Eight real mineral specimens that cover the Mohs hardness scale from 2 to 9, chosen for classroom scratch tests. Students test each one with a fingernail, a copper coin, a steel nail and a glass plate, then put them in order using their own evidence.
- 2 Selenite (gypsum), round 4" bowl
- 3 Honey calcite, rough chunk 2-4"
- 5-5.5 Lapis lazuli, rough chunk 2-4"
- 6-6.5 Labradorite (feldspar), rough chunk 2-4"
- 7 Clear quartz, small cluster
- 8 Spinel crystals in marble (two hardnesses in one rock)
- 8.5 Alexandrite (chrysoberyl), 1 g bag of tiny crystals
- 9 Sapphire (corundum) crystal, 3 to 4.9 g
Most school rock kits stop at quartz (7). This set adds spinel, chrysoberyl and sapphire so a class can work the hard end of the scale too. Every piece is natural, so sizes and colours vary.
Mohs Hardness Classroom Kit - 8 Specimens
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Eight real mineral specimens that cover the Mohs hardness scale from 2 to 9, chosen for classroom scratch tests. Students test each one with a fingernail, a copper coin, a steel nail and a glass plate, then put them in order using their own evidence.
- 2 Selenite (gypsum), round 4" bowl
- 3 Honey calcite, rough chunk 2-4"
- 5-5.5 Lapis lazuli, rough chunk 2-4"
- 6-6.5 Labradorite (feldspar), rough chunk 2-4"
- 7 Clear quartz, small cluster
- 8 Spinel crystals in marble (two hardnesses in one rock)
- 8.5 Alexandrite (chrysoberyl), 1 g bag of tiny crystals
- 9 Sapphire (corundum) crystal, 3 to 4.9 g
Most school rock kits stop at quartz (7). This set adds spinel, chrysoberyl and sapphire so a class can work the hard end of the scale too. Every piece is natural, so sizes and colours vary.
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