How to Classify Rocks?

To help in your classification, you will want to note where the rock was found. If it was embedded in the ground and not transported to the location, the spot it was found can help in identification. You will want to take note of the color and texture of the rock. Does it have a porous surface? Does it seem to be a conglomeration of other rocks? You can then compare what you have found with rocks in a field guide.