sperrylite

The grains of sperrylite are surrounded by later veins of pyrite.

One of the museum's pieces, a sperrylite from Russia, is considered one of the finest in the world.

Sperrylite is a tin-white mineral known for its brilliant metallic luster, with a grey to black streak.

Sperrylite from the type locality.

New forms of Sperrylite.

Sperrylite belongs to the pyrite group of minerals and therefore it shares similar structure and crystal habits with them.

Occurrence of sperrylite in North Carolina.

On the Crystalline form of Sperrylite.

Sperrylite is composed of loose aggregate of bright silver cubes, some with octahedral modifications.

Sperrylite is formed by contact metamorphism, as in indicated by the development of triple point annealing contacts with pyrrhotite grains.

The most important occurrence of Sperrylite is in the nickel ore deposit of Sudbury Basin in Ontario, Canada.

(Nicol and Goldschmidt 1903) identified seventeen crystal forms exhibited by sperrylite, including four different trapezohedra, a trisoctahedron, five pyritohedra, and four diploids.

Sperrylite is cubic (2/m3) and is typically seen in well-developed cubes or cuboctahedra, some of which are so highly modified that crystal edges and comers appear rounded.

Sperrylite was first described by H. H. Wells in 1889 from material collected at the Vermilion mine in what is now the Sudbury district, Ontario, Canada.