Because they can take long to form resulting in a large crystal well-formed. And also remeber fast forming Crystal =small, slow forming Crystal =large
The crystals have abundant room to grow in their hollow surroundings.
The crystals have abundant room to grow in their hollow surroundings also the crystals can form very easily in many places.
no
nut
Crystals inside geodes will vary in color for a number of reasons. The solutions inside a vug may consist of varying concentrations of different mineral solutions. The mineral crystals that form from these solutions may have a specific color associated with them, such as malachite (green), azurite (blue) or rhodoschrosite (pinkish-red). Minerals that normally have a clear crystalline structure may appear clear or be colored by small amounts of impurities such as iron. In other cases, the minerals inside a vug may be exposed to varying amounts of radiation which can affect their color.
Thunder Eggs are rocks containing crystals inside them. This is what makes them geodes.
The crystals have abundant room to grow in their hollow surroundings also the crystals can form very easily in many places.
== == It depends on what's inside. Large amethyst geodes can go for thousands. Baseball sized geodes with non-spectacular quartz or calcite crystals can be purchased for $4-$12. Geodes with uncommon minerals that are sold on mineral auction sites range in price from $30-$500. Golf ball sized geodes, uncracked, are sold for about $2 at shows.
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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.
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.
Geodes are often lined with quartz.
nut
A number of different minerals can be found within geodes, but they are mostly composed of quartz.
Crystals inside geodes will vary in color for a number of reasons. The solutions inside a vug may consist of varying concentrations of different mineral solutions. The mineral crystals that form from these solutions may have a specific color associated with them, such as malachite (green), azurite (blue) or rhodoschrosite (pinkish-red). Minerals that normally have a clear crystalline structure may appear clear or be colored by small amounts of impurities such as iron. In other cases, the minerals inside a vug may be exposed to varying amounts of radiation which can affect their color.
Thunder Eggs are rocks containing crystals inside them. This is what makes them geodes.
the only place i have found them in illiinois is inside of geodes.