Raw basalt rock specimens set of 12-(ELS-ROK1206)

Raw basalt rock specimens 1 inch samples set of 12 - Basalt makes up the majority of the earth's oceanic crust. Formed quickly from a magma that is rich in iron, basalt exhibits a dark colour and small crystal size. The perfect example of an aphanitic (fine grained) igneous rock. Each specimen is selected and hand processed by a geologist, ensuring each sample exhibits defining features. Set of 12 1inch samples. -