Spherical gas bubbles in a cavity filled with epoxy resin in a Colombian emerald

Spherical gas bubbles in a cavity filled with epoxy resin in a Colombian emerald. The size of the cavity means that the pressure between the epoxy resin and the gas bubble is almost in equilibrium, and the surface tension mechanism produces perfectly spherical bubbles. In cracks, the bubbles are generally flattened because they are in contact with both sides of the crack.

🔬 Micrograph: F. Notari.

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