pyroaurite

[¦pī·rō′ȯ‚rīt]

(mineralogy)

Mg₆Fe₂(OH)₁₆·CO₃·4H₂O A goldlike or brownish rhombohedral mineral composed of hydrous basic magnesium iron carbonate.

References in periodicals archive ?

Considerable work by Moreland and Padget (5) have shown that this dark layer is a member of the mineralogical group known as pyroaurite. They form hexagonal plate crystals which tend to lay down as layered barrier films.

Elucidation of corrosion failure mechanisms of coated Phosphated steel substrates

Pyroaurite and Sjogrenite [Mg.sub.6][Fe.sub.2.sup.3+](C[O.sub.3])(OH)[.sub.16] x 4[H.sub.2]O

We found pyroaurite at Ightem again in late 2005, as small hexagonal plates (XRD analysis by Paolo Orlandi, Pisa).

Famous mineral localities: Bou Azzer, Morocco

Traces of brucite were disclosed by XRD in altered serpentinite, with palygorskite, stevensite and pyroaurite.

Palygorskite occurs as fine-grained white material intergrown with pyroaurite, stevensite and brucite in altered serpentinite.

Pyroaurite [Mg.sub.6][Fe.sup.3+.sub.2]([CO.sub.3])[(OH).sub.16].4[H.sub.2]O

Pyroaurite occurs as fine-grained white material intergrown with playgorskite, stevensite and brucite in altered serpentinite.

Saponite occurs as fine-grained white material intergrown with pyroaurite, palygorskite and brucite in altered serpentinite.

The Lord Brassey Mine, Tasmania. (Famous Mineral Localities)

(1980) La comblainite, nouveau mineral du groupe de ia pyroaurite. Bulletin de Mineralogie, 103, 113-117.

Cobalt minerals of the Katanga Crescent, Congo

(1981) Hydrohonessite - a new hydrated Ni-Fe hydroxyl-sulphate mineral; its relationship to honessite, carrboydite, and minerals of the pyroaurite group.

Halls Gap Lincoln County, Kentucky

(1981) Hydrohonessite--a new hydrated Ni-Fe hydroxy-sulphate mineral; its relationship to honessite, carrboydite and minerals of the pyroaurite group.