1. a. chlorite + albite + epidote ± actinolite, quartz1. Name the common mineral assemblages of the following metamorphic facies: a. Greenschist b. Blueschist c. Eclogite d. Granulite 2. What is an QAPF diagram used for? What does it stand for? 3. What is the name of the platy variety of albite? 4. Explain the etymology of "feldspar". 5. What is the difference between the two groups of garnet? Which group does almandine belong in?
b. glaucophane + lawsonite + chlorite + sphene ± epidote ± phengite ± paragonite, omphacite
c. omphacite + garnet ± kyanite, quartz, hornblende, zoisite
d. orthopyroxene + clinopyroxene + hornblende + plagioclase ± biotite
2. Stands for Quartz,Alkali feldspar, Plagioclase, Feldspathoid. It's used to classify plutonic and sometimes volcanic rocks if mineralogical compositions were already determined.
4. The modern name probably derives from terms used by German miners. "Feld" is an old name for hard rocks and "spat" referred to any rock or mineral that if stroked by a hammer forms plain surfaces (as said feldspars indeed show perfect cleavage).
5. The first group has Aluminum as the second element(pyralspite) and the second group has Aluminum as the first element(Ugrandite). Almandine belongs to the pyralspite group.