Problem: Examine the sample below and answer each question. Partial credit will be given.
1. Name the sample in the photograph.
2. Provide its classification (mineral, extrusive igneous rock, intrusive igneous rock, detrital sedimentary rock, chemical/biochemical/organic sedimentary rock, foliated metamorphic rock, or non-foliated metamorphic rock).
3. Using appropriate terms (example: metallic luster, porphyritic, etc.), explain in detail how you derived your answer.