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Hematite varieties include kidney ore, martite (pseudomorphs after magnetite), iron rose and specularite (specular hematite). While these forms vary, they all have a rust-red streak. Hematite is not only harder than pure iron, but also much more brittle. The term kidney ore may be broadly used to describe botryoidal, mammillary, or reniform ...
Some of them, e.g., Pigment Red 101 and Pigment Brown 6, are approved by the US Food and Drug Administration (FDA) for use in cosmetics. Iron oxides are used as pigments in dental composites alongside titanium oxides. [23] Hematite is the characteristic component of the Swedish paint color Falu red.
Hematite varieties include kidney ore, martite (pseudomorphs after magnetite), iron rose and specularite (specular hematite). While these forms vary, they all have a rust-red streak. Hematite is not only harder than pure iron, but also much more brittle. The term kidney ore may be broadly used to describe botryoidal, mammillary, or reniform ...
Iron(II,III) oxide, or black iron oxide, is the chemical compound with formula Fe 3 O 4.It occurs in nature as the mineral magnetite.It is one of a number of iron oxides, the others being iron(II) oxide (FeO), which is rare, and iron(III) oxide (Fe 2 O 3) which also occurs naturally as the mineral hematite.
The brilliant opaque red of vermillion, for example, results because vermillion reflects the major part of red light, but absorbs the blue, green and yellow parts of white light. [1] Red pigments historically were often made from iron oxides, such as hematite. These pigments have been found in cave paintings in France dating to between 16,000 ...
Rust, rusted, or rusty iron; Iron Ore, which may be Hematite (literally, blood-like stone), Taconite, or other types red-colored iron ore; A particular place, street, or business name in the Mesabi Range or similar iron ore mining region; Structural steel, because it is often manufactured with no rust protection or with only a red oxide coating
Electrochemically oxidized iron (rust) An iron oxide is a chemical compound composed of iron and oxygen. Several iron oxides are recognized. Often they are non-stoichiometric. Ferric oxyhydroxides are a related class of compounds, perhaps the best known of which is rust. [1]
Hematite (Fe 2 O 3) is usually the pigment in red beds and requires oxidizing conditions. Limonite (2Fe 2 O 3 ·3H 2 O) is used for unidentified massive hydroxides and oxides of iron. [ 11 ]
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