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Reference.org
Law of rational indices
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<p>The law of rational indices is an <a href="/facts/Empirical_research/A6cy8Rcy">empirical</a> law in the field of <a href="/facts/Crystallography/9B5toeqG">crystallography</a> concerning <a href="/facts/Crystal_structure/bJ4bCeHd">crystal structure</a>. The law states that "when referred to three intersecting axes all faces occurring on a crystal can be described by numerical indices which are integers, and that these integers are usually small numbers." The law is also named the <i>law of rational intercepts</i> or the <i>second law of crystallography</i>. </p>