"gel box"

Gray to brown mudstone with abundant silt.

Banded volcanic glass.

Pale pink felsite, with small sanidine phenocrysts.

Glassy; most specimens float in water.

Gray with line crinoid columnal fragments.

Unpolished metamorphic rock with silky lusture, red-brown colour, and clear parallel intergrown quartz crystals.

Typical green-gray, fissile, clay-rich.

Developed by the National Association of Geology Teachers

An introductory rock set contains six samples from each of the three major rock types.

Ideal for Beginning Earth Science Students

Forty mineral thin sections for Petrography Studies

Sale

Examples of the most basic rocks and rock-forming minerals.

Perfect for Introductory Lessons on Metamorphic Rocks.

Survey set improves student's recognition of all three major rock groups.

Advanced study series of almost 100 specimens.

Black, fissile; commonly with carbonized fossil plant impressions.