Blue Moon Rock and DG Materials The saying "once in a blue moon" applies really well to this Northern California material, a crushed stone fine material that is an excellent hardscape, utility area and light vehicle pathway material. This material is more blue than our Blue Decomposed Granite but is a crushed stone fine, so a slightly different texture. Samples of the two are available. Northern California quarry shipping bulk throughout the region, the Central Valley and into the Reno Sparks metro region. SuperEarth-sack delivery anywhere requested. This "screened" gravel does not contain the large amount of fines the "minus" screen grade does. The screened material is about 90% 3/8" gravel offers a very clean look for planterbeds.