haematite

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Related to hematites: red hematite
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Synonyms for haematite

the principal form of iron ore

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The hematite/(hematite+ goethite) ratio, Hm/(Hm + Gt), was estimated from the area ratio of the line Hm 104 or Hm 012 to the line Gt 100, and the degree of [Al.sup.3+] substitution in hematite was calculated from the d(110) spacing (SCHWERTMANN et al., 1979) in hematite, and the d(110) and d(111) spacing in goethite (SCHULZE, 1984).
The Feo/Fed ratio range from 0.01 to 0.83 but was less than 0.10 in most cases, suggesting a prevalence of crystalline forms (goethite, hematite and maghemite); also, the contents in poorly crystalline oxides --ferrihydrite, mainly-- were comparatively low (SCHWERTMANN et al., 1982).
Igualmente, plaquetas y discos de ocre y hematites, atribuidos a distintas etapas magdalenienses, se utilizaron como soportes artisticos para grabar motivos geometricos en las cuevas de La Chora y Abauntz, o representaciones figurativas de caballos en Lumentxa y Urtiaga (Aranzadi y Barandiaran, 1935; Gonzalez Echegaray et al., 1963; San Juan, 1983; Barandiaran, 1973; Utrilla, 1982).
Profundizar en la comprension de las tecnologias desarrolladas para la realizacion de las numerosas manifestaciones de pinturas rupestres conocidas, creaciones artisticas representativas de sociedades prehistoricas paleoliticas y post-paleoliticas, ha supuesto reactivar, en los ultimos anos, el interes hacia el empleo de las hematites como componentes de las materias pictoricas.
Lim-Nunez R, Gilkes RJ (1987) Acid dissolution of synthetic metal-containing goethites and hematites. In 'Proceedings of the International Clay Conference'.
Preparation and properties of M-substituted hematites. Clays and Clay Minerals 27, 105-112.
Hematite ([alpha]-[Fe.sub.2][O.sub.3]) is the oldest known iron oxide mineral and is widely applied in catalysts, gas sensors, pigments, and promising photoanodes for solar cells [1-4].
Each hematite ellipsoid is 500 nm and 120 nm in major and short axis, respectively (seen from Figure 2(a)).
(1991) confirmed that hematite and goethite are the only iron oxides actually occurring in the clay fraction of a soil developed on this lithology; no ferrimagnetic mineral was detected.
In addition, laboratory tests were conducted to test the hypothesis that the direct reduction of hematite to magnetite occurs in this pedoenvironment, through burning in the presence of a carbon source.
Calculated Al substitution in hematites from non-magnetic nodules is mainly between 0.08 and 0.17 Al/(Fe + A1) mol [mol.sup.-1].
Maghemite, hematite, and quartz are the main mineral phases in magnetic nodules (Table 3).
2002), there is no relation to the presence of this tephra-derived material in soils of Sao Paulo State, Brazil (de Oliveira 1999), whose clay mineralogy is dominated mainly by kaolinite, gibbsite, hematite, and goethite, with traces of other minerals (Schwertmann and Herbillon 1992).
Hematite is commonly found in nature and can also be produced synthetically in the macrocrystalline and nanocrystalline state.
When it comes to the common iron-oxide species hematite, collectors everywhere seem to reserve their highest respect for the crystal-aggregate habit known as the "iron rose" (German: Eisenrose), the finest examples of which come from Alpine-cleft occurrences, most of them in Switzerland.