Why there's no single term:
* Variety of crystals: The type of crystal lining the rock can vary greatly. It could be quartz, calcite, amethyst, or many others.
* Formation process: Crystals can form within the rock itself, or they can be lining a cavity or a void.
* Size and arrangement: Crystals can be tiny and scattered, or large and well-formed.
Possible terms:
* Geode: This is a specific term for a rock with a hollow cavity lined with crystals.
* Druse: Refers to a layer of small, closely spaced crystals, often covering the inside of a geode or a rock surface.
* Crystal-lined cavity: This is a general description that's accurate for many types of rock formations.
* Crystal-rich rock: This term is broad but describes a rock with a significant amount of crystals.
* Specific names: Depending on the type of crystal, you might use specific terms like "quartz-lined rock" or "amethyst geode."
To get a more precise description, you need to consider:
* The type of crystal: What kind of crystal is lining the rock?
* The rock type: What type of rock is the crystal lining?
* The formation: How did the crystals form in the rock?
Let me know if you can provide more details about the rock you're describing, and I might be able to give you a more specific answer.
