"Rock Specimens"

Chlorite-bearing.

Dark, coarse-grained, and composed chiefly of hornblende.

Gray andesite with phenocrysts of felspar and/or hornblende.

Sawn and lacquered slab showing thinly bedded truncated layers in a well-cemented sandstone. Large hand specimen.

Classic, dark; from the Columbia Plateau.

Lustrous, black 'hard coal'.

Black, soft; most widely mined.

Cemented glacial gravel.

Small, rounded pebbles and tightly cemented granules.

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.

Introduce your students to rocks formed from deposition of sediment.

Coarse grained and abundant in plagioclase feldspar.

Volcanic glass with snowflakes embedded throughout.

Use these thin-section slides with a polarizing microscope to view rock specimens in detail. Includes: biotite granite, olivine basalt, red sandstone, encrinal limestone, mica schist, augen gneiss, storage box and identification guide.

Note: collections are subject to change depending upon availability of individual items. Set of six.

Shows porphyritic texture in a fine dark matrix abundant large feldspar phenocrysts. Hand specimen.