Pink opal is a type of Common Opal that's also known as "potch". Stones are opaque and occur in many different colours.
The name "Common Opal" comes from the fact that it's common and can be found in many places around the world.
Common Opal has the same chemical composition as "Precious Opal". The main difference is that it doesn't exhibit "play of colour".
The vast majority of the world's opals are Common Opal yet it's not that well known.
Pink opal is possibly the most sought after colour. Most of the finest grade material comes from Peru.
Pink opal from Western Australia is a type of mookaite. The deposit is just one kilometre from where mookaite is mined.
The two materials are mined by the same company.