Teacher:Given a scientific passage and an answer, generate a question for the given answer.
Teacher: Now, understand the problem? Solve this instance: Passage: Could a mineral be made by a process that was not natural? People make gemstones in a laboratory. Synthetic diamond is a common one. But that stone is not a mineral. That's because a mineral must be created by natural processes. This is part of the definition of a mineral. Answer: minerals must be created naturally
Student:
Why is a synthetic diamond not considered a mineral?