How can you tell a natural geode?

If the rock feels lighter than that surrounding rocks, it may be a geode. Geodes have a hollow space inside, which is what allows the crystals to form. You can also shake the rock next to your ear to test whether it is hollow. You may hear small pieces of rock or crystal rattling around inside if it is hollow.

Can geodes be solid?

Facts About Geodes Geodes are hollow within, while nodules are solid. Both can contain crystals and other substances.

Are geodes deposited by water?

The water lines a thin crust of minerals inside of the cavity. As water flows through the geode, additional mineral layers are deposited in its hollow interior. Over thousands of years, these layers of minerals build crystals that eventually fill the cavity.

What is a natural geode?

A geode (/ˈdʒiːoʊd/; from Ancient Greek γεώδης (geṓdēs) ‘earthlike’) is a geological secondary formation within sedimentary and volcanic rocks. Geodes are hollow, vaguely spherical rocks, in which masses of mineral matter (which may include crystals) are secluded.

What is the difference between a geode and a thunder egg?

A geode is a simple term for a rock with a hollow in it, often with crystal formation/growth. A thunderegg on the other hand is a specific geological structure.

How many years does it take to make a geode?

How long does it take for a geode to form? Over thousands of years, these layers of minerals build crystals that eventually fill the cavity. How long this takes depends on the size of the geode. The largest crystals can take a million years to grow!

Can diamonds form in geodes?

Typically, geodes do not have gold or diamonds in them. The type of rock formations usually associated with gold is quartz, and with diamonds its kimberlite. Although certain quartz rock deposits have gold, it is different from the quartz crystals commonly found inside geodes.

Are geodes worth money?

According to Answers.com, the value of a geode “… 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.”