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The presence of geodes appearing on the surface of a given locality is dependent on the geologic history of that area. Geodes are usually found in areas of exposed and eroded sedimentary rock. The shell of the geode, often quartz, weathers less vigorously than the entrapping rock, usually calcitic or dolomitic limestone. In northern lattitudes, glacial deposits may have covered up the geodes and sedimentary rock, or perhaps the sedimentary rock layer did not exist previously or has eroded away completely.
What else can I help you with?
Where to find geodes in Minnesota?
Geodes can be found in Minnesota in areas such as the North Shore of Lake Superior, particularly around the rivers and streams. Look for places with exposed bedrock or gravel bars where geodes may have eroded out of their surrounding rock. Always obtain permission before collecting on private or protected lands.
Is calcite in geodes?
Yeah calcite is in geodes. you can find some in stores or you can go on the internet and there is proof that there is calcite in geodes if you go to google.com and go to images and type in calcite in geodes ask wiki answers for more info :)!!!!
How big can geodes be?
Geodes can vary in size from just a few centimeters to several feet in diameter. Some exceptional geodes have been found to be even larger, reaching up to several meters in size. The size of a geode is dependent on factors such as the type of rock formation and the conditions under which it formed.
What are some basic facts about geodes?
Geodes are secondary structures that occur in sedimentary and igneous rocks. Geodes are hallow on the insde. They are spherical to oblate in shape. Most contain clear crystals, though some may contain colored crystals. Geodes are common in the U.S. states of Indiana, Iowa, Missouri, Kentucky and Utah, and the countries Mexico, Brazil, and Namibia.
Are geodes shiny on the inside?
Yes, when you break open a geode, the minerals on the inside have a shiny appearance, some moreso than others depending on their composition.
What are rattler geodes?
A rattler geode is a geode that has a crystal, or mineral, (rarely sometimes a mudball) rattling around inside. It is really cool to see a kids reaction to a "rattling rock"....Some of the rattlers are VERY loud, while others may be quite soft, depending on the size of the dislodged crystal, and the size of the hollow chamber.
What are some characteristics of cities locations?
Many cities are located in places that provide good transportation, such as on a river, lake or coast. Others are found in places with easy access to Natural Resources.
Could you tell me stuff about the rock Geode?
Geodes are rock cavities with internal crystal formations, usually made of quartz crystals. Some geodes are completely solid because they are filled with crystals. These are called "nodules". Geodes can form in gas bubbles in igneous rock, or in rounded cavities in sedimentary rock. Most geodes contain clear or white quartz crystals, but purple amethyst crystals are also common.
Why is wind a useful energy resource in some places but not in others?
Some places have more constant winds than others.
What are some characteristics of cities?
Many cities are located in places that provide good transportation, such as on a river, lake or coast. Others are found in places with easy access to Natural Resources.
What are some characteristic of cities?
Many cities are located in places that provide good transportation, such as on a river, lake or coast. Others are found in places with easy access to Natural Resources.
What are the hollow ball-like objects such as quartz which are found in sedimentary rocks?
Geodes. They can be found in some igneous rocks as well. They start as a hollow cavity created by a gas bubble or decaying organism. Mineral rich water seeps into the cavity and crystals form from the outside toward the inside.
