Dolerite, also known as diabase, is a fine-grained igneous rock composed primarily of feldspar and pyroxene. Valued for its exceptional hardness and durability, dolerite has been used throughout history for architectural features, monuments, paving, millstones and sculpture. Although less common in decorative antiques than marble or granite, antique objects crafted from dolerite are appreciated for their strength and distinctive dark appearance. *Related Terms\ *Basalt, Granite, Marble, Monumental Stone, Stone Sculpture.