Crystals Rocks Minerals to Tempt and Tantalise You


large rounded mineral known as a thunderegg



A thunderegg is a structure (as opposed to a mineral) which is formed in lava flows. The centre then splits to form a cavity. Over time the cavity fills with either agate, opal, jasper or some other type of crystal and the end result is a rock that when cut open reveals a self-contained centre surrounded by rock matrix.



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