Typical is the diabase rock and the digestion of fossil pillow lava on a flank. Diabas is the old basalt of the Franconian Forest. Glowing magma penetrated the earth ages and solidified to a fine-grained volcanic rock. The rock is a mixture of soda lime feldspar and pyroxene. While young volcanic rocks of this composition are called basalt, the older ones from the Earth's antiquity are called Diabas. In quarries in the vicinity of the Höllental at Marxgrün and Berg, the hard rock is mined today. It is used as aggregate for concrete production and road construction.
July 3, 2018
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