granite- sierra boulders Sierra Boulders are from the Northern California Sierras. The colors range from a white yuba quartz to gray color with rust splashes. There are green lichens present on many stones. Sierra boulders are available in headsize. Boulders come in very unique shapes and sizes from 300–6,000 lbs. They are used for walls, ponds, borders and feature boulders. AVAILABLE SIZES DESCRIPTION THICKNESS COVERAGE AREA Baskets - Head Size 6" – 12" 45 – 55 sf /ton Baskets - Double Head Size 12" – 18" 35 – 45 sf /ton Landscape Boulders 500 to 6,000 lbs