Slate vs Gneiss - Compare Nature
Slate is available in black, brown, buff, green, light to dark grey, purple, red, shades of blue colors whereas, Gneiss is available in black, brown, pink, red, white colors. Appearance of Slate is Dull and that of Gneiss is Foliated. Properties of rock is another aspect for Slate vs Gneiss. The hardness of Slate is 3-4 and that of Gneiss is 7.