Geode Nodule
Geode Nodule
Geodes are oblong shaped rocks, which contain a hollow cavity lined with crystals. Some of the crystals which form on the inside of geodes can contain clear, pure quartz crystals and others have purple amethyst crystals, although agate, chalcedony, and such minerals as dolomite and calcite are also formed. Geodes form in the hollow areas of sedimentary rocks, animal burrows, tree roots, and can be formed as bubbles in volcanic rock. Overtime dissolved minerals seep into the hollow areas and harden, creating the geode. As layers of silica cool, crystals of different minerals begin to form within the cavity walls. When a geode is completely filled with crystals it's called a nodule. Geodes are formed throughout the world, but most are found in formations located in the deserts volcanic ash beds, even in limestone. Many geodes are found in the U.S.A (California, Arizona, Indiana, and many other locations) in fact the geode is Iowa's state rock.
Geode Nodule
Geodes are oblong shaped rocks, which contain a hollow cavity lined with crystals. Some of the crystals which form on the inside of geodes can contain clear, pure quartz crystals and others have purple amethyst crystals, although agate, chalcedony, and such minerals as dolomite and calcite are also formed. Geodes form in the hollow areas of sedimentary rocks, animal burrows, tree roots, and can be formed as bubbles in volcanic rock. Overtime dissolved minerals seep into the hollow areas and harden, creating the geode. As layers of silica cool, crystals of different minerals begin to form within the cavity walls. When a geode is completely filled with crystals it's called a nodule. Geodes are formed throughout the world, but most are found in formations located in the deserts volcanic ash beds, even in limestone. Many geodes are found in the U.S.A (California, Arizona, Indiana, and many other locations) in fact the geode is Iowa's state rock. 
0 comments:
Post a Comment