Thundereggs look like regular rocks from the outside, but contain intricate and colorful mineral patterns inside — often made of quartz, chalcedony ... the size of the crystals that form ...

Large crystals found in geodes and other rocks are relatively rare. Pink ChalcedonyA pink chalcedony shows off its beauty. Chalcedonies include many types of cryptocrystalline quartz gems and ...

Her current projects include a Siamese fighting fish the size of a grapefruit, sculpted in blue chalcedony from China, and a 15-pound quartz crystal, called Star Seeker, that she has been carving ...