17. Micah classified six minerals into two groups based on a single property as shown below. Which property was used to classify the minerals? Group I Group 2 Рyrite Calcite Galena Dolomite Bornite Malachite A. Cleavage B. Habit C. Specific gravity D. Chemical composition 18. Why can't petroleum be considered as a mineral? A. It is made of organic material. B. It does not have a crystalline structure. C. It does not have a definite chemical composition. D. It is solid.

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