"serv Dial Sud & sars"

Includes: six each of obsidian, pumice, and basalt. Set of 18.

Common rocks and minerals for testing and identification studies are 2–3cm each.

Dark gray, composed mostly of pyroxene and olivine.

Coarse-grained plagioclase and pyroxene with some olivine.

Coarse-grained, with microcline, biotite and horblende phenocrysts.

Coarse, 'salt and pepper': dark pyroxene and light andesine. Provides perfect representation of an intermediate igneous rock.