its called a Geode.
They're called geodes. Basically, they're cavities in the molten material (magma) in the form of gas bubbles. The mineral rich solution seeps in and crystallizes and grows until all the solution is exhausted. That's why sometimes you'll end up with a crystal filled cavity and other times the whole void is filled in with interlocking crystals.
Methamorpic Rock .
A geode starts out as basically a cavity or pocket in otherwise solid rock. The cavity walls grow inward as mineral crystals grow from solutions that seep into it. In time, the cavity may become completely infilled with mineral crystal. The geodes that are found on the surface are survivors of weathering which eroded the rock in which they were once emplaced. This is because the geodes are composed of minerals such as quartz which are more resistant to erosion than the rocks which originally surrounded them.
Interlocking rocks are basically crystals. They form together and make crystals. So that's were crystal come from in most shops. So now you know that an example of an interlocking rock is a crystal
Rock Crystal
Vesicle
This can be called a vug, or vugh, or pocket, or geode. Whatever you call it, it's what keeps rockhounds up at night.
A natural quartz crystal ball is an expensive item to purchase, and a difficult one to find. One can find one at Bey's Rock Shop, The Magickal Cat, and Best Crystals.
A crystal ball is a sphere made of crystal and is used by wizards to look into the future.
Rock Crystal - novella - was created in 1853.
They're called geodes. Basically, they're cavities in the molten material (magma) in the form of gas bubbles. The mineral rich solution seeps in and crystallizes and grows until all the solution is exhausted. That's why sometimes you'll end up with a crystal filled cavity and other times the whole void is filled in with interlocking crystals.
Vug
Please further define what you mean by 'crystal rock'.
Pokemon liquid crystal how to get rock smash
If you are looking for a REAL Crystal Ball cut from quartz or other gemstones, rather than just a glass sphere, check out ROCK STAR CRYSTALS. They not only have real quartz crystal balls in a wide variety of sizes and prices, they also have the largest selection of gemstone spheres in other minerals in NYC!
....rock filled rapids.
leaves a hole, or cavity, in the rock.