[Morphological studies on the formation of oxalate stones (author's transl)]

The present paper deals with experimental and crystaloptical studies on synthetic and native Ca-oxalate. The findings are in favour of a uniform way of formation of Ca-oxalate stones from Ca-oxalate dihydrate crystals as primary crystallization product in urine, developing into the monochydrate phase by dehydratation. Rapid growth and a sufficiently high concentration of foreign ions (Mg) in the urine support the formation and stabilisation of dihydrate stones.