How do I identify a geode?

Recognizing Geodes. Look for rocks with a bumpy texture. When you’re searching, you want to look for lumpy rocks. Geodes have lots of bumps and texture to them, so steer clear of any rocks with a very smooth surface.

Is a geode rock worth money?

According to, 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.”

What do geodes look like in the ground?

Recognizing Geodes in the Field

Geodes are typically rounded, though not necessarily perfectly round. Sometimes they are shaped like an egg. They are almost never sharp. Look for a lumpy texture on the outside of the rock.

What kind of rocks are geodes found in?

Geodes can form in any cavity, but the term is usually reserved for more or less rounded formations in igneous and sedimentary rocks. They can form in gas bubbles in igneous rocks, such as vesicles in basaltic lava; or, as in the American Midwest, in rounded cavities in sedimentary formations.

Are diamonds found in geodes?

Typically, geodes do not have gold or diamonds in them. … Geodes are known to contain gems called Herkimer diamonds, Bristol Diamonds as well as Gold aura quartz, but they are not real gold or diamonds. Although certain quartz rock deposits have gold, it is different from the quartz crystals commonly found inside geodes.

What is the rarest geode color?

The rarest and most valuable geodes contain amethyst crystals and black calcite.

Can I find geodes in my backyard?

Geodes are found throughout the world, but the most concentrated areas are located in the deserts. Volcanic ash beds, or regions containing limestone, are common geode locations. There are many easily accessible geode collecting sites in the western United States, including in California, Arizona, Utah and Nevada.

How do you tell the difference between a rock and a crystal?

A rock is any two or more minerals bonded together, while a mineral is a naturally occurring inorganic element. A crystal refers to the structure of a mineral, and there are many different kinds of crystalline structures. A mineral can be part of a rock, and a crystal can be a mineral, but the terms are not synonymous.

What is the difference between a geode and an agate?

A nodule is something roughly spherical deposited in a matrix. When the nodule has a cavity it is a geode. … Often Chalcedony will deposit as a nodule or a geode. When the Chalcedony is banded it is an agate, although some chalcedonies that aren’t banded are still called agate, like moss agate, fire agate, etc.

How do you tell if a rock is a geode without breaking it?

The only way to find out for sure if a rock is a geode is to break it apart by tapping it with a hammer, or have someone cut open the rock with a powerful saw. You’ll know once you see the interior and whether or not there is a hollow or solid composition.

How do I know where to dig for crystals?

Areas on the planet’s surface that show clear evidence of fault lines and uplifts offer an ideal location to hunt for crystals. Check the area for ribbons of white quartz, which can also be found near known granite and gold deposits.

How do you find gems in a river?

The easiest way to collect gemstones is to discover stones on the surface of a dry riverbed. Prospecting in rivers can also be productive. In many cases, alluvial deposits are found below the surface and a great deal of manual labor is required to extract the rock and soil in order to examine it for gemstones.

What is the best way to break open a geode?

A very simple way to break a geode is simply to place the geode inside of a sock or fabric bag to contain the soon to be broken pieces. With the geode in a bag, gently striking the geode with a rock-hammer, sledgehammer, or even a harder rock should facture the geode just enough to break it open.

How do you open a geode at home?

How do you open a geode without a chisel?

Sledgehammer Method. Put the geode in a sock and set on the ground. Take a small Sledgehammer or a rock hammer (preferably not a construction hammer, such as a claw hammer) and strike the top center of the geode. A couple of strikes might be required to fully break open this rock.

How old are geodes?

Although the geode is embedded in rocks that are about 250 million years old, the crystals themselves are much younger than that. Radioactive dating of some of the oldest suggests they formed less than 5.6 million years ago but probably no more than 2 million years ago, the researchers report this week in Geology .

How can you tell a geode from the outside?

Geodes will typically not present with a smooth outside surface. What you’ll typically find on a geode is a bumpy, uneven surface. Sometimes you can even find them with nodule like bumps on the outside surface. If it’s smooth, then most likely what you have is not a geode.

How do you break a geode in the microwave?

Is Earth a geode?

Geodes are rocks that are plain on the outside but can have beautiful crystals on the inside. In the Greek language, geode means “shape of the earth”, and geodes are round like earth or oblong like an egg. They can be a couple inches or several feet in size.

How big is the biggest geode?

390 cubic foot
The Pulpi Geode In Spain

Located in an abandoned silver mine near the town of Pulpí, Spain this massive, 390 cubic foot (11 cubic meter) geode is said to be the largest in the world. It is 26 feet long, 6 feet wide, 5.5 feet high and lined with massive selenite crystals up to 6 feet long.

Do geodes keep growing?

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.

What is the liquid inside a geode?

Geodes have water in them due to the slow, silica-rich liquid permeating in and out of the cavity. As the layers slowly build up over time, the water gets trapped inside the geode.

Can you make geodes at home?

Natural geodes are hollow rock formations that contain deposits of crystals. Assuming you don’t have a geological timeframe to obtain a geode and don’t want to buy a geode kit, it’s easy to make your own crystal geode using alum, food coloring, and either plaster of Paris or an eggshell.

How long does it take for a geode to form?

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!

Are geodes water safe?

Geodes are usually in granite and if you look at the chemical composition of that you do see a few minerals that can slowly dissolve in water. So safe unless you need to maintain very soft water.