Usage examples (15)

• The valley-sides of dark trap were striped with white veins of heat-altered argil; the sole with black magnetic sand; and patches of the bed were buttercup-yellow with...
• Of flint or silex, lime or calcareous earth, and clay or argil, in various degrees of combination, the greatest parts of the mountains and plains, and the whole of what...
• So rich is the dark-colored tenacious argil of the
• Mica slate has still more argil in it, and decomposes more rapidly.