moqui marbles, utah Iron oxide concretions (Moqui marbles) Moqui Marbles, hematite concretions, from the Navajo Sandstone of southeast Utah. Scale cube, with "W", is one centimeter square. The Navajo Sandstone is also well known among rockhounds for its hundreds of thousands of iron oxide concretions
The surface texture of this vase was hand formed with a porcelain slip, which under stress creates a unique crackle effect that reveals the rich clay below. Each tree is hand sculpted, attached, undercut and treated with an iron oxide wash to create shadow and depth.