Pyroclastic texture: Rocks formed from the deposition of volcanic ash and other tephra. These form when magma erupts as an aerosol of fine particles. Often, ash particles are still slightly sticky when they fall, sticking together to form welded tuff. Lapilli and other fragments are often cemented in. Image: Building stone for the Chapel of St Antony, built in 1715 in Funchal, Madeira. (© Ian G. Stimpson, via blog hypocentre.wordpress.com)
This is an image for Basaltic…? Felsic…? Porphyritic…? Confusion!.