OPALS is a book that explains the history, formation, and locations of opal mines around the world. It is filled with anecdotes as well as dozens of beautiful full color photographs. Also contained is a gem course which gives readers a great understanding of the colored gemstone business.
The author is obviously passionate about the subject and his passion is well reflected. My annoyance with the book was it's occasional errors such as relating to the geography of Australia. I was hoping for a book with substance on the topic, I recieved an enjoyable read.