Phyllite
Phyllite is a type of foliated metamorphic rock primarily composed of quartz, sericite mica, and chlorite; the rock represents a gradiation in the degree of metamorphism between slate and mica schist. Minute crystals of graphite, sericite, or chlorite impart a silky, sometimes golden sheen to the surfaces of cleavage (or schistosity). Phylite is formed from the continued metamorphism of slate. Phyllite is one step beyond slate in the chain of metamorphism. Whereas slate has a dull surface because its metamorphic minerals are extremely fine grained, phyllite has a definite sheen from tiny grains of mica, graphite, chlorite and similar minerals, because with further heat and pressure, the reflective grains grow more abundant and join each other. And whereas slate usually breaks in very flat sheets, phyllite tends to have a corrugated cleavage Phyllites are usually black or gray. The foliation is commonly crinkled or wavy in appearance.
Phyllite is from scientific Latin and means "leaf-stone."
T i t a n i o
BLACK PHYLLITE SLABS
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