Miguelromeroite Locality: Veta Negra Mine, Pampa Larga district, Tierra Amarilla , Copiapó Province , Atacama Region , Chile ( Locality at mindat.org ) Size: 1.5 x 1.3 x 1.0 cm. Originally sold as Villyaellenite, these specimens have now been identified as miguelromeroite (IMA2008-066). This beautiful and super-rich thumbnail is aesthetically covered with sprays of gemmy, lustrous, vivid pink crystals of miguelromeroite crystals and is from the 1997 find by Terry Szenics at the Veta Negra Mine of Chile. — Photo: Robert M. Lavinsky · CC BY-SA 3.0
Miguelromeroite
A hydrated manganese arsenate named by Anthony Kampf for Spanish mineralogist Miguel Romero Sánchez, approved in 2009.
Intro adapted from Wikipedia (CC BY-SA).
Miguelromeroite is an IMA-recognized mineral species in the arsenate class, with the chemical formula Mn₅(AsO₃OH)₂(AsO₄)₂(H₂O)₄.
It crystallizes in the monoclinic crystal system (space group C2/c). It is a member of the Hureaulite structural group.
Key properties: Mohs hardness 4; specific gravity 3.69; Very pale pink streak; Vitreous luster; optically biaxial.
IMA symbol Mig, IMA status: approved, named in 2008.
Found in secondary oxidation zones of arsenic-rich base metal deposits.
It is found associated with Arseniosiderite, ogdensburgite, chalcophanite, adamite.
Miguel Romero Sanchez (1926-1997) for his dedication to documenting and preserving Mexico’s rich mineral heritage.