One of the museum's pieces, a sperrylite from Russia, is considered one of the finest in the world.
12.
:: : Materials with the same hardness don't leave a streak on each other, but sperrylite can be hardness 6 to 7.
13.
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.
14.
:: Sperrylite has a specific gravity of 10.6-roughly the same as lead-so dense that even without proper equipment it should be possible to make a rough estimate that rules it in or out.
15.
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 . ( Nicol and Goldschmidt 1903 ) identified seventeen crystal forms exhibited by sperrylite, including four different trapezohedra, a trisoctahedron, five pyritohedra, and four diploids.
16.
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 . ( Nicol and Goldschmidt 1903 ) identified seventeen crystal forms exhibited by sperrylite, including four different trapezohedra, a trisoctahedron, five pyritohedra, and four diploids.
17.
I do not have equipment to find its specific gravity, but with porcelain streak plate ( which I use bottom of my porcelain crucible ) it did produce black streak, the picture of it can be viewed at my blog . So, does this confirm the material I have is sperrylite ? Preceding talk ) 13 : 24, 24 March 2011 ( UTC)
