Question

Although coal is sometimes considered a mineral, which criteria of minerals does it violate? . . A. Minerals are solids. . . B. Minerals are natural. . . C. Minerals are inorganic. . . D. Minerals have a definite chemical composition.

Answer 1

the criteria of minerals that coal violates is : C. Minerals are inorganic

One of the characteristic of Coal is it contain Carbon. And the substance that contain Carbon is considered as organic substance.

hope this helps

Answer 2

Coal is not a mineral. It is a sedimentary rock or, in the case of butiminous coal, a metamorphic rock. The answerers above are correct. Organic is probably the answer that is sought. Coal is more like a random arrangement of microcrystals of large organic molecules. The fact that it has a variable composition and structure also causes it to violate the standard definition of mineral.minerals are inorganic