Defect chemistry is definitely the study of issue defects in imperfect crystals. These include things like vacancies, interstitial atoms or ions, trace features, electrons, or holes or another deviation from the composition of a great crystal. Even absolutely pure crystals contain level defects at any temperature higher than absolute zero. https://www.tumblr.com/thegemjournal/759696203354128384/understanding-the-unique-characteristics-of-yellow?source=share