Referència: 10131
Mohs hardness scale 40X40 mm. Box of 10 minerals
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Graduation:
- 1 Talc
- 2 Plaster
- 3 Calcite
- 4 Fluorite
- 5 Apatite
- 6 orthoses
- 7 Quartz
- 8 Topaz
- 9 Corundum
- 10 Diamond
10131