Rock Cycle - Rocks (2) Quantity in Basket: none Code: RC-R2 Price: $10.75 Shipping Weight: 2.00 pounds Quantity: The 3 different types of rocks while increasing observational skills. Module includes a piece of chert, marble, schist, sandstone, shale, serpentinite, coal, obsidian, pumice, granite, scoria, and conglomerate. (code RC-R2)