what is metamorphic rock used for?
<br /><br /><b>Slate</b> is another metamorphic rock that is used in buildings for floor and roofing tiles, and it was once used for blackboards. <br /><br /><b>Quartzite</b> is used as a source of silica; other forms of metamorphic rocks are useful as building components, monuments, counter tops, and facings.