What is the most direct way to determine if a mineral is probably calcite?
Drop dilute hydrochloric acid on the mineral. If it effervesces, it is probably calcite.
Hold a magnet to the mineral. If you feel a pull, the mineral is calcite.
If the mineral has a conchoidal fracture, then it is calcite.
Drop dilute hydrochloric acid on the mineral. If it does not effervesce, it is probably calcite.
If the mineral has cleavage in three directions, then it is calcite.
Drop dilute hydrochloric acid on the mineral. If it effervesces, it is probably calcite.
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