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The spectra of borate minerals show great variety and complexity, arising from the many possible anions which these materials may contain. It is therefore necessary to establish some principles for determining which anions may be present, and then to discuss the spectra characteristic of these ions. The structural principles involved have been discussed by Wells (1960), Christ (1960), Edwards and Ross (1960) and Valyashko and Vlasova (1969), and the following rules have been formulated: 1. The coordination polyhedron around a boron atom will be either a triangle or a tetrahedron. 2. Polynuclear anions can be formed from these coordination...

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