may
be used as a precious stone. The coarser varieties are more suitable
for use as abrasives than Emery, since the latter contains such softer
impurities as Magnetite and Haematite. It occurs both in distinct,
though often rough, crystals and in large crystalline masses. It is
found in many of the localities mentioned under Ruby and Sapphire, as
Chantabun in Siam; also on the Malabar coast, at Canton in China, and
at Gellivara in Sweden.
3.
Emery is a granular impure form of Corundum, containing Magnetite and
Haematite. It is of great commercial use as an abrasive, though now
carborundum is displacing it in this use to a large extent. It is found
in Naxos, Samos, and Nicaria in the Grecian Archipelago ; also east of
Ephesus in a granular limestone; in the United States at many places,
as Chester in Massachusetts, and in Chester County in Pennsylvania.
