Download Laboratory 7: Metamorphic Rock Identification - H

Laboratory 7: Metamorphic Rock Identification
1. Separate rocks into groups of foliated and non-foliated
2. Use the chart on page 143 to identify the rocks.
3. One rock not mentioned in your lab book is Greenschist - also known as
greenstone - is a general field petrologic term applied to metamorphic and/or
altered mafic volcanic rock. The green is due to abundant green chlorite, actinolite
and epidote minerals that dominate the rock. To qualify for the name a rock must
also exhibit schistocity or some foliation or layering. The rock is derived from
basalt, gabbro or similar rocks containing sodium-rich plagioclase feldspar,
chlorite, epidote and quartz. Chlorite and epidote give the green color
4. For each identified mineral, prepare an index card with the following information
a. name of rock
b. texture
c. mineral composition
d. possible parent rock(s)
e. any other important identifying characteristics
f. tectonic origin of rock