Minerals / Agate, tree agate.

Tree agate is a form of chalcedony, which is microcrystalline quartz. SiO2. It's proper name is dendritic quartz, or dendritic agate.

The main body is a dirty white with a hint of green. The tree part of the description is an obvious reference to the similarity of the branches of a tree. The green inclusions are dendritic manganese with maybe a small amount of iron.

The specimen is from S.W. Australia,and was collected by the club's co-founder, Jim Nicholls, while working in Australia.

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