
Crystals are made up of minerals that have melted, cooled, and hardened into distinct shapes with regular repeating patterns. This informative book takes a look at the underground process that creates these fascinating geometric minerals, from sparkling quartz to ordinary salt,...

Crystals are made up of minerals that have melted, cooled, and hardened into distinct shapes with regular repeating patterns. This informative book takes a look at the underground process that creates these fascinating geometric minerals, from sparkling quartz to ordinary salt,...