Formula: PbMn2+VO4(OH)
Anhydrous vanadate containing hydroxyl,
adelite-descloizite group,
descloizite -
mottramite series,
manganese-bearing mineral
Crystal System: Orthorhombic
Specific gravity: 5.58 to 5.79 measured, 5.82 calculated
Hardness: 3½
Streak: Orange-yellow, red-orange
Colour: Red, dark red
Environments
Pyrobelonite occurs typically in metamorphosed iron-manganese deposits
(Webmin, HOM).
Associated minerals include axinite-(Mn),
cahnite,
dolomite, manganese oxides, manganoan calcite
and vanadinite
(HOM, Mindat).
Localities
At the type locality, Långban, Filipstad, Värmland County, Sweden, pyrobelonite is associated with
hausmannite, pyrochroite,
manganite, baryte and
calcite
(Dana, HOM).
At the Fianel mine, Switzerland, pyrobelonite is associated with medaite,
palenzonaite, saneroite,
fianelite, parsettensite,
rhodochrosite, kutnohorite,
aegirine and quartz
(HOM).
At Ty Coch Mine, Porthcawl, Bridgend, Wales, UK, pyrobelonite occurs in
limestone-hosted hematite deposits forming
grains and clusters in calcite with
braunite
aggregates, hausmannite crystals and partial
pseudomorphs thereof, and as lamellae
between baryte laths. Often the grains are intimately associated with
vanadinite
(MW).
Other associated minerals include manganoan calcite,
romanèchite, baryte,
quartz, dolomite and manganese oxides
(Dana, HOM).
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