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Aurorite
Aurorite is a dark-colored mineral with the chemical formula (Mn2+,Ag,Ca)Mn4+3O7·3H2O. It is named for its type locality, the North Aurora mine in White Pine County, Nevada.
Intro adapted from Wikipedia (CC BY-SA).
Aurorite is an IMA-recognized mineral species in the oxides & hydroxide class, with the chemical formula Mn²⁺Mn⁴⁺₃O₇·3H₂O.
It crystallizes in the hexagonal crystal system (space group R-3).
Key properties: Mohs hardness 3; specific gravity 3.81.
IMA symbol Aro, IMA status: approved, named in 1966.
Found in veinlets filling microfractures in manganoan calcite (Aurora mine, Nevada, USA).
It is found associated with Manganoan calcite, argentian todorokite, cryptomelane, pyrolusite, chlorargyrite, silver, quartz (Aurora mine, Nevada, USA).
The name refers to the occurrence at the Aurora mine, Nevada, USA.