"Avantor"

Well-cemented, medium-grained orthoquartzite.

Chlorite-bearing.

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

Gray andesite with phenocrysts of felspar and/or hornblende.

Glossy green dunite (olivine) inclusion in non-genetically related basalt. Average size: 3" x 4".

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.

Beautifully polished and distinctive slabs or rare 2.3 billion year old fossil stromatolites. Well defined growth structures in matrix.

Formalin preserved pig brain. Available in jars.

Formalin Preserved without Color Injection

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