To determine which statement is correct, let's analyze the characteristics of the two substances:
Substance A: It is described as organic, naturally occurring, and solid. Since minerals are defined as naturally occurring inorganic solids with a definite chemical structure, Substance A does not meet the criteria to be classified as a mineral because it is organic.
Substance B: It has a definite chemical structure and is also described as naturally occurring. This aligns with the definition of a mineral, which must be naturally occurring and have a definite chemical composition.
Based on this analysis, the correct statement is:
Substance A is not a mineral. Substance B is a mineral.