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Answer for the clue "Crystal-lined cavity ", 5 letters:
geode

Alternative clues for the word geode

Word definitions for geode in dictionaries

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Geode \Ge"ode\ (j[=e]"[=o]d), n. [F. g['e]ode, L. geodes, fr. Gr. ? earthlike; ge`a, gh^, the earth + e'i^dos form.] (Min.) A nodule of stone, containing a cavity, lined with crystals or mineral matter. The cavity in such a nodule.

Wikipedia Word definitions in Wikipedia
Geode may refer to: Bone cyst , also called geode Geode , geological rock formation Geode (trade association) , European gas and electricity distributors Geode (processor) , microprocessor series Mozilla Geode , geo-tagging project La Géode , an IMAX theater ...

WordNet Word definitions in WordNet
n. (mineralogy) a hollow rock or nodule with the cavity usually lined with crystals

Usage examples of geode.

Not the least curious part of this outcrop is the black thread of iron silicate which, broken in places, subtends it to the east: some specimens have geodes yielding brown powder, and venal cavities lined with botryoidal quartz of amethystine tinge.

The music swelled in a crescendo, cube-drums, ice-horns, percussion geodes, and more, all in perfect harmony.

Quantities of quartz crystals, geodes, apache tears, jasper pebbles, moonstone beads, and….

Treasure seekers of this kind found a stone that looked like a geode in 1961 near Olancha, on the edge of the Amargosa Desert.