Cleavage direction | Description |
One cleavage direction | sheets or glitter |
Two cleavage directions | columns |
Three cleavage directions | cubes (can be rhombic) |
Four cleavage directions | pyramids |
Six cleavage directions | dodecahedrons |
Hardness Number | Mineral | Object Hardness Number | Household Object |
1 | Talc | ||
2 | Gypsum | 2.5 | Fingernail |
3 | Calcite | 3 | Copper penny |
4 | Flourite | ||
5 | Apatite | 5 | Window glass |
6 | Orthoclase Feldspar | 5.5 | knife blade (or nail) |
7 | Quartz | ||
8 | Topaz | ||
9 | Corundum | ||
10 | Diamond |