20-Piece Igneous, Metamorphic and Sedimentary Rock Specimen Set in Laminated Box

This rock collection set contains 20 varied rock samples categorized into igneous, metamorphic, and sedimentary types. Includes one sample each of basalt, gabbro, granite, obsidian, pegmatite, pumice, anthracite, gneiss, marble, quartzite, serpentine, slate, chalk lumps, conglomerate, diatomite, flint, limestone, rock salt, sandstone, and shale. Supplied in a laminated compartmentalized die-cut box with each rock numbered to correspond with the included identification key. Suitable for geology classrooms studying rock identification and classification.