Sauna Stones: 20 Types and Their Heat Retaining Properties
2. Diabase: Globally popular. Diabase stones, also known as dolerite, are a type of igneous rock that forms from the slow cooling of molten lava. This rock is typically dark gray to black in colour and has a medium to coarse-grained texture. Diabase is composed mainly of plagioclase feldspar, pyroxene, and sometimes olivine.
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