Discussion
Gypsum is distinguished from calcite by being
Answer: C
Correct answer: softer, and not effervescent in acid
Gypsum at 2 can be scratched by a fingernail, while calcite at 3 cannot; and gypsum is a sulphate, so it does not effervesce in acid as calcite does. Either test alone distinguishes them, and both are quick to make in the field.
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