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Iron species are the most common impurities in glasses, therefore their effect on structure and properties of various glasses has long been of great scientific interest. Iron in glass is usually present in its Fe 3+ and/or Fe 2+ states as a result of the equilibrium established in the melt during synthesis. 1 Both of these types of iron ions can occupy sites with different oxygen coordination, which leads to different structural roles of iron ions in the glass network (network former and modifier), hence should affect the structure, crystallization and phase separation processes, which by-turn should influence the physical and chemical properties of the resulting glasses. The effect iron has on properties and structure also depends upon the base glass composition. The more complex the system is, the more ambiguous the iron's influence is. For example, borosilicate (BS) glasses have two glass-formers, hence combine their unique properties. One of the most studied BS systems is the sodium borosilicate (NBS) system. NBS glasses are approved in USA, France, UK, and other

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