In this episode, visits mineralogist Joel Bartsch to discover the real value of minerals and gems. Subjects Covered Include: What does a mineralogist do? Are all minerals valuable? What is the difference between a mineral and a rock? What is the most precious mineral? Why do they use minerals in toothpaste? Why are some minerals so colorful? What is fool's gold? What is a gemstone? What makes a mineral valuable? What is a carat? Grades 4-8. 13 minutes on DVD.