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Unbroken Geode

PRODUCT TYPE: Rocks & Minerals

Geodes are hollow rocks that often contain mineral formations.

As with many geological formations, geodes often start with volcanic activity. But the geode is not formed by the volcano itself, but rather a void that it leaves behind.

When lava cools, it often contain air pockets. After the surrounding material hardens into rock, mineral-rich groundwater slowly feeds silicas into the void where they are deposited, little by little, over eons. Since these mineral deposits are often homogeneous, crystalline structures are allowed to form. As the surrounding bedrock erodes, the geode is freed from its formation strata.

Many geodes contain quartz crystals, but there is a small chance they could contain another crystal type. There is no way of knowing until they are opened. The contents and structures in a geode are entirely unique and have never been seen by anyone until you break it open.

To break open a geode we recommend putting it in a bag to contain any flying debris and hitting it with a hammer. Be sure to wear safety glasses just in case!


Small and medium geodes in the bag are appro ximately 1"-2.5"

Large geodes are approximately 2.5" and up 

$13.50

Bag of 5- Small & Medium Geodes
Single Large Geode

Pickup available at our Tulsa Storefront

Usually ready in 24 hours

Unbroken Geode

Bag of 5- Small & Medium Geodes

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GEODE

Geodes are geological secondary formations within sedimentary and volcanic rocks. Geodes are hollow, vaguely spherical rocks, in which masses of mineral matter (which may include crystals) are secluded. The crystals are formed by the filling of vesicles in volcanic and sub-volcanic rocks by minerals deposited from hydrothermal fluids; or by the dissolution of syn-genetic concretions and partial filling by the same, or other, minerals precipitated from water, groundwater or hydrothermal fluids.

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. After rock around the cavity hardens, dissolved silicates and/or carbonates are deposited on the inside surface. Over time, this slow feed of mineral constituents from groundwater or hydrothermal solutions allows crystals to form inside the hollow chamber. Bedrock containing geodes eventually weathers and decomposes, leaving them present at the surface if they are composed of resistant material such as quartz. When cut in half, visible bands corresponding to varied stages of precipitation may at times show patterns that reveal points of fluid entry into the cavity and/or varied colors corresponding to changes in chemistry.

Geode banding and coloration is the result of variable impurities. Iron oxides will impart rust hues to siliceous solutions, such as the commonly observed iron-stained quartz. Most geodes contain clear quartz crystals, while others have purple amethyst crystals. Still others can have agate, chalcedony, or jasper banding or crystals such as calcite, dolomite, celestite, etc. There is no easy way of telling what the inside of a geode holds until it is cut open or broken apart. However, geodes from a particular area are usually similar in appearance. Geodes and geode slices are sometimes dyed with artificial colors. Samples of geodes with unusual colors or highly unlikely formations have usually been synthetically altered.

CUSTOMER REVIEWS

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H
H.S. (Pennsylvania, United States)
Ode to the geode

A nice bunch of small geodes… always fun to smash stuff and the sparkly interior is an added bonus. Exactly as advertised with quick shipping. Thanks so much!

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Unbroken Geode

Unbroken Geode

$13.50
Bag of 5- Small & Medium Geodes
Single Large Geode