General terms:
* Crystalline rock: This is a broad term for any rock composed of minerals with a crystalline structure.
* Geode: This is a specific type of rock that has a hollow cavity lined with crystals.
* Druzy: This refers to a coating of small, closely packed crystals that can be found on rocks, geodes, and other surfaces.
More specific terms:
* Quartz crystal cluster: This refers to a group of quartz crystals that have grown together, often forming a point or cluster.
* Amethyst geode: A geode lined with amethyst crystals.
* Calcite druzy: A druzy coating of calcite crystals.
Other terms:
* Crystal-lined: This is a simple and descriptive term that can be used to describe any rock with crystals lining its surface.
* Vug: This is a small, irregularly shaped cavity within a rock that may be lined with crystals.
The best term to use will depend on the specific type of rock and crystals involved.
If you can provide more information about the rock and the crystals, I can help you identify a more specific term.
