Discussion
Calcite is distinguished from quartz in hand specimen by its
Answer: C
Correct answer: rhombohedral cleavage and effervescence in acid
Two tests settle it at once. Calcite cleaves into rhombohedra, a shape quartz never shows, and it effervesces in dilute acid, which quartz does not. Hardness confirms it: calcite at 3 is scratched by a knife, and quartz at 7 scratches glass.
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