Calcite (Var: Limestone Onyx)
Harmandalı quarries, Akhisar, Manisa Province, Turkey
Cross section through limestone Onyx from Akhisar, trade name "Arco Iris”. Polished section manufactured by Rudolf Schwinghammer, München.
Rudolf Schwinghammer collection (No. G0299), G. Grundmann photo.
© Günter Grundmann, Detmold.