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Formula: Pd11As2Te2
Alloy of tellurium, palladium
and arsenic
Crystal System: Isometric
Specific gravity: 11.205 calculated
Hardness: 5
Streak: Silvery black
Colour: Black
Environments
Localities
At the type locality, the Miessijoki River, Enontekiö, Lapland, Finland, törnroosite was discovered in a
heavy-mineral concentrate from the river. The associated minerals include
sperrylite, a platinum –
iron alloy, cooperite,
braggite, a native osmium –
iridium – ruthenium alloy,
irarsite, laurite,
isomertieite, mertieite,
native platinum, a native gold –
silver alloy, atokite,
a platinum - copper alloy, a
copper – platinum –
palladium alloy, a copper –
palladium – platinum –
gold alloy, and a palladium -
gold alloy, along with magnetite,
ilmenite, chromite,
hematite, columbite –
tantalite, tapiolite,
garnet, monazite,
zircon, pyrite,
rutile, uraninite –
thorianite, galena, and a
mineral of the wolframite series
(CM 49.6.1643-1651).
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