Metamorphic Rocks

Slate

Texture: Foliated / Very fine-grained Common Minerals: None visible Metamorphic Grade: low Description: Splits into flat slabs along well-developed cleavage planes. It has a dull sheen. Rings when hammered.

Phyllite

Texture: Foliated / Fine-grained Common Minerals: Micas dominate Metamorphic Grade: low to medium Description: Generally splits along wrinkled or wavy surfaces. It has a shiny, silky sheen.

Schist

Gneiss

Texture Foliated / Medium to coarse-
grained
Common Minerals: K-feldspar,
plagioclase feldspar, amphibole
Metamorphic Grade: High
Description: Minerals separated into
light and dark bands.

Quartzite

Texture: Non-Foliated / Medium to
coarse-grained
Common Minerals: Quartz
Description: Fused quartz grains, very
hard.

Marble

Texture: Non-Foliated / Medium to
coarse-grained
Common Minerals: Calcite
Description: Interlocking calcite, reacts
with HCl.