phyllite
Sign in to savePhyllite|thumb thumb|Photomicrograph of [[thin section of phyllite (in cross polarised light)]] thumb|Fractured Duke_University#Duke_stone | Duke stone showing phyllitic texture thumb|Phyllite
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Phyllite|thumb thumb|Photomicrograph of [[thin section of phyllite (in cross polarised light)]] thumb|Fractured Duke_University#Duke_stone | Duke stone showing phyllitic texture thumb|Phyllite
Phyllite ( ) is a type of foliated metamorphic rock formed from slate that is further metamorphosed so that very fine grained white mica achieves a preferred orientation. It is primarily composed of quartz, sericite mica, and chlorite.