Oco Feather Agate Geode Pair #11

Mineral: Feather Agate (Chalcedony) with Druzy Quartz
Origin: Oco Geodes, Rio Grande do Sul, Brazil

This natural Oco geode pair features delicate feather-like agate formations surrounding sparkling druzy quartz-lined cavities.

Formed within volcanic rock, Oco geodes are known for their compact size, intricate fortification banding, and highly detailed crystal interiors. Over time, layers of microcrystalline quartz developed along the cavity walls, creating the flowing plume and feather structures visible throughout the agate.

The open cavities later allowed silica-rich fluids to crystallise into fine druzy quartz, producing the sparkling internal texture seen within both halves.

These specimens display soft neutral tones ranging from smoky grey and cream to warm caramel and translucent honey hues, with dramatic swirling feather formations framing the crystal centres.

Each pair is unique in structure, banding, druzy development, and plume formation.