Howardevansite

Howardevansite

Izalco Volcano, Sonsonate Department, El Salvador

Howardevansite

Izalco Volcano, Sonsonate Department, El Salvador

Howardevansite

Izalco Volcano, Sonsonate Department, El Salvador

About HowardevansiteHide

Howard T. Evans, Jr.

Formula:

NaCuFe₂(VO₄)₃

Colour:

Black

Lustre:

Metallic

Specific Gravity:

3.814 (Calculated)

Crystal System:

Triclinic

Member of:

Howardevansite Group

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:

ⓘ Izalco Volcano, Sonsonate Department, El Salvador

Structurally related to grigorievite and koksharovite.

Unique IdentifiersHide

IMA Classification of HowardevansiteHide

Classification of HowardevansiteHide

Mineral SymbolsHide

Physical Properties of HowardevansiteHide

Optical Data of HowardevansiteHide

Type:

Biaxial

Anisotropism:

Moderate

Reflectivity:

Wavelength	R1	R2
481nm	15.5%	20.1%
547nm	15.0%	18.4%
591nm	14.1%	17.2%
644nm	13.5%	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

Chemistry of HowardevansiteHide

Crystallography of HowardevansiteHide

Crystal StructureHide

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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 closedata_global _chemical_name_mineral 'Howardevansite' loop_ _publ_author_name 'Hughes J M' 'Drexler J W' 'Campana C F' 'Malinconico M L' _journal_name_full 'American Mineralogist' _journal_volume 73 _journal_year 1988 _journal_page_first 181 _journal_page_last 186 _publ_section_title ; 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 ; _database_code_amcsd 0001138 _chemical_formula_sum 'Cu2 Fe4 V6 Na2 O24' _cell_length_a 8.198 _cell_length_b 9.773 _cell_length_c 6.6510 _cell_angle_alpha 103.82 _cell_angle_beta 101.99 _cell_angle_gamma 106.74 _cell_volume 473.098 _exptl_crystal_density_diffrn 3.812 _symmetry_space_group_name_H-M 'P -1' loop_ _space_group_symop_operation_xyz 'x,y,z' '-x,-y,-z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z _atom_site_occupancy Cu 0.78675 0.79562 0.77650 1.00000 Fe1 0.54817 0.39238 0.11910 1.00000 Fe2 0.29616 0.98522 0.45530 1.00000 V1 0.41010 0.66723 0.38930 1.00000 V2 0.83830 0.73926 0.27550 1.00000 V3 0.77100 0.12589 0.09130 1.00000 Na1 0.00000 0.50000 0.50000 1.00000 Na2 0.02340 0.55090 -0.01600 0.50000 O1 0.44500 0.85700 0.42010 1.00000 O2 0.48210 0.35020 0.37130 1.00000 O3 0.80140 0.55560 0.26370 1.00000 O4 0.22010 0.16420 0.50350 1.00000 O5 0.27290 0.00750 0.15990 1.00000 O6 0.47290 0.57940 0.17010 1.00000 O7 0.72870 0.74210 0.02440 1.00000 O8 0.05520 0.82100 0.31840 1.00000 O9 0.19810 0.58000 0.33850 1.00000 O10 0.99070 0.23650 0.18970 1.00000 O11 0.71760 0.03610 0.26740 1.00000 O12 0.65920 0.24440 0.06780 1.00000 loop_ _atom_site_aniso_label _atom_site_aniso_U_11 _atom_site_aniso_U_22 _atom_site_aniso_U_33 _atom_site_aniso_U_12 _atom_site_aniso_U_13 _atom_site_aniso_U_23 Cu 0.01890 0.03097 0.01387 0.01499 0.00925 0.01455 Fe1 0.01053 0.00865 0.00771 0.00488 0.00398 0.00402 Fe2 0.01053 0.00949 0.01002 0.00404 0.00375 0.00388 V1 0.00939 0.00582 0.00674 0.00337 0.00340 0.00263 V2 0.00825 0.00741 0.00578 0.00337 0.00340 0.00249 V3 0.00825 0.00773 0.00559 0.00387 0.00351 0.00319 Na1 0.00740 0.12516 0.09901 0.03873 0.03372 0.11278 Na2 0.02533 0.05182 0.01599 0.02189 -0.00808 -0.00970 O1 0.00626 0.00678 0.01136 0.00421 0.00234 0.00194 O2 0.01366 0.01355 0.00944 0.00371 0.00468 0.00623 O3 0.01594 0.01315 0.01657 0.00707 0.00702 0.00623 O4 0.01736 0.01435 0.00771 0.01044 0.00702 0.00707 O5 0.01935 0.01594 0.00867 0.00960 0.00585 0.00762 O6 0.01907 0.00797 0.00616 0.00657 0.00468 0.00319 O7 0.01594 0.01555 0.01040 0.00792 0.00585 0.00651 O8 0.01138 0.01594 0.01541 -0.00101 0.00468 0.00416 O9 0.01053 0.01594 0.03082 0.00185 0.00000 0.00693 O10 0.01110 0.02431 0.01541 0.00135 0.00117 0.00693 O11 0.02248 0.01754 0.00809 0.00640 0.00702 0.00610 O12 0.01850 0.01674 0.01425 0.01213 0.00351 0.00277

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Type Occurrence of HowardevansiteHide

Synonyms of HowardevansiteHide

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Relationship of Howardevansite to other SpeciesHide

Related Minerals - Strunz-mindat GroupingHide

Other InformationHide

Internet Links for HowardevansiteHide

References 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 references and 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.

El Salvador (TL)
Sonsonate Department ⓘ Izalco Volcano (TL)	Hughes et al. (1988)