"Freeze-Dried Specimens"

Fine to medium-grained with biotite.

Dark gray, composed mostly of pyroxene and olivine.

Study the Formation of Different Igneous Rocks

Coarse grained and abundant in plagioclase feldspar.

Classic, very coarse-grained igneous texture.

Medium-grained with biotite.

Light gray, with flow structure.

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

Introduce your students to rocks formed from the cooling of magma and lava.

Gray-to-brown basaltic, with over 50% vesicles.

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