In general, mineral particles are small, having formed within confined areas such as lava flows or between grains of sediments. Large crystals found in geodes and other rocks are relatively rare.

Montana is called the Treasure State for a reason, known for its thousands of years of mining history and over five hundred mineral specimens.

These geodes contain a wide variety of Minerals. It's one of the helmets commonly worn by dwarves. The thick metal plating protects them from falling debris and stalactites.

Every April for the past 20 years, a wide range of rocks, minerals ... Vice President of the Gem and Mineral Society. "It's like breaking open a geode, no two are ever the same.