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.

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

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.

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BA(OH)2 (Barium hydroxide)

Barium hydroxide is a chemical compound with the chemical formula Ba(OH)₂ₓ. The monohydrate, known as baryta or baryta-water, is one of the principal compounds of barium.