Editing Metamorphic rock (section)

===Textural changes===
The change in the particle size of the rock during the process of metamorphism is called [[Recrystallization (geology)|recrystallization]]. For instance, the small [[calcite]] crystals in the sedimentary rock [[limestone]] and [[chalk]] change into larger crystals in the metamorphic rock [[marble]].{{sfn|Yardley|1989|p=127, 154}} In metamorphosed sandstone, recrystallization of the original quartz sand grains results in very compact quartzite, also known as metaquartzite, in which the often larger quartz crystals are interlocked.<ref>{{cite book |editor1-last=Jackson |editor1-first=Julia A. |title=Glossary of geology. |date=1997 |publisher=American Geological Institute |location=Alexandria, Virginia |isbn=0922152349 |edition=Fourth |chapter=Metaquartzite}}</ref> Both high temperatures and pressures contribute to recrystallization. High temperatures allow the [[atom]]s and [[ion]]s in solid crystals to migrate, thus reorganizing the crystals, while high pressures cause solution of the crystals within the rock at their point of contact.{{sfn|Yardley|1989|p=154-158}}