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Formula: Sb2AsS2
Sulphide
Crystal System: Monoclinic
Specific gravity: 5.21 calculated
Hardness: 2½
Streak: Brownish grey
Colour: Grey
Environments:
Pääkkönenite occurs in hydrothermal mineral deposits with other antimony and
arsenic bearing minerals.
At the Hemlo gold deposit, Thunder Bay District, Ontario, Canada, pääkkönenite is associated with
vaughanite, stibarsen,
realgar and arsenic (HOM).
At Příbram, Central Bohemian Region, Czech Republic, pääkkönenite is associated with
stibarsen,
arsenic, stibnite,
sphalerite, siderite and
quartz (HOM).
At the type locality, Kalliosalo, Nurmo, Seinäjoki, South Ostrobothnia, Finland, pääkkönenite is associated with
native antimony, arsenopyrite,
arsenic, löllingite,
stibnite and antimony
(HOM, AM 67.858, AM 80.1054-1058).
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