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Answer for the clue "Thunder egg ", 5 letters:
geode

Alternative clues for the word geode

Word definitions for geode in dictionaries

Wikipedia Word definitions in Wikipedia
Geodes ( Greek γεώδης - ge-ōdēs , "earthlike") are geological secondary structures which occur in certain sedimentary and volcanic rocks . They are themselves of sedimentary origin formed by chemical precipitation. Geodes are essentially hollow, vaguely ...

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
rounded stone with a hollow center lined with crystals, 1670s, from French géode , from Latin geodes , from Greek geodes "earthy, earth-like," from ge "earth" (Homeric gaia ; see Gaia ) + -oides , adjective suffix, "characterized by." Perhaps so called ...

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.