![]() Manganese produces pink coloration, while chromium and nickel result in green hues. If titanium is present, the colors will be in the blue family. If an abundance of iron oxide and cobalt are present, the colors will be red. The color of the agate depends on how the minerals are distributed inside of the stone. Generally, the agate layer supplies the majority of the geode’s color. Geode colors depend on the agate layer inside the rock and the type of crystals that form on the agate layer. Geodes: One of Nature’s Mysteries (PDF).Some geodes have tightly packed crystals inside of them, while others still have a cavity with crystals lining the interior surface. These layers include both agate and quartz. Over thousands and millions of years, layers form inside of the space. Tiny crystals remain inside the bubble sticking to the sides. Part of this mineral-rich water penetrates through the outer surface of the rock to the inside, which causes it to be trapped inside of the bubble. With the addition of moisture, chemicals are released into the water. With the formation of the rock, tiny air bubbles surrounded by the rock are initially hot. These hollows could occur from tree roots or from animal burrows underground. A geode begins as a hollow bubble located inside a layer of volcanic rock or another type of rock. The formation of geodes is complex, and the process occurs over an extensive period of time. Searching for these hollow rocks can be an elusive pastime, that might be enjoyed by anyone who likes studying and collecting rocks and minerals. However, cracking open a geode will display an array of colorful crystals. On the outside, geodes appear nondescript and are easily overlooked. A geode is a hollow rock lined with an inside layer of sparkling crystals.
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