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Here we aim to provide a background on X-Ray Diffraction analysis of quartz-like crystal structures with varying amounts of Al and Li substitution, existing confusions on their nomenclature and its implications for novel lithium silicate glass-ceramics. We reviewed the literature dealing with modifications of the quartz crystal structure and their stuffed LiAlSi O derivates, LiAlSi O - SiO solid solutions, the terminology of such phases and criteria used to define the structure known as virgilite. Based on this information