Prospective alluvial sapphire
deposits related to Cenozoic trachybasalt volcanic formations. Modern alluvial placer deposits, in which yellow, green, blue sapphires
occur with olivine, pyroxene (enstatite
, etc.), black spinel
Ref: E.Ya. Kievlenko (2003) Geology of gems, p. 68
Gem list contains entries from all listed localities in region.
Localities in this Region