Vonsen Blue Jade Pebble #17.

Whole Nephrite Jade pebble from Marin County California near Petaluma.

Polished in a cement mixer by the miners.

Has some interesting dendritic features.

Small deposit has been mined out for many years.

Jade weighs 20 grams.

Measures 39mm x 25mm x 16mm.

The last photograph shows this Jade stone next to a ruler.