Metamorphic Rocks
From sedimentary rocks
Quartzite (from sandstone)	Appearance: Sugary, smashed crysals make it sparkle
Marble (From limestone)	Appearance: milky, often with streaks. The great statues are carved from this
Slate (From shale)	Appearance: Flat, dark and brittle - old chalkboards are made from slate.
From igneous rocks
Gneiss (From granite or possibly schist)	Appearance: stripey, often warped. Zebra-rock
From metamorphic rocks
Schist (From slate)	Appearance: schist is shiny, often brittle. The waxy, glossy appearance gives it away