Mineral Scale of Hardness Set, 9 specimens

Any aspiring geologist will love this set of 9 Mohs Scale of Hardness minerals. Numbered specimens allow you to accurately determine hardness to identify rocks and minerals you collect. Nine of the 10 hardness levels are included (all but diamond, the hardest). Size averages 1-2" for all specimens. Packed in a nice divided box with identification key.

Mineral Scale of Hardness Set, 9 specimens

• Talc (hardness = 1)
• Gypsum (hardness = 2)
• Calcite (hardness = 3)
• Fluorite (hardness = 4)
• Apatite (hardness = 5)
• Feldspar (hardness = 6)
• Quartz (hardness = 7)
• Beryl (hardness = 8)
• Corundum (hardness = 9)

You can use other common objects (not included) to supplement this scale as follows:

• Fingernail (hardness = 2.5)
• Copper coin (hardness = 3.5)
• Window glass (hardness = 5.5)
• Steel file (hardness = 6.5)