is an opaque black, metallic ruthenium sulfide
mineral with formula: RuS2
. It crystallizes in the isometric
system. It is in the pyrite
structural group. Though rare, it occurs in many parts of the world.
Laurite has a Mohs hardness
of 7.5 and a specific gravity
of 6.99. It can contain osmium
, and iron
substituting for the ruthenium. It occurs in ultramafic
cumulate deposits and sedimentary placer
deposits derived from them.
It was discovered in 1866
and named for Laurie, the wife of Charles A. Joy, an American chemist