Concept:Minerals are naturally occurring substances with a definite chemical composition and are formed in different geological environments. They can be metallic or non-metallic.
Explanation:Step 1: Options A, B, and C are true for minerals. They occur naturally, have a fixed chemical composition, and form under various geological conditions.
Step 2: Option D says "All minerals are non-metallic." This is false because many minerals, such as iron, copper, and gold, are metallic.
Step 3: Minerals are classified into metallic and non-metallic types. Hence, D is the incorrect statement.
Answer:D. All minerals are non-metallic.