"Slate, dense, fine-grained fissile rock, formed by the metamorphism of shale and clay, or more rarely of igneous rocks. The process of metamorphism results in consolidation of the original rock and in formation of new cleavage planes along which slate characteristically splits into thin, broad sheets. Many rocks that show "slaty cleavage" are by extension loosely called slate. True slate is hard and compact and does not undergo appreciable weathering. The basic minerals comprising slate are quartz and muscovite, a kind of mica...Slate is commonly bluish-black or gray-black in color, but red, green, purple, and variegated varieties are known."

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African color Autumn African Multi- Color Amber Gold Autumn Green Beige Rose Blue limestone

China Gold China Grey China Lotus China multi-color China sea green Copper Grey

Copra Green Copra Red Dark grey Desert Beige Cloud Green Desert Rose

Desert Sunset Desert Tan Emerald Green Everglade Fossil Stone Green Lime

Jade Green Kashmere Midnight Black Mottle Mountain Mist Purple

Rajah Red Rajah Rose Lime Rose Quarzt Rose Sand Safari