geode

• Concreção rochosa oca, geralmente esférica, cujo interior é revestido por cristais ou outro material mineral.

A hollow, often spherical rock or mineral nodule whose interior cavity is typically lined with crystals or other mineral matter.

1. Hollow rock with crystalsC1formalscientific

   A hollow, usually spherical rock or mineral nodule, the cavity of which is lined with crystals or other mineral matter.

   Pedra oca com cristais

   • The geode was split open to reveal a stunning array of amethyst crystals.
   • Collectors prize geodes for their beautiful internal crystal formations.
   • Geodes often form in volcanic or sedimentary rock environments.