Geologists classify rock into igneous (basically volcanic), sedimentary (rock broken into small pieces and turned back into rock), and metamorphic (igneous or sedimentary rock changed by pressure and heat). We aren't geologists and we can't always differentiate rock into the three types. But we do love the different textures. Especially when we think about the age of some rocks.
While at the Oregon Coast recently, the texture of the rocks caught our eyes. Some places rough, some places fine. All of the textures constantly changing and evolving, facilitated by the movement of water and the grinding of one piece of rock against another. Just imagine the journey of a single rock. Out of the center of the earth, ground down to sand, buried under miles of other layers of sand and mud, then lifted up above the waves and exposed to the relentless force of wind and rain, only to be buried again, maybe heated, melted, squeezed by pressures of unfathomable force. When you think about them like that , there's no such thing as just another rock. No wonder the textures are so fascinating, they are the lines of age on the face of the planet.