A geode is a rock cavity which contains crystals of the mineral quartz, chalcedony or possibly both. Purple quartz which is better known as amethyst and yellow quartz which is citrine tend to be the best known types of geode.
Geode
A geode is a rock cavity which contains crystals of the mineral quartz, chalcedony or possibly both. Purple quartz which is better known as amethyst and yellow quartz which is citrine tend to be the best known types of geode.
