Trapper Creek Dendritic Agate pendant, earrings and ring. Trapper Creek Agate is found in Wyoming and occurs on the lower elevations of the Big Horn Mountains.
The stone’s inclusions, called “dendrites,” are a mixture of manganese or iron oxide minerals that were trapped inside the gemstone when the agate formed.
When a white agate features black dendrite inclusions, the effect emulates a striking wintery scene of snow blanketing tree branches. There are a few ways to identify a dendritic agate, but the easiest method is looking for its distinct tree-like inclusions. While scenic and moss agates also depict nature scenes, dendritic agates have a signature black and white contrast.
Dendritic Agate: Composition, Properties and Uses – Geology In