sand - coarse beach sand with a high percentage of glass grains - 250 ml display bottle with ground glass stopper these larger student specimens are

these larger student specimens are from a vein with some attached quartz or wall rock

sometimes with the central opening collapsed

and they range from faint to obvious

calcium carbonate

The third photo shows the shortwave phosphorescent glow

sand - coarse beach sand with a high percentage of glass grains - 250 ml display bottle with ground glass stopper these larger student specimens areFor years residents at Ft. Bragg, California threw their trash over the bluff into the Pacific. Cars, old shoes, everything. Some time ago the trash was almost all cleaned up, but the glass remained to become part of the sand. Glass Beach is a part of a state park, where collecting is not permitted. However, the longshore current moves sand southward along the coast in California, and small coves south of the park have a high percentage of glass