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This article has been cited by other articles: ... John M. Hughes, John W. Drexler, Charles F. Campana, and MaryAnn L. Malinconico ... This record provided courtesy of AGI/GeoRef.
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It was found that the composition of the phase of the howardevansite type structure, formed in the ... and howardevansite type structure. From the data pre- ...
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Both phases with the howardevansite type structure are products of a reaction between FeVO4 and ... howardevansite type structure is formed. An interesting ...
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Hughes, Drexler, Campana, and Malinconico (1988) write that "Howardevansite, NaCuFe2(VO4)3, has been discovered in the summit crater fumaroles of Izalco volcano, El Salvador. The mineral, ... Howardevansite occurs as euhedral, black tabular crystals up to 80 microns in greatest dimension. The crystals are triclinic.
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Vanadium oxides with a general formula A3+1.5x2+M4−x3+(VO4)6 crystallize also in another structure type of howardevansite, NaCuFe2(VO4)3 [7], or Fe7(PO4)6 ...
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The compound is isotypic with mineral howardevansite, NaCuFe2(VO4)3, and crystallizes in a triclinic system (space group P Image (No. 2); a = 8.1484(5), ...
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Howardevansite - Wikipedia
La howardevansite è un minerale. Webmin Fosfati, arsenati e vanadati
it.wikipedia.org/wiki/Howardevansite |
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HUGHES ET AL.: HOWARDEVANSITE 185 sin c tootl I I I I in Chains chains howardevansite. Fig.3. Na(l)O.andNa(2)O' infinitelyin the ... In reflectedlight in air, howardevansite is medium gray, with moderate anisotropy. Reflectivity values were measured in air on a polished surface of unknown orientation, using a SiC standard.
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... Mixed valence compound, Howardevansite structure type ... β=108.35(1)°, γ=101.64(1)° at 270K and adopts the well-known howardevansite structure type. ...
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Howardevansite, NaCu2+Fe23+(VO4)33−, a new fumarolic sublimate from Izalco volcano, El Salvador: descriptive mineralogy and crystal structure ...
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