Mountain Gray Granite Boulders Mountain Grey Rock is naturally harvested from riverbeds where these granite beauties have been lying just waiting to awaken your landscape project with their charm.
Mountain Grey Rock is a unique cobblestone that is harvested from the rivers in the San Gabriel Mountain Range. Centuries of roaring white water flowing down the rivers and creeks and cascading into stream beds have made these rocks into semi-smooth river distinctive river cobbles. This rock has become a popular choice throughout California. Mountain Grey Rock is Southern California's own spectacular grey granite river cobblestone.