Use the information about two substances to answer the question.

To determine the correct statements regarding Substance A and Substance B, we need to consider their definitions:

- A **mineral** is typically defined as a naturally occurring, inorganic solid with a definite chemical structure.

Now, let's analyze each substance:

- **Substance is described as organic, naturally occurring, and a solid. Since it is organic, it does not fit the common definition of a mineral (which is generally inorganic).

- **Substance B** is described as having a definite chemical structure and being naturally occurring. While the information does not explicitly state whether it is organic or inorganic, the emphasis on a definite chemical structure suggests the possibility of it being a mineral, especially since it is naturally occurring. However, it could also be an organic compound that fits within certain classifications of minerals.

Based on this analysis, the correct choice is:

**Substance A is not a mineral. Substance B could be a mineral.**