Scale of Hardness Collection

• SHIPS DIRECTLY FROM THE MANUFACTURER; MAY TAKE 4-6 WEEKS TO SHIP.
• This collection is the traditional Mohs Scale which assigned a "hardness" to ten key minerals with talc #1 (the softest) and diamond #10 (the hardest).
• The first 9 minerals are included in this set. Nine specimens approximately 1" x 1 1/2", number-coded.
• Included are specimens of Talc, Feldspar, Gypsum, Quartz, Calcite, Beryl, Fluorite, Corundum, and Apatite.
• Grades: 6-12.