Cu
Physical Properties of Howardevansite
Optical Data of Howardevansite
Type:
Biaxial
Anisotropism:
Moderate
Reflectivity:
481nm | R1=15.5% | R2= 20.1% |
547nm | R1=15.0% | R2= 18.4% |
591nm | R1=14.1% | R2= 17.2% |
644nm | R1=13.5% | R2= 17.1% |
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 Howardevansite
Formula:
NaCuFe2(VO4)3
IMA Formula:
NaCu2+Fe3+2(VO4)3
Common Impurities:
Al,Mn,Ti
Crystallography of Howardevansite
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°
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.
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
---|---|---|---|---|---|---|---|
0001138 | Howardevansite | Hughes J M, Drexler J W, Campana C F, Malinconico M L (1988) Howardevansite, NaCuFe2(VO4)3, a new fumarolic sublimate from Izalco volcano, El Salvador: Descriptive mineralogy and crystal structure American Mineralogist 73 181-186 | ![]() | 1988 | 0 | 293 |
CIF Raw Data - click here to close
Type Occurrence of Howardevansite
Place of Conservation of Type Material:
Harvard University, Cambridge, Massachusetts, 130752.
National Museum of Natural History, Washington, D.C., USA, 165494.
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:
Synonyms of Howardevansite
Other Language Names for Howardevansite
Relationship of Howardevansite to other Species
Member of:
Other Members of this group:
Grigorievite | Cu3Fe3+2Al2(VO4)6 | Tric. 1 : P1 |
Koksharovite | CaMg2Fe3+4(VO4)6 | Tric. 1 : P1 |
Ziminaite | Fe3+6 (VO4)6 | Tric. 1 : P1 |
Common Associates
Lyonsite | Cu3Fe4(VO4)6 |
Thénardite | Na2SO4 |
Related Minerals - Nickel-Strunz Grouping
8.AC. | Angarfite | NaFe3+5(PO4)4(OH)4 · 4H2O | Orth. 2 2 2 : C2 2 21 |
8.AC. | Wopmayite | Ca6Na3◻Mn(PO4)3(PO3OH)4 | Trig. 3m : R3c |
8.AC.X | Dyrnaesite-(La) | Na8Ce4+(La,REE)2(PO4)6 | Orth. mmm (2/m 2/m 2/m) : Pnma |
8.AC. | Edtollite | K2NaCu5Fe3+O2(AsO4)4 | Tric. 1 : P1 |
8.AC. | Alumoedtollite | K2NaCu5AlO2(AsO4)4 | Tric. 1 : P1 |
8.AC.10 | Alluaudite | (Na,Ca)Mn2+(Fe3+,Mn2+,Fe2+,Mg)2(PO4)3 | Mon. |
8.AC.10 | Arseniopleite | NaCaMnMn2(AsO4)3 | Mon. 2/m |
8.AC.10 | Caryinite | (Na,Pb)(Ca,Na)CaMn2+2(AsO4)3 | Mon. 2/m |
8.AC.10 | Ferroalluaudite | (Na,Ca)Fe2+(Fe3+,Mn2+,Fe2+)2(PO4)3 | Mon. 2/m : B2/b |
8.AC.10 | Hagendorfite | NaCaMn2+Fe2+2(PO4)3 | Mon. 2/m : B2/b |
8.AC.10 | Johillerite | Na(Mg,Zn)3Cu(AsO4)3 | Mon. 2/m : B2/b |
8.AC.10 | Maghagendorfite | (Na,◻)MgMn2+(Fe2+,Fe3+)2(PO4)3 | Mon. |
8.AC.10 | Nickenichite | Na0.8Ca0.4Cu0.4(Mg,Fe)3(AsO4)3 | Mon. 2/m : B2/b |
8.AC.10 | Varulite | NaCaMn2+Mn2+2(PO4)3 | Mon. 2/m : B2/b |
8.AC.10 | Ferrohagendorfite | NaCaFe2+Fe2+2(PO4)3 | Mon. |
8.AC.10 | Bradaczekite | NaCu4(AsO4)3 | Mon. 2/m : B2/b |
8.AC.10 | Yazganite | NaFe3+2(Mg,Mn2+)(AsO4)3 · H2O | Mon. 2/m : B2/b |
8.AC.10 | Groatite | NaCaMn2(PO4)[PO3(OH)]2 | Mon. 2/m : B2/b |
8.AC.15 | Bobfergusonite | Na2Mn5FeAl(PO4)6 | Mon. 2/m : P2/b |
8.AC.15 | Ferrowyllieite | (Na,Ca,Mn)(Fe,Mn)(Fe,Fe,Mg)Al(PO4)3 | Mon. 2/m : P21/b |
8.AC.15 | Qingheiite | NaMn3+Mg(Al,Fe3+)(PO4)3 | Mon. 2/m : P21/b |
8.AC.15 | Rosemaryite | (Na,Ca,Mn)(Mn,Fe2+)(Fe3+,Mg)Al(PO4)3 | Mon. 2/m : P21/b |
