Identify Your Rock: Key Mineral Traits (With Photos)
For instance, quartz can be clear, pink, or even purple. So, while color is a helpful clue, it's best to combine it with other identification methods. How to determine or use color to identify a rock ... Next, see if the grans are smooth and rounded or if they have sharp edges. Some rocks, like sandstone, have tiny, round grains. Others, like ...
