Добрый день, Коллеги. Важное сообщение, просьба принять участие. Музей Ферсмана ищет помощь для реставрационных работ в помещении. Подробности по ссылке
The purpose of the present text is to provide a concise survey of the history of mineralogy and crystallography through the year 1919. Hopefully, it reflects this rich area of study showing the development of these important scientific endeavors from simple origins through a maturity, which today some might regard as no more than technical art. This is mirrored in the fact that few people now would claim mineralogy as a science balanced on the edge of significant discovery, but that was not the case in the past. Then, mineralogy and its companion study crystallography, were important investigations with each new discovery being widely publicized and debated. Many researchers, some of whom may be counted among the greatest geniuses of the human race, explored, contemplated, and wrote about minerals and crystals. This history tries in some measure to spotlight these people and their discoveries. It is also written as a companion work to Mineralogy and Crystallography: A Biobibliography, which fully describes many of the books relevant to these studies across the same time period <...>
1. Об одном преобразовании элиптических интегралов
2. О реципрочных кривых и поверхностях
3. Сферические схемы
4. Баритокальцит и псевдоморфоза по нему барита
5. Естественные фигуры вытравления на топазе
6. Кристаллы минералогического музея
7. О сплавах платины с оловом
8. Кристаллы K2Cr2O7, их структура и двойники
Краткие сообщения
1. Сомнительный двойник авгита из Монте Росси
2. Усовершенствование критерия правильной установки кристаллов
3. Друзоид с р.Слюдянки
4. Случай вторичного наростания первичных полевыхъ шпатов порфира. Одна новая комбинация двойниковых законов четверника. Двойники по первой оси и перпендикуляру к ней
Crystals are solid materials having regular atomic arrangements characterized by periodicity and anisotropy. These properties are universally present, irrespective of whether the crystal is inorganic or organic, in living systems or in the inanimate world. Crystals exhibit various external forms, as represented by the elaborately varied dendritic forms of snow crystals or the hexagonal prismatic forms of rock-crystal. This variety of shape has stimulated scientific curiosity since the seventeenth century, since when intensive efforts have been made to understand the reasons why and how crystals can take a variety of forms <...>