Blue Biggs Jasper stone. Blue Biggs Jasper 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, USA. It is a decorative stone used for jewellery and trinkets.
St Micheals mount, Penzance. Cross the crossway at low tide and explore the castle and its beautiful gardens. Legend says a giant threw the rocks into the sea in anger. Just make sure you time it right on the way back. The tide races in fast and can cut of the unwary walker, so take one of the many boats back
I love the natural feeling Andy has gave this picture. He has broken rocks almost perfectly through the middle to create a path. The white layer near the crack also make the picture even more appealing.