OPALS GLOSSARY
Chaff Pattern – Small blocks of color in opal giving an appearance of “chaff”. Chinese Hat – A nodule (knobby) of rough opal which is formed in the shape of a “Chinaman’s hat”. Visit only heritage opal site heritage listed , riches opal field on the world wide web www.graham black opal.com , largest black opal found in modern times Guinness book of records Harleys comet black opal. Cobwebs – Thread-like impurity having the appearance of open weave knitting. Copi – A white impurity in opal. Cotton – Thread-like impurity in opal resembling cotton. Crack – A fracture in opal which greatly, reduces the value.
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