In addition to the effervescent acid reaction
In addition to the effervescent acid reaction, which is valuable in identifying calcite, there are other properties of certain minerals that are easily tested. Magnetite is a magnetic mineral, halite is salty, and sulfur has a distinctive odor. Identifying minerals in a rock is not always possible with hand samples, as the crystals may not be visible to the naked eye. In these situations, whenever mineral study requires it, it is necessary to allow light to pass through and conduct observations under a microscope.
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