Discussion
Marble is the metamorphic equivalent of
Answer: D
Correct answer: limestone
Marble is recrystallised limestone: the heat and pressure convert the fine calcite of the original into an interlocking mosaic of coarser calcite crystals. It effervesces in dilute acid exactly as its parent does, since the chemistry is unchanged. The corresponding pairs are quartzite from sandstone, slate from shale, and gneiss from granite or from high-grade schist.
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