Location: 50.431 ° N, 7.147° E
Elevation: 523 m
Lapilli is a size classification term for thephra, which is material that falls out of the air during aVolcanic eruption. Lapilli (singular: lapillus) means "little stones" in Latin. They are in some senses similar to ooids or pisoids diameter. A pyroclastic particle greater than 64 mm in diameter is correctly known as a volcanic bombs when molten, or a volcanic block when solid. Pyroclastic material with particles less than 2 mm in diameter is referred to volcanic ashes.
Photo: Rolf Cosar Engeln, 16.08.2008