
I’ve been cutting some new nobby rough opal from Lightning Ridge. I thought it be good to share some of the unique features of these type of formations. I’ve selected an example to work on in the image below. The one thing that many (but not all) of these nobbies have in common is a potch base and a white cap on top. We see this a lot in rich deposits of opal. Some of the main opal fields including places like Jag Hill, Wyoming, and much of the Coocoran opal fields all have this in common. The Nobby You can see from the bottom up of this
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