Answer :

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A Minerals A Pure Substance And A Rock Is A Mixture Of Two Or More Minerals In Various Proportions.

For Instance Rock Granite Is Made Up Of Three Minerals: Quartz  Feldspar and Biotite. (mica)

A Mineral is an chemical compound with an constant chemical composition which of course is the definition of a "Pure Substance" 
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magfulltime

Answer:

  • Identify whether the mineral has a chemical composition.

Explanation:

In order to determine whether an unknown substance is a mineral tests to determine some properties need to be done.

Mineral's properties are key to establish its identity because the properties are determined by the chemical composition and crystal structure, or the way that the atoms are arranged.

Mineral properties include: color, streak. luster, density, hardness, cleavage and fracture, among others.

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