A. Igneous rocks have textures that are either comprised of interlocking crystals, or textures that resulted from the cooling of hot liquid material. Sedimentary rocks have textures that result from the transport and assembly of materials or from the precipitation of minerals. The textures of metamorphic rocks consist of mineral crystals that may or may not be aligned parallel to each other. 1. well-sorted/poorly-sorted.
2. grain sizes.
3. non-foliated.
4. wel-rounded/very angular.
5. aphanitic.
6. porphyritic.
7. pegmatitic.
8. phaneritic.
9. vesicular.
10. foliated.
B. lgneous, sedimentary, and metamorphic rocks all form in environments different from each other. As a result, each rock class is related only to one or more very specific origin.
1. detrital.
2. intruaive.
3. chemical.
4. biochemical.
5. parent rock.
6. extrusive.
C. Each rock type can only ever belong to a single rock class. To determine the class for each rock, consider how it forms within the environment.
1. shale.
2. quartzite.
3. basalt.
4. gneiss.
5. peridotite.
6. coquina.
7. breccia.
8. andesite.
9. quartzose sandstone.
10. granite.
11. slate.
12. metaconglomerate.