What is opal?
The silica family

When did man find opal?
History of precious opal

Looking for opal
Mining and exploration

How is opal treated?
Presentation of opal

The fakes
Synthetic and imitation opal

The land of opal?
Opal in australia

Where else is opal found?
Opal world wide

Nature of opal
Scientific discoveries

Where does opal come from?
Formation of opal

What use is opal?
Opal in industry and engineering