This Moh’s Hardness Scale collection is mounted on a 5 1/2″ X 7 1/8″ full color cardstock which holds 9 specimens in their order from the softest (#1 Talc) to the hardest (#10 Diamond not included). There are indicators on the card which instruct the students what will affect the surface of each of these specimens. This economy version of the Hardness Collection has specimens measuring 1/2″ to 3/4″ in size. The card is packaged in a resalable zip lock bag. Grade Level 6-12. Ages 11-18.