The true statement is:
Minerals can be elements or compounds.
To clarify the other statements:
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Minerals can be liquids. This is false; minerals are typically defined as solid substances with a crystalline structure. While some minerals may exist in molten forms (like magma), the definition of a mineral pertains to a solid state.
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Minerals must be organic. This is false; minerals are inorganic by definition. They do not originate from living organisms.
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Emeralds are more common than quartz. This is false; quartz is one of the most abundant minerals in the Earth's crust, while emeralds are much rarer.