"Freeze-Dried Specimens"

Shiny black volcanic glass showing conchoidal fracture and some spherulites.

Dark gray with abundant gas pocket vesicles.

Volcanic glass with snowflakes embedded throughout.

Pale pink felsite, with small sanidine phenocrysts.

Gray, fine, friable, with abundant small sanidine crystal fragments.

Grayish black trap rock.

Glassy; most specimens float in water.

Gabbro is Mafic igneous rock formed deep underground consisting of olivine and pyroxene.

Anorthosite is an intrusive, igneous rock consisting of predominantly plagioclase feldspar.

Sale

Samples of Intrusive and Extrusive Igneous Rocks