Name
Section
Lab 8:
Metamorphic Rock Identification
FOLIATION: Number these different foliation types in order of metamorphic grade
from lowest (1) to highest (5)
Gneissic
Migmatitic
Phyllitic
Schistose
Slatey
INDEX MINERALS IN FOLIATED METAMORPHIC ROCKS:
most foliated rocks are rich in silicate
minerals. Some minerals form only in limited pressure and temperature conditions, and so are
indicative of a particular metamorphic grade. Use the available Index Mineral chart in your lab
reading and list which of these silicate minerals are most likely to be found in these foliated
metamorphic types. Some minerals may occur in multiple grades of metamorphic rock:
Amphibole
Biotite
Chlorite
Garnet
Kyanite
Muscovite
Pyroxene
Sillimanite
Staurolite
SLATE
PHYLLITE
SCHIST
GNEISS
NON-FOLIATED METAMORPHIC COMPOSITIONS:
match which minerals are found in which
non-foliated metamorphic rocks. Consult the non-foliated metamorphic rock identification
chart in your lab reading for assistance.
b. Garnet
c. Dolomite
d.
Calcite
a.
Quartz
Amphibolite
Quartzite
Marble
e. Amphibole
Metaconglomerate