Choose from these words to fill the blanks below:

hydrogen, crystal, single, opal, rock, solid, halite, food, citric, sheets, naturally, glass

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mineral

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                  naturally occurring

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something like           glass or concrete would not be a mineral

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solid crystalline substance

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something like         opal is not a mineral, which is simply an amorphous form of silica or non-crystalline solid, lacks the long-range order characteristic of a               crystal

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usually inorganic

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we can have some organic minerals e.g. a compound containing organic         food-based acids, such as amino acids and             citric acid

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has a specific chemical composition

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must have a chemical formula that you can write down

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commonly known as         rock salt, or table salt

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the mineral form of sodium chloride (NaCl)

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Muscovite mica

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very thin             sheets

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a phyllosilicate (hydrated, with either water or hydroxyl groups attached) mineral of aluminum and potassium with formula KAl2(AlSi3O10)(F,OH)2, or (KF)2(Al2O3)3(SiO2)6(H2O)

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rock

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naturally occurring

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solid aggregate of minerals

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could be a             single mineral, e.g. a chunk of halite is also considered a rock

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is usually a mixture of minerals

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also can contain non-mineral           solid matter

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coal

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combustible black or brownish-black sedimentary rock

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composed primarily of carbon along with variable quantities of other elements, chiefly                 hydrogen, sulfur, oxygen, and nitrogen