8.AC.15 | Wyllieite | (Na,Ca,Mn)(Mn,Fe)(Fe,Mg)Al(PO4)3 | Mon. 2/m |
8.AC.15 | Ferrorosemaryite | ◻NaFe2+Fe3+Al(PO4)3 | Mon. |
8.AC.15 | Qingheiite-(Fe2+) | Na2Fe2+MgAl(PO4)3 | Mon. 2/m : P21/m |
8.AC.18 | Manitobaite | Na16Mn2+25Al8(PO4)30 | Mon. m : Pb |
8.AC.20 | Marićite | NaFe2+(PO4) | Orth. mmm (2/m 2/m 2/m) : Pmna |
8.AC.25 | Berzeliite | (NaCa2)Mg2(AsO4)3 | Iso. m3m (4/m 3 2/m) : Ia3d |
8.AC.25 | Manganberzeliite | (NaCa2)Mn2+2(AsO4)3 | Iso. m3m (4/m 3 2/m) : Ia3d |
8.AC.25 | Palenzonaite | (NaCa2)Mn2+2(VO4)3 | Iso. m3m (4/m 3 2/m) : Ia3d |
8.AC.25 | Schäferite | (NaCa2)Mg2(VO4)3 | Iso. |
8.AC.30 | Brianite | Na2CaMg(PO4)2 | Mon. 2/m : P21/b |
8.AC.35 | Vitusite-(Ce) | Na3(Ce,La,Nd)(PO4)2 | Orth. mm2 : Pca21 |
8.AC.40 | Olgite | (Sr,Ba)(Na,Sr,REE)2Na(PO4)2 | Trig. 3m (3 2/m) : P3m1 |
8.AC.40 | Bario-olgite | (Ba,Sr)(Na,Sr,REE)2Na(PO4)2 · | Trig. 3 : P3 |
8.AC.45 | Strontiowhitlockite | Sr9Mg(PO4)6(PO3OH) | Trig. 3m : R3c |
8.AC.45 | Whitlockite | Ca9Mg(PO4)6(PO3OH) | Trig. 3m : R3c |
8.AC.45 | Merrillite | Ca9NaMg(PO4)7 | Trig. 3m : R3m |
8.AC.45 | Tuite | Ca3(PO4)2 | Trig. 3m (3 2/m) : R3m |
8.AC.45 | Ferromerrillite | Ca9NaFe2+(PO4)7 | Trig. 3m : R3c |
8.AC.50 | Chladniite | Na3CaMg11(PO4)9 | Trig. 3 : R3 |
8.AC.50 | Fillowite | Na3CaMn2+11(PO4)9 | Trig. 3 : R3 |
8.AC.50 | Johnsomervilleite | Na3CaFe11(PO4)9 | Trig. |
8.AC.50 | Galileiite | Na3Fe2+Fe2+11(PO4)9 | Trig. 3 : R3 |
8.AC.50 | Stornesite-(Y) | {(Y, Ca)}{Na6◻2}{(Ca,Na)8}{(Mg,Fe2+)43}(PO4)36 | Trig. 3 : R3 |
8.AC.50 | Xenophyllite | Na4Fe2+7(PO4)6 | Tric. 1 : P1 |
8.AC.55 | Harrisonite | Ca(Fe2+,Mg)6(PO4)2(SiO4)2 | Trig. |
8.AC.60 | Kosnarite | KZr2(PO4)3 | Trig. 3m (3 2/m) : R3c |
8.AC.65 | Panethite | (Na,Ca)2(Mg,Fe2+)2(PO4)2 | Mon. 2/m : P21/b |
8.AC.70 | Stanfieldite | Ca4Mg5(PO4)6 | Mon. |
8.AC.75 | Ronneburgite | K2MnV4O12 | Mon. 2/m |
8.AC.80 | Tillmannsite | Ag3Hg[(V,As)O4] | Tet. 4 : I4 |
8.AC.85 | Filatovite | K(Al,Zn)2(As,Si)2O8 | Mon. 2/m |
Related Minerals - Hey's Chemical Index of Minerals Grouping
21.1.1 | Metamunirite | NaVO3 | Orth. |
21.1.2 | Munirite | NaVO3 · 1.9H2O | Mon. |
21.1.3 | Barnesite | (Na,Ca)V6O16 · 3H2O | Mon. 2/m : P2/m |
21.1.4 | Bannermanite | (Na,K)0.7V4+0.7V5+5.3O15 | Mon. 2/m : B2/m |
21.1.6 | Huemulite | Na4Mg(V10O28) · 24H2O | Tric. |
21.1.7 | Blossite | α-Cu2(V2O7) | Orth. mm2 : Fdd2 |
21.1.8 | Ziesite | β-Cu2(V2O7) | Mon. |
21.1.9 | Stoiberite | Cu5(VO4)2O2 | Mon. |
21.1.10 | Mcbirneyite | Cu3(VO4)2 | Tric. 1 : P1 |
21.1.11 | Fingerite | Cu11(VO4)6O2 | Tric. 1 : P1 |
21.1.12 | Volborthite | Cu3(V2O7)(OH)2 · 2H2O | Mon. 2/m : B2/m |
21.1.13 | Tangeite | CaCu(VO4)(OH) | Orth. 2 2 2 : P21 21 21 |
21.1.14 | Vésigniéite | BaCu3(VO4)2(OH)2 | Mon. 2/m : B2/m |
21.1.15 | Lyonsite | Cu3Fe4(VO4)6 | Orth. |
Other Information
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 Howardevansite
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 Howardevansite
mindat.org URL:
https://www.mindat.org/min-1934.html
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External Links:
Mineral Dealers:
Localities for Howardevansite
Locality List




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