It's not a term I recognise from any caving literature but it may mean one particularly rich in calcite or other mineral deposits. Cavers usually describe such places as "decorated" with an adverb such as "well", "richly" or beautifully".
There is a show-cave called Crystal Cave in the US _ I think New York State but I may be wrong on that detail.
In the Crystal Cavern.
The Zula Patrol - 2005 Mine Shaft The Crystal Cavern was released on: USA: 16 June 2008
theres a gig rock in the middle of the cave click on it
you find it in the ice cavern east of mahogany town dont know exactly where but it is in there.
I'll explore this cavern when I have a flashlight.
In the year 2000, miners were working in the Naica silver mine and broke through the walls of the cavern. They were astounded to discover these enormous crystals; the biggest anywhere on Earth.
Cavern is a noun.
In Kingdom Hearts II Final Mix, Frost Crystal (shard) can be found in a chest at the Cavern of Remembrance: Depths.
The suffix for cavern is -ous, as in cavernous.
Cavern Creatures was created in 1983.
Cavern Creatures happened in 1983.
Space Cavern was created in 1980.