Phyllite Facts

Phyllite Facts
Phyllite is a fine grained metamorphic rock that resembles its sedimentary parent rock, shale. Shale can metamorphose into slate, schist, gneiss or phyllite depending on the degree of heat and pressure. Phyllite is typically grey in color and has a sheen from tiny grains of mica. It has a corrugated cleavage and easily splits into sheets due to the parallel alignment of platy minerals.
Interesting Phyllite Facts:
Phyllite is associated with regional metamorphism due to mountain building. It is commonly found in the Dalradian Metasediments of northwest Arran.
It is primarily composed of quartz, sericite, mica, and chlorite.
Continued metamorphism converts clay minerals into large grains of mica, along with quartz and feldspar. At that point, phyllite becomes schist.
The word phyllite comes from the Greek word phyllon meaning "leaf".
The parent rocks for phyllite is shale or pelite, or slate and are not usually visible with the naked eye.
Phyllite is often found as black to gray, or light greenish gray in color. It has a crinkled or wavy appearance as its foliation.
Phyllite is a durable and soft rock.
Phyllite may be used as decorative aggregates, floor tiles, and other interior home decorations or used as exterior building or facing stone, and garden decorations.
Other uses may include cemetery markers, commemorative tablets, creative artwork, and writing slates.
It is scaled between 1-2 on the Mohs Hardness scale and has a specific gravity or 2.72 - 2.73.
Phyllite has a resistance to heat, pressure, and water.


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