Images
Formula: Mn2+5(AsO3OH)2(AsO4)2(H2O)4
Arsenate,
hureaulite group,
manganese-bearing mineral
Crystal system: Monoclinic
Specific gravity: 3.69 measured, 3.714 calculated for the empirical formula
Hardness: 4
Streak: Very pale pink
Colour: Orange-pink, pink, pale pink, colourless
Environments
Miguelromeroite occurs in secondary oxidation zones
of arsenic-rich base metal deposits. Associated minerals include
arseniosiderite,
ogdensburgite,
chalcophanite and adamite
(HOM).
Localities
At the Veta Negra Mine, Pampa Larga mining district, Tierra Amarilla, Copiapó Province, Atacama, Chile,
miguelromeroite occurs as sprays and divergent aggregates of transparent pink prisms to several millimeters
in length
(Mindat).
Miguelromeroite from the Veta Negra Mine -
Image
At the type locality, the Ojuela Mine, Mapimí, Mapimí Municipality, Durango, Mexico, miguelromeroite has been
found as a compact spray of orange-pink, prismatic crystals up to 4 cm in length in the
secondary oxidation zone assemblage, associated with
adamite, arseniosiderite,
chalcophanite and
ogdensburgite
(Mindat).
Miguelromeroite from the Ojuela Mine -
Image
At the Sterling Mine, Sterling Hill, Ogdensburg, Sussex County, New Jersey, USA, miguelromeroite occurs as
transparent orange-pink crystals in flattened, circular, radial aggregates 7 mm across
(Mindat).
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