Geodes are mostly found in deserts, volcanic ash beds and areas with limestone throughout the world. In the United States, common geode sites include Arizona, California, Iowa, Nevada and Utah. The most abundant geode sites in California are Riverside and Imperial counties.Know More
According to DesertUSA, one of the most popular geode areas is known as the Hauser Geode Beds, which are found at Wiley Well in Imperial Valley, California. Other well-known places with the finest concentration of geodes are the Cinnamon Geode Beds and the North Black Hills Geode Beds.
Geodes are found in volcanic rocks and sedimentary rocks such as limestone and dolomite. They form in sedimentary rocks when cavities are dissolved by ground water and minerals are deposited again as crystals. Additionally, they form in pre-existing concretions and spaces caused by expansion of rocks due to internal fluid pressure.
Geodes typically have minerals like carbonates, a crystal lining of quartz and an outer shell of chalcedony. Their size often reaches over a meter in diameter. Geodes made of dolomite and calcite have been found in sedimentary rocks in the Muswellbrook-Singleton region in New South Wales. According to the Australian Museum, volcanic geodes made of chalcedony, calcite, agate and amethyst quartz have been found in several regions in Queensland, New South Wales and Victoria.Learn more about Geology
Pegmatite is found in all parts of the world, and they are most abundant in very old rocks. Some are found in large intrusive igneous rocks, while others are distributed in the rocks surrounding the intrusive igneous rocks.Full Answer >
Copper, the oldest metal known to human beings, is found in ore deposits throughout the world, with the largest production occurring in Chile and the United States. Humans discovered copper about 10,000 years ago. It was first combined with tin to form the alloy bronze in about 3,000 B.C.Full Answer >
Jasper derives from quartz; the mineral is found throughout the world and is not commonly treated or enhanced when mined. Jasper is a beautiful mineral with captivating color patterns and formations. Although it can be solid in color, jasper is typically spotted, striped or ringed. Each jasper stone possesses a unique pattern or color scheme, making it one of the most unique gemstones.Full Answer >
Natural quartz is found in many countries and geologic locations, including the United States, Mexico, Brazil, Uruguay, Russia, France, Namibia and Morocco. Quartz is the second-most abundant mineral in the Earth's crust, and different types of quartz are found in different areas of the world.Full Answer >