Minerals / Jasper, Leopardskin Variety. Spain.

Jasper, SiO2,  Silicon dioxide. is an aggregate of chalcedony and microgranular quartz, and may be coloured by inclusions of other minerals, usually iron, This specimen has attracted the variety name of leopardskin jasper. Its orbicular  pattern is created by diffusion from centres, and the reddish colour is probably the result of iron inclusions. The small cavity is lined with very small crystals of quartz. The location of the specimen is loosely given as Spain.

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