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Hydroxyapatite by Yoshiki Oshida

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CHAPTER 2

STRUCTURE AND PROPERTIES

Yoshiki Oshida and Katsumasa Tsushima

2.1   INTRODUCTION

The name “apatite” comes from the Greek word απατω, which means to deceive. The reason for this was that the mineral appeared in different colors with a variety of crystals, and was thus often mistaken for precious minerals such as aquamarine or amethyst [1]. What is actually happening inside the apatite crystal structure is based on the unique characteristics of ion exchangeability in M-site, B-site, and A-site in M10B6A2, where M are bivalent cations, B are trivalent anions representative of XO4, and A are monovalent anions and can be substituted by fluoride, chloride, or carbide.

Figure 2.1 illustrates the unit cell of crystal structure of stoichiometric ...

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