Paraffin wax
The simplest paraffin molecule is that of methane, CH4, a gas at room temperature. Heavier members of the series, such as that of  octane, C8H18, and mineral oil appear as liquids at room temperature. The solid forms of paraffin, called paraffin wax, are from the heaviest molecules from C20H42 to C40H82. Paraffin wax was identified by Carl Reichenbach in 1830.