the world > the earth > minerals > types of mineral > oxides and hydroxides > native earths > [noun] > ochre (5)
Any of various natural earthy materials or clays which are rich in iron oxides and vary in colour from light yellow to deep orange-red or brown…
a form of yellow ochre formerly obtained from deposits at Shotover, near Oxford.
Mining. Reddish-brown iron oxide ore containing minute particles of silver.