Definition: The word "amphigonium" means a small, round, or spherical shell. It refers to a type of volcanic glass that forms within a magma chamber under intense heat from an eruption, often with bubbles of lava within it. Amphigonium is unique among other types of volcanic glass because it has a low refractive index and high density, making it highly reflective and reflecting the natural light emitted by the volcano's lava flow. The definition also highlights its distinctive appearance, which includes smooth, white or creamy-like surfaces that resemble small, round stones.
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