- Hardness collection with test kit for geological study
- Nine mineral specimens for testing on traditional hardness scale
- Number coded with key sheet for identification
- Compartmented tray for display and storage
- Test kit, with streak plate, glass plates, and nail, for hands-on learning
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American Educational Introductory Rock Collection
23.5018.29 -
American Educational The U.S. Mounted Rocks and Minerals Western Collection (Pack of 50)
32.5032.50 -
American Educational Rugged Polystyrene Rock/Mineral Specimen Collection Box, Cell Size 1.75" Length x 1.5" Height
19.5017.78 -
Hach 145400 Total Hardness Test Kit, Model 5-EP
34.550
