Quartzite is formed from sandstone that has been tightly compressed to the point where the clasts have recrystallized to form a new rock This formation mechanism, coupled the inherent strength of quartz, makes quartzite a very durable rock Useful in the classroom for lessons on metamorphic rocks Ideal for identification and classification exercises While each specimen will vary slightly in shape, size and color, it will measure approximately 1 inch in length The specimens are packaged in a transparent bag that is labeled and barcoded for easy identification and storage Each specimen is selected and hand processed by an actual geologist, ensuring that each sample exhibits defining features Rocks and minerals are sourced from a variety of locations around the world and are processed by hand in Victor, NY.