Black Slate Landscape Chips Decorative Chips - Flagstone - Landscape Boulders Black Slate from the California Mother Lode Gold Country Chili Bar Slate is one of the most sought after types of slate in the Western U.S.A black slate durable enough to endure the harshest elements outside, yet beautiful enough to be part of an upscale building interior decor. It has a rich, dark gray to black color that adds depth and visual appeal anywhere it is placed. Decorative slate chips are a beautiful way to enhance a landscape. Chili Bar slate chips serve a variety of purposes, though you might have seen these rocks enhancing landscaping designs. Boulders come in all shapes and sizes; no two are alike.