Crystal Caves: 2 Aquamarine Geodes Grow your own gorgeous crystals with the Crystal Caves: 2 Aquamarine Geodes kit from Kristal Educational. Fun and fascinating, this kit is an excellent gift for the budding scientist in your life. Beneath the rough, craggy exterior, the geode hides a glittering crystal interior. Each kit contains crystal-growing chemicals, casting plaster, crystal-growing containers, lids, and stirring rods. Additional items may be required. For ages 12 and up - Instruction booklet included