Question

PLEASE HELP ME!
1. Classify the following materials as a Mineral, Gem, Ore, or None. Some may have more then one answer.

hematite
sphalerite
diamond

2. Explain why most quartz is not considered a gemstone while amethyst, which is a kind of quartz, is a gemstone.

3.What three qualities of titanium make it a good material for producing hip or knee replacements?

4.What qualities must a mineral possess in order to be considered a gem?

5.Today, most mining for ore involves digging beneath Earth's surface. Why is this necessary?