any of various forms of aluminum oxide occurring naturally as corundum

white crystalline compound that occurs naturally as the mineral gibbsite

any of various forms of aluminum oxide occurring naturally as corundum

any of various forms of aluminum oxide occurring naturally as corundum

white crystalline compound that occurs naturally as the mineral gibbsite

white crystalline compound that occurs naturally as the mineral gibbsite

any of various forms of aluminum oxide occurring naturally as corundum

common edible mushroom found naturally in moist open soil; the cultivated mushroom of commerce

common edible mushroom found naturally in moist open soil; the cultivated mushroom of commerce

common edible mushroom found naturally in moist open soil; the cultivated mushroom of commerce