Foliation

Granulite

(Classification- Other Rock Names)

course grained metamorphic rock of any composition, not banded

Eclogite

(Classification - Other Rock Names)

Garnet + Pyroxene (Olivine changes to Garnet)

Amphibolite

(Classification- Other Rock Names)

Course-grained Amphibole rich rock

(Marble Falls, Enchanted Rock, Burnet Area)

Hornfels

non-foliated clays, miscellaneous, fine-grained (looks like a brick)

- SHale and claystone that has been baked

All amphiboles

Index Minerals

Metamorphic Grade

-- in shales with Fe and Mg Component

Chlorite                Low Grade        Phyllite and

Biotite                        l                     Schist

Garnet                       l                         l

Staurolite                   l                         l

Kyanite                      l                        v Granulites+

Sillimanite                  v                           Gneiss

                          High Grade

The metamorphic rock formed from limestone is...

A.  Quartzite

B.  Hornfels

C.  Slate

D.  Marble

Heat from an igneous intrusion is the primary agent of change in ____ Metamorphism

A.  Contact

B.  Regional

C.  Dynamic

D.  Pseudomorphism

Mylonites are formed by _____ Metamorphism

A.  Contact

B.  Regional

C.  Cataclastic

D.  Pseudomorphism

Which of the following metamorphic rocks display a foliated texture?

A.  Marble

B.  Quartzite

C.  Hornfels

D.  Slate

Which metamorphic rock contains the same basic minerals as an igneous rock?

A.  Gneiss

B.  Schist

C.  Quartzite

D.  Marble

Which mineral would indicate the higher grade of metamorphism?

A.  Biotite

B.  Chlorite

C.  Garnet

D.  Muscovite

Quartzite

A hard, generally light colored metamorphic rock with an arenaceous composition. Most are glassy and have sharp edges.

-Composed mostly of recrystallized quartz

Marble

A medium or coarse grained, generally light colored rock with a mafic composition

-Recrystallized calcite