Minerals / Opal, Norsman opal mine,Australia.

Opal, common Opal. SiO2 . nH2O.  Opal is a hydrated amorphous form of silica, and so it is classed as a mineraloid. This common opal variety is from the Norseman opal mine in Western Australia, and is locally known as gold lace opalite.  The variety is described as being a yellow brown opal with black dendritic inclusions. This specimen is as the variety description, and was collected by Jim Nicholls, co-founder of our club while living near Norseman.

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