How do I identify Groutite?

Groutite can be identified by its hardness of 3.5 - 4 on the Mohs scale, Black color. Look for these key characteristics when examining specimens.

What color is Groutite?

Groutite typically appears in Black, may be iridescent. Color can vary depending on impurities and formation conditions.

How hard is Groutite?

Groutite has a hardness of 3.5 - 4 on the Mohs scale. This gives it moderate hardness.

How to Identify Groutite | Properties, Meaning & Uses

What is Groutite?

Groutite is a manganese oxide mineral with formula MnO(OH). It is a member of the diaspore group and is trimorphous with manganite and feitknechtite. It forms lustrous black crystals in the orthorhombic system. It occurs in weathered banded iron formations, metamorphosed manganese ore bodies and hydrothermal ore environments. It was first described in 1945 for an occurrence in the Mahnomen mine, Cuyuna Range, Crow Wing County, Minnesota and named for petrologist Frank Fitch Grout (1880–1958), of the University of Minnesota.

Groutite Market Value Calculator

Estimate the market value of Groutite using size, quality, and finish. This preview calculator is for quick context and is not a formal appraisal.

Groutite Localities Map

See where Groutite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.