Alleghanyite is a moderately rare humite mineral with formula Mn₅(SiO₄)₂(OH)₂, belonging to the

nesosilicate Silicate minerals are rock-forming minerals made up of silicate groups. They are the largest and most important class of minerals and make up approximately 90 percent of Earth's crust. In mineralogy, the crystalline forms of silica (silicon dio ...

s class. In general its occurrences are related with

metamorphic Metamorphic rocks arise from the transformation of existing rock to new types of rock in a process called metamorphism. The original rock (protolith) is subjected to temperatures greater than and, often, elevated pressure of or more, causi ...

(metamorphosed) manganese deposits. The mineral is named after Alleghany County,

North Carolina North Carolina ( ) is a U.S. state, state in the Southeastern United States, Southeastern region of the United States. It is bordered by Virginia to the north, the Atlantic Ocean to the east, South Carolina to the south, Georgia (U.S. stat ...

, US.

References

Manganese(II) minerals Hydroxide minerals Humite group Monoclinic minerals Minerals in space group 14 {{silicate-mineral-stub

See also

References