Aluminum oxide, the most common industrial mineral in use today ... Olivine is dustier than garnet and tends to fracture more easily. Pumice Abrasive grain or finishing media consisting of pumice.

Just a few minerals make up most of the rocks we see, though: feldspars, amphiboles, quartz, olivine, garnet, micas, calcite, and pyroxenes. The possible combinations of these minerals are endless.

“We have rock, mineral, fossil, gem and shell specimens ... New for the 2024 sale are samples of garnet in the volcanic rock called rhyolite. They are from Garnet Hill near Ely.