Quartzite is a tough stone composed mostly of quartz. It may be derived from sandstone or from chert by regional metamorphism. (more below). Quartzite forms in two different ways. In the first way, under the pressures and temperatures of deep burial, sandstone or chert recrystallizes resulting in a metamorphic rock.A quartzite in which all traces of the original grains and sedimentary structures are erased may also be called metaquartzite.This Las Vegas boulder is a metaquartzite.more below). Quartzite forms in two different ways. In the first way, under the pressures and temperatures of deep burial, sandstone or chert recrystallizes resulting in a metamorphic rock. A quartzite in which all traces of the original grains and sedimentary structures are erased may also be called metaquartzite.
Chapped lips (also cheilitis simplex or common cheilitis) are characterized by cracking, fissuring, and peeling of the skin of the lips, and are one of the most common types of cheilitis. While both lips may be affected, the lower lip is the most common site.
Clefting results when there is not enough tissue in the mouth or lip area, and the tissue that is available does not join together properly. A cleft lip is a physical split or separation of the two sides of the upper lip and appears as a narrow opening or gap in the skin of the upper lip.