The choices here are:
a. harder c. more dense b. shinier d. more reactive
The answer is "harder".
The Moh's Scale is also known as the Mohs scale of mineral hardness. This scale is basin gon the ability of one certain material to visibly scratch another material. 1 Talc 2 Gypsum 3 Calcite 4 Fluorite 5 Apatite 6 Feldspar 7 Quartz 8 Topaz 9 Corundum 10 Diamond.