Origin: Oregon, USA

Description: This Rough Thunder Egg from Oregon, U.S.A. is intended for lapidary use, including cutting, slabbing, polishing, cabochon making, display faces, and collector projects. Thunder Eggs are rounded volcanic nodules that often contain agate, chalcedony, jasper, quartz, or druzy pockets inside. From the outside, they usually look plain, rough, and earthy, but once cut open they can reveal banding, colour zones, crystal pockets, mossy patterns, or scenic interiors.

Thunder Eggs are strongly associated with Oregon and are one of the state’s best-known lapidary materials. They formed in volcanic rock when gas pockets or cavities were later filled with silica-rich minerals such as agate, chalcedony, jasper, and quartz. Oregon Thunder Eggs are popular with rockhounds and lapidary artists because each piece cuts differently, making them good material for saw work, polishing practice, specimen halves, and one of a kind display pieces.

Thunder Eggs are often associated with grounding, protection, stability, and inner strength. Because they can look rough on the outside while holding colourful patterns inside, they are also commonly connected with patience, hidden potential, and personal growth. Agate-filled Thunder Eggs are often linked with steady, calm energy and practical focus.

Chemical Composition: SiO2

Grade: Semi Precious
Appearance: Translucent/ Opaque
Inclusions: 

Cost per Gram (Rough): $0.02
Size approximately 1 pc: 6cm x 5cm x 4cm 
Weight approximately 1 pc: 240g

Cost per Gram (1 Half Cut): $0.02
Size approximately 1 pc: 7cm x 5.5cm x 3cm
Weight approximately 1 pc: 198g

Rough is rough. We do our best to grade and describe pieces in the lot, but ultimately, they all differ.