1986 Centenary of Geological Society. A set of three.
Minerals represented: Kugelgranit (granite with dark mica and feldspar), Rapakivi (granite with K-feldspar and plagioclase), and Vein Gneiss (with red granite).
1986 Centenary of Geological Society. A set of three.
Minerals represented: Kugelgranit (granite with dark mica and feldspar), Rapakivi (granite with K-feldspar and plagioclase), and Vein Gneiss (with red granite).