Turgite Raw Minerals Stones Rocks Collecting

Description

Origin : Goldfield, Nevada (U.S.A.)

Iridescent Turgite 10-20 gr - cm 2-4 Raw Minerals Stones Rocks for Collection.

Originally described from the Turjinskii (or Turginsk) mine in Russia, Turgite is generally considered to be a variety of the two most common minerals: goethite and hematite. It may be iridescent.
Turgite, often referred to as a "variety" of either hematite or goethite, is actually a blend of the two minerals due to goethite weathering, typically found in the botryoidal (globular) habit of the "parent" goethite.
However, because it is a blend of two minerals, it is not considered a mineral in itself.
Goethite is a common iron ore. It is often formed by the breakdown of other iron-rich minerals, so it is a common component of soils. It can form excellent pseudomorphs after the original minerals, especially pyrite or marcasite. Goethite can also be precipitated from groundwater or other sedimentary conditions, or formed as a primary mineral in hydrothermal deposits. When present in sufficient quantities, it forms an important iron ore. Turgite apparently only forms under specific environmental conditions which prevent the specimens from losing their luster and turning into dull gray hematite.