Answer: geodes

AnswerCrossword Clue
GEODESHollow stones
geodeshollow nodular stone often lined with crystals
geodesa nodule of stone having a cavity lined with crystals or mineral matter
geodesGEODE, a type of rock
GEODESThunderegg cousins
GEODESDecorative rocks
GEODESCrystal-lined cavities
GEODESPetrified Forest souvenirs
GEODESShowcases of rock bands?
GEODESSome fancy paperweights
GEODESSome sparklers
GEODESCrystal-lined rocks
GEODESStone nodules
GEODESCrystal-lined stones.
GEODESHollow stones.
GEODESRocks lined with crystals.
GEODESStone nodules, containing crystals.
GEODESItems in some science museum gift shops
GEODESCrystalline stones
GEODESHollow, crystal-lined stones
GEODESHollow rocks
GEODESCrystal-lined stones