"Dessus de bouchon"

Chlorite-mica with perfect slaty cleavage.

Abundant small black phenocrysts in a gray to brown matrix.

Study the Formation of Different Igneous Rocks

Shiny black volcanic glass showing conchoidal fracture and some spherulites.

Red-brown to gray, coarse-grained, containing feldspar and mica.

Dense and massive.

Typical green-gray, fissile, clay-rich.

Red, medium, to coarse-grained iron oxide cement; shows hematite bands.

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

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

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

Includes: six each of conglomerate, sandstone and shale. Set of 18.

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