speleotheel
Speleotheel is not a widely recognized term in geology or speleology. There is no standard definition or formal entry for this word in conventional reference works. In many cases, readers encounter it as a misspelling or casual variant of speleothem, the term for mineral formations that occur in caves.
If the intended meaning is related to speleothems, the term would refer to the same natural phenomena
In fictional or coined-use contexts, speleotheel could be employed as a proper noun or a invented concept