A good rock is hard to find and a hard rock is good to find.
Show off your mineral knowledge with a shirt depicting the Moh's Hardness Scale. This scale is a helpful way to determine a mineral's identity based on the mineral's resistance to scratching, ie its hardness. 1 is the softest and 10 is the hardest.
Graphics include: (1) Talc (2) Gypsum (3) Calcite (4) Fluorite (5) Apatite (6) Microcline (7) Quartz (8) Topaz (9) Corundum (10) Diamond
For the mineral collector, crystal addict, science buff.
FREE SHIPPING! (when purchased with another item that requires a shipping cost, only that cost will be applied at checkout)
Standard adult sizes
100% HW preshrunk cotton
Machine wash cold, tumble dry low