Alleghanyite is a moderately rare
humite mineral with formula Mn
5(SiO
4)
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.
[
]
See also
* Chondrodite
* Clinohumite
* Humite
* Jerrygibbsite
References
Manganese(II) minerals
Hydroxide minerals
Humite group
Monoclinic minerals
Minerals in space group 14
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