natural glass: magma of any composition that cooled very rapidly
glass: a brittle transparent solid with irregular atomic structure
gastrocybe lateritia: a species of Gastrocybe fungus that has a conic cap and a thin stalk; at first the stalk is upright but as it matures the stalk bends over and then downward; the cap then gelatinizes and a slimy mass containing the spores falls to the ground as the stalk collapses