Definition: Tunnelite, also known as volcanic glass or lava rock, is a type of igneous rock that forms when magma rises from the Earth's mantle and cools rapidly under pressure. It is composed primarily of silica (SiO2) and is typically found in areas where tectonic plates are moving or where magma has erupted over geologic surfaces. Tunnelite is often used as a building material, such as for construction of bridges, tunnels, and other structures. It can also be
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