Agate is the term applied not to a distinct mineral
species, but also to an aggregate of various forms of
silica, chiefly Chalcedony. According to Theophrastus
the agate was named from the river Achates, in
Sicily, where these gem
stones were first found.
Historical Facts of Agate
Refractive Index
1.530 - 1.539
Chemical Composition
Hardness
Density
2.57 - 2.64
Crystal Group
Hexagonal
Ocurrence
Scotland, U.S.A., India, England, Italy,
Brazil, Uruguay, Germany, Egypt, Indonesia, and many
other localities
