Match each geological rock specimen with its corresponding genetic classification and diagnostic textural characteristic.
- ObsidianExtrusive igneous rock with an amorphous, glassy texture formed by rapid quenching of silica-rich lava
- GabbroIntrusive igneous rock with a coarse-grained phaneritic texture composed primarily of calcium-rich plagioclase and pyroxene
- QuartziteNon-foliated metamorphic rock formed by recrystallization where fractures propagate through rather than around quartz grains
- CoquinaBiochemical sedimentary rock formed from the poorly consolidated accumulation of coarse fossil shell fragments
Answer
Obsidian pairs with the extrusive amorphous glassy rock from rapid quenching; Gabbro pairs with the coarse-grained intrusive rock containing plagioclase and pyroxene; Quartzite pairs with the non-foliated metamorphic rock with interlocking grains that fracture through crystals; Coquina pairs with the biochemical sedimentary rock composed of fossil shell fragments.
Each rock specimen is accurately paired with its genetic environment (extrusive igneous, intrusive igneous, metamorphic, or biochemical sedimentary) and its diagnostic physical and textural signature.
Step-by-Step Solution
Key Concept
Classification of rocks into igneous, sedimentary, and metamorphic categories based on formation mechanism, mineral composition, and diagnostic texture.
Estimated Time:1m 30s