Zululand Amethyst Geode
 
Origin: South Africa, KwaZulu Natal, Jozini
 
A very well-known and popular stone. Amethyst is a coloured variety of Quartz, its colour can vary from light pinkish violet to a deep purple. These geodes are from ancient basaltic lavas that formed by water bubbles trapped in the lava, cooling and forming crystals.
 
The photos were taken in bright sunlight to bring out their best colours.