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All-natural sparkler, 5 letters
Crystal filled cavity, 5 letters
Crystal-bearing nodule of stone, 5 letters
Crystal-bearing rock, 5 letters
Crystal-center rock, 5 letters
Crystal-filled nodule, 5 letters
Crystal-filled rock, 5 letters
Crystal-filled stone, 5 letters
Crystal-lined cavity, 5 letters
Crystal-lined nodule, 5 letters
Crystal-lined stone, 5 letters
Hollow crystalline rock, 5 letters
Hollow crystalline stone, 5 letters
Hollow nodular stone, 5 letters
Hollow rock with crystals, 5 letters
Hollow stone, often crystal-filled, 5 letters
Hollow, crystal-containing rock, 5 letters
Hollow, crystal-filled rock, 5 letters
It has a crystal inside, 5 letters
It may be lined with quartz, 5 letters
Keeper for a rock collector, 5 letters
Mineral-containing stone, 5 letters
Rock containing crystal, 5 letters
Rock filled with sparkles, 5 letters
Rock full of crystals, 5 letters
Rock that glitters inside, 5 letters
Rock that's glittery inside, 5 letters
Rock with a crystal inside, 5 letters
Rock-hunter's treasure, 5 letters
Rock-shop curiosity, 5 letters
Shiny, hollow paperweight, 5 letters
Sparkly collectible, 5 letters
Sparkly paperweight, 5 letters
Stone lined with crystals, 5 letters
Stone nodule often containing crystal, 5 letters
The state rock of Iowa, 5 letters
Where to look for crystals, 5 letters
Crystal-filled rocks, 6 letters
Crystal-lined cavities, 6 letters
Crystal-lined rocks, 6 letters
Crystal-lined stones, 6 letters
Hollow, crystal-lined stones, 6 letters
Hollow, spheroidal rocks, 6 letters
Items in some science museum gift shops, 6 letters
Petrified Forest souvenirs, 6 letters
Showcases of rock bands?, 6 letters
Some fancy paperweights, 6 letters
Stones with crystals, 6 letters
Like Buckminster Fuller's dome, 8 letters
Like some architectural designs, 8 letters
R. Buckminister Fuller creation, 12 letters
Structure popularized by Buckminster Fuller, 12 letters
Memoir by Buckminster Fuller?, 10 letters
Science of earth measurement, 7 letters
Of the earth's curvature, 8 letters
Lined with crystals, 6 letters
Lined with crystals, perhaps, 6 letters
Of crystal-filled stones, 6 letters
It's actually a clam, 7 letters
Weighs up to six pounds, 7 letters
Has siphons that can extend to several feet and cannot be withdrawn into the shell, 7 letters