Blue Biggs Jasper stone, is a silicated volcanic ash. It was formed during a volcanic eruption and is part of a Miocene series of rocks called the John Day Formation, near Biggs, Oregon. It is a decorative stone used for jewelery and trinkets.
Vesuvius from Pompeii, Italy : Pompeii was an ancient Roman town in Italy. The city Pompeii was mostly destroyed and buried under 4 to 6 m to 20 ft) of volcanic ash and pumice in the eruption of Mount Vesuvius in 79 AD.