Collection: Geodes and Thundereggs from around the world - a treasure-box of crystals!
Geodes are hollow rocks with crystals grown inside them!
Classic localities for geodes are found in Illinois, Iowa, Indiana and outside the US such as Mexico and Brazil. Most geodes are sedimentary, while thundereggs are volcanic. Many geodes have a single layer or multiple layers of agate or chalcedony, and then crystal formations such as quartz crystals, and you get to the center of the geode. Sometimes many different types of crystals will form as the chemistry in the interior changes. Secondary mineral crystals can include sphalerite, millerite, chalcedony, and different colors of agate layers.
Thundereggs are usually solid with layers of color agate filling the egg.
Thundereggs are solid balls of rock that have chalcedony agate and sometimes crystals in side. Thundereggs are formed very differently than geodes. Classic localities for thundereggs are in Oregon, Utah, Washington state and Montana and South Dakota. Most thundereggs are solid, but occasionally will have a small hollow that has space for crystal formations of secondary minerals.

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Agate: Rare 'Orange Star' Thunderegg half from Hermanas, New Mexico
Regular price $75.00 USDRegular priceUnit price / per -
Agate: Puma Agate with quartz from Mendoza, Patagonia Argentina
Regular price $15.00 USDRegular priceUnit price / per -
Agate: Thunderegg half-round from Agate Creek, Queensland, Australia
Regular price $20.00 USDRegular priceUnit price / per -
Agate Slab - Large Blue Brazilian Agate Slab with blue banding and solid center.
Regular price $95.00 USDRegular priceUnit price / per -
Agate: Dryhead Agate slab from Big Horn River Montana
Regular price $35.00 USDRegular priceUnit price / per -
Agate: Dryhead Agate pair from Big Horn River, Montana
Regular price $95.00 USDRegular priceUnit price / per -
Agate Slab - Brazilian agate slab with solid crystal center
Regular price $25.00 USDRegular priceUnit price / per -
Agate Slab - Brazilian agate slab with crystal band and agate center
Regular price $25.00 USDRegular priceUnit price / per -
Agate Slab - Brazilian agate slab with crystal and circle banding
Regular price $40.00 USDRegular priceUnit price / per -
Agate Slab - Brazilian agate slab with crystal and agate center
Regular price $25.00 USDRegular priceUnit price / per -
Agate Slab - Brazilian agate slab with crystal band and agate center with druzy quartz
Regular price $25.00 USDRegular priceUnit price / per -
Agate Slab - Brazilian agate slab with large crystal center
Regular price $25.00 USDRegular priceUnit price / per -
Agate Slab - Brazilian agate slab with banding and secondary center
Regular price $25.00 USDRegular priceUnit price / per -
Agate: Fortification with black and white banding.
Regular price $12.00 USDRegular priceUnit price / per -
Egg - Rhodochrosite Pink Egg from Argentina
Regular price $45.00 USDRegular priceUnit price / per -
Egg - Rhodochrosite Egg from Argentina
Regular price $80.00 USDRegular priceUnit price / per