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Glossary · Minerals

Geode

A hollow, roughly spherical rock cavity lined with crystals (quartz, amethyst, calcite) that grew inward from the walls; formed in gas bubbles in lava or in dissolved concretions in sediment.

A hollow, roughly spherical rock cavity lined with crystals (quartz, amethyst, calcite) that grew inward from the walls; formed in gas bubbles in lava or in dissolved concretions in sediment. Cut or cracked open to display.

Sources

Cite this article

Stratum Strata. "Geode" (Glossary). Stratum Strata pack 2026.09, as of 2026-09-16. https://stratum.black/strata/glossary/geode. Accessed 2026-09-21.

BibTeX · CSL-JSON

@misc{stratum-geode,
  title        = {Geode},
  author       = {{Stratum Strata}},
  howpublished = {\url{https://stratum.black/strata/glossary/geode}},
  year         = {2026},
  note         = {Glossary article, Stratum Strata pack 2026.09, as of 2026-09-16; sources: stratum. Accessed 2026-09-21.}
}

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