yes there are some rocks that are round called geodes these rocks are hollow on the inside and have crystals inside them
No
Grainy rocks not only absorbs water better than crystal rocks, but it filters the water as well.
Such rocks are porphyritic.
Porphyritic Rocks are rocks that have big and small crystal's like the Igneous Rock "Andesite".
crystal rocks, I guess.
Crystal
Yes, rocks can contain a variety of crystal sizes.
Diamond.A diamond is a crystal, and a crystal is a rock with neatly arranged atoms.
Gemstones are made of Crystal rocks
Crystal size in igneous rocks is controlled by the rate of cooling whereby the slower the rate, the larger the size of crystal.
I like crystal rocks. You see plain rocks everywhere, but crystals and gems are one of a kind
crystal rocks is melted magma that has cooled down and hardened