![Natural Rock with Irregular Surface with Different Shades. Stock Image - Image of bottom, material: 151403549 Natural Rock with Irregular Surface with Different Shades. Stock Image - Image of bottom, material: 151403549](https://thumbs.dreamstime.com/z/natural-rock-irregular-surface-different-shades-rocky-wall-hardness-where-parts-hardest-stand-out-thus-forming-151403549.jpg)
Natural Rock with Irregular Surface with Different Shades. Stock Image - Image of bottom, material: 151403549
If diamond is the hardest rock on earth (and hard by definition is solid, firm, and resistant to pressure; not easily broken, bent or pierced), and it can break with a hammer
![Small piece of the hardest kind of granite bed rock with its typical texture and color Stock Photo - Alamy Small piece of the hardest kind of granite bed rock with its typical texture and color Stock Photo - Alamy](https://c8.alamy.com/comp/W2RY16/small-piece-of-the-hardest-kind-of-granite-bed-rock-with-its-typical-texture-and-color-W2RY16.jpg)