What is Turgite?

What is Turgite?

/ (ˈtɜːdʒaɪt) / noun. a red or black mineral consisting of hydrated ferric oxide.

What mineral group is goethite in?

diaspore group
Goethite (/ˈɡɜːrtaɪt/, US also /ˈɡoʊθaɪt/) is a mineral of the diaspore group, consisting of iron(III) oxide-hydroxide, specifically the “α” polymorph. It is found in soil and other low-temperature environments such as sediment. Goethite has been well known since ancient times for its use as a pigment (brown ochre).

Where is goethite found?

Goethite is the source for the pigment known as yellow ochre; it is also the primary mineral in some important iron ores, such as those in the Alsace-Lorraine basin in France. Other important goethite deposits are found in the southern Appalachians, U.S.; Brazil; South Africa; Russia; and Australia.

How is Turgite formed?

Turgite often referred to as a “variety” of either hematite or goethite, it is a mixture of the two minerals due to the alteration of goethite, typically found in the botryoidal habit of the “parent” goethite. It often forms by weathering of other iron-rich minerals, thus is a common component of soils.

Is Turgite natural?

The exact nature of the material called turgite is not agreed upon. Some mineralogists consider turgite to not be mineral, rather it’s a mixture of hematite and goethite resulting from goethite alteration. Others regard turgite as a hydrous hematite mineral (2Fe2O3·H2O).

What is the difference between goethite and hematite?

Hematite is solid material with no internal structure visible and Goethite has the inner needle-like structure. So if you look at broken surfaces and can see the inner close packed striated structure Goethite is the mineral. Goethite can also be tiny yellow to brown needles, standing on their own.

Is goethite a silicate clay?

In practice, “clay” is used to refer to the fine-grained, mineral fraction of earth material, and can include clay silicates as defined above, oxide-hydroxide minerals, such as goethite, hematite, manganese oxides, and some zeolites.

Is goethite a secondary mineral?

Goethite is a common secondary mineral derived from the alteration of other iron-rich minerals especially magnetite, pyrite, siderite and hematite under oxidizing conditions.

Are goethite and limonite the same?

limonite, one of the major iron minerals, hydrated ferric oxide (FeO(OH)·nH2O). It was originally considered one of a series of such oxides; later it was thought to be the amorphous equivalent of goethite and lepidocrocite, but X-ray studies have shown that most so-called limonite is actually goethite.

Is goethite a clay mineral?

The word “clay” is also used to refer to a particle size in a soil or sediment. In practice, “clay” is used to refer to the fine-grained, mineral fraction of earth material, and can include clay silicates as defined above, oxide-hydroxide minerals, such as goethite, hematite, manganese oxides, and some zeolites.

Where is Turgite found?

Turgite (Graves Mountain, Georgia, USA) 7.

What are the properties of Rainbow hematite?

The rainbow hematite occurs as iridescent, specular seams oriented parallel to bedding . The material is brittle and fractures into lath-like splinters, but the crystals within the laths have a granoblastic texture, a term used to describe equigranular minerals without sharp crystal faces in metamorphic rocks.

Where is Hematite found?

Huge deposits of hematite are found in banded iron formations. Gray hematite is typically found in places that can have still standing water or mineral hot springs, such as those in Yellowstone National Park in North America.

Is hematite a mineral?

Hematite is the mineral form of Iron, and is black, gray, brown, reddish brown, or red. It is mined as the main ore of iron. When polished it has a look of silver and is used as a gemstone.

Is hematite metallic?

Hematite that has a metallic luster is called specular hematite, or specular iron. , mixture of varying proportions of iron oxide and clay, used as a pigment. It occurs naturally as yellow ocher (yellow or yellow-brown in color), the iron oxide being limonite, or as red ocher, the iron oxide being hematite.