The International Mineralogical Association and UNESCO celebrates 2022—the Year of Mineralogy. However, this year was not chosen randomly. Indeed, 2022 is the bicentennial of the death of René Just Haüy (born 1743), who is considered to be one of the founders of crystallography and mineralogy in their modern state. The year 1822 also marks the publication of Haüy’s Traité de minéralogy and Traité de cristallographie. Mineralogy is one of the oldest branches of science, with its origin in at least antic times, but its scientific renaissance started a little more than a century ago, when precise crystallographic studies, such as X-ray structural analysis (mainly, but not only), significantly improved the value of research results. Since the first decade of the XX century, mineralogy and crystallography together have played a key role in our everyday lives.
Various scientific events are being held around the world under the auspices of this landmark event, the Year of Mineralogy, and it is highly satisfying that this Special Issue “Mineralogical Crystallography Volume II” is published in 2022. The first volume of the “Mineralogical Crystallography” Special Issue [1] consisted of such topics as: Discovery of new mineral species; Crystal chemistry of minerals and their synthetic analogs; Behavior of minerals at non-ambient conditions; Biomineralogy; and Crystal growth techniques, and appeared to be very fruitful. The Special Issue “Mineralogical Crystallography Volume II” covers the following topics: Crystal chemistry and properties of minerals and their synthetic analogs; Gemology; Natural-based cement materials; Biomineralogy; and Crystal growth techniques. Additionally, we hope that this continuation will be just as successful, and that the new set of papers will again arouse genuine interest among readers and, perhaps, inspire them in their own successful research. We also believe that with the current collection of papers, we will be able to pay tribute to the union of Mineralogy and Crystallography.