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A geode or druse is a hollow or partially hollow, globe-shaped nodule that is covered with crystals on the inside. Geodes are usually between 2.5 and 30 centimeters in size, but this can vary greatly. They are found in sedimentary rocks and are sometimes very expensive. A geode consists of a thin but tight outer layer of silicates, usually filled with a layer of quartz crystals such as amethyst or smoky quartz, but it can also contain rutile or calcite. There are also specimens whose cavity contains water. They are said to have formed as "bubbles" in the liquid magma that rose in a crater pipe during an eruption. Just as bubbles collect in boiling milk under the film that forms on the milk, gas bubbles remain stuck in the magma. These gas-filled cavities remain after the magma has solidified and fill with saturated mineral solutions. A geode forms as a layer of silica in a host chamber, usually a fossil cavity in the rock. The minerals in the water that flows along the hardened outer shell form crystals in the silica layer. Crystals then slowly grow in the cavities. Agate is formed in the same way. If you weigh geodes and compare their weights, the lightest in weight can sometimes contain beautiful crystals. Geodes are sawn or broken in half with special pliers to reveal the interior.