Oligocene. John Day Formation. South Fork of the Crooked River, Crook County, Oregon

9.4 x 1.8 x 1.4 cm
The average diameter of tehe cast is approximately 1 cm. The two dimensions for the width of the specimen included the curve of the specimen and the side branch.

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Ex. Robert Gannon

This is an example of where a limb of wood was encased in mud and then decayed leaving a cast which was later filled with Chalcedony. The location is rather famous for these limb casts. What makes this specimen particularly interesting is it is a long, thin, small branch which is unusual since most specimens found are much thicker. The exterior is covered with a thin layer of a light green material. The interior is actually a light pink color but because the Chalcedony is nearly transparent, it picks up the green color from the exterior. The thicker end of the specimen has been highly polished with a convex surface.

Condition: Excellent

Flaws: Nothing Appreciable

This mineral is also found in the following galleries: Minerals From the United States | Quartz | Pseudomorphs | Polished & Worked | Minerals Priced Between 50 and 99 Dollars