Mineral Oils
See PETROLEUM.
Minerals are all such natural bodies as are destitute of organization, existing either within or on the surface of the earth, and which are neither animal nor vegetable.
The hardness of minerals, beginning with the softest, is as follows: 1. Talc; 2. Gypsum; 3. Calcareous spar; 4. Fluorspar; 5. Apatite; 6. Feldspar; 7. Quartz; 8. Topaz; 9. Sapphire; 10. Corundum; 11. Diamond. See PRECIOUS STONES; EARTHS; MINERALS.