The statement that is true is: Both minerals leave the same color streak.
This indicates that while they may have different appearances (Mineral A being purple and Mineral B being black), they can exhibit the same streak color, which is a characteristic of the minerals related to their composition rather than solely their outward appearance.
The other statements cannot be definitively determined to be true based on the given information. Specifically:
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Mineral A is made from different elements than Mineral B. This may or may not be true, as different minerals can have the same streak color.
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Both minerals have identical physical properties. This is unlikely, especially since their colors are different, indicating differences in physical properties.
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Mineral B is a gem, but Mineral A is a common mineral. This cannot be concluded without specific information about the classification of the minerals.
Therefore, the most accurate statement based on the provided information is that they leave the same color streak.