Igneous Rock Set 15, 1 Each

The United Scientific® Igneous Rock Set 15 by United Scientific is a boxed collection of igneous rock specimens for earth science classes, including granite, basalt, gabbro, rhyolite, obsidian and pumice. It covers both intrusive and extrusive rocks so students can compare crystal size and texture. Specimens average 2 cm x 3 cm x 1.5 cm and are identified by a key printed inside the box.