STEM toys
Mohs Hardness Test Kit — 10 Mineral Samples with Porcelain Streak Plate
4.1
9 reviews
A complete Mohs hardness kit that supplies ten labeled mineral specimens spanning the scale, an unglazed porcelain streak plate, and a compact carry case with compartments. Geared toward classrooms, hobbyists, and field ID work, it includes a simple instruction card for scratch testing, sorting, and