Metamorphic Rocks

Question 1

Slate

Answer 1

Lowest grade, regional metamorphism of shale or ash, foliated, slaty cleavage.

Question 2

Phyllite

Answer 2

Low-intermediate grade, foliated, coarser grains, glossy/lustrous sheen

Question 3

Schist

Answer 3

Intermediate-high grade, foliated, clearly visible platy minerals (biotite), garnet and staurolite porphyroblasts.

Question 4

Gneiss

Answer 4

High grade, bands of light (quartz, feldspar) and dark (biotite) minerals

Question 5

Migmatite

Answer 5

Mixture of igneous and metamorphic components separated into light and dark patches.

Question 6

Cataclastite

Answer 6

Formed in brittle part of upper crust (subduction zones)

Question 7

Quartzite

Answer 7

Metamorphism of sandstone or chert. Non-foliated texture.

Question 8

Chlorite

Answer 8

Low grade, found in slate and phyllite

Question 9

Muscovite

Answer 9

Intermediate grade, found in slate, phyllite, schist.

Question 10

Biotite and Andalusite

Answer 10

Intermediate grade, found in phyllite, schist, gneiss

Question 11

Garnet

Answer 11

Intermediate-high grade, found in phyllite, schist, gneiss

Question 12

Sillimanite

Answer 12

High grade, found in gneiss.