Botryoidal limonite

Weight: 302g. Dimensions: 116x90x24mm. Provenance: Hubei province, China. Beautiful reddish-brown botryoidal limonite, with these golden nodules and these rust reflections. To get a better view of this Limonite, some photos are taken with LED lighting, others in natural light with sun and without. Limonite is not a single mineral, but a natural mixture of iron oxides and hydroxides. It appears as brown, yellow, or ochre masses. It is often found in soils or marshy areas under the historical name “ferrous marshes.” Goethite is a very common mineral composed of iron oxyhydroxide and forms by the alteration of iron-rich rocks; it constitutes the main component of natural rust. Limonite is actually a generic term for a group of hydrated iron oxides, often amorphous. Limonite is recognizable by its swollen nodules and golden reflections. The mineral has red-brown hues, typical of limonite, with these well-formed nodules and more pronounced rust reflections. Limonite, in fact, is a grouping of hydrated iron oxides, somewhat amorphous, so it does not have a well-defined crystal structure. It often forms by alteration of iron-rich minerals, such as magnetite or pyrite. It is commonly found in soils, wetlands, or as a secondary ore in iron deposits. It is sometimes used as a pigment as well, for its ochre tones. So we very often find the two minerals associated.

Schätzpreis:€150

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