I have read Downing’s books and Eckert’s books on opal. They’re
good! I am trying to find an opal book that is intensive on
regarding color patterns. I heard that “A Field guide
to Australian Opals” by Barrie O’Leary is intensive on the subject.
True? Is the old book by Tullie Wollaston “Opal: Gem of the Never
Never” good? I’m really interested in locating these or any other
opal referneces that are intensive on rare patterns, rare varieties,
and detail of some of the mines. Any place I can find these?