Discover More: Rocks and Minerals is much more than a simple spotters' guide.
reviewers, and reported by users of the earlier This third edition (or issue) of the Quantitative Data File for ore minerals (QDF) of the Commission on editions. The result is that 510 species and 125 are Mineralogy of the International Mineralogical compositional or structural variants, or varieties, of Association (COM-IMA) is published, with the species, are represented in QDF3. A large number of support of the Natural History Museum, London, by the entries include data collected from the type Chapman & Hall. It has been greatly revised and specimen of a mineral: these include data extracted enlarged and now includes graphs of the reflectance from the published literature. In this respect, QDF3 spectra for all of its entries. These have been differs from earlier editions. included in response to requests from users of the We have also revised and simplified the notes earlier editions. Also included, for those users concerning X-ray data: no longer are the strongest unfamiliar with the application of such spectra to lines in the powder diffraction pattern quoted, nor mineral identification, are introductory notes, are cell dimensions generally given. Instead, it was illustrated with examples of R spectra. decided to refer to data from the original description, The 635 data sets, which are arranged or to data in the PDF of the JCPDS.
In his foreword to Structural Mineralogy. An classification was taken into account. The first Introduction (Lima-de-Faria, 1994) P.B. Moore classification of this type, which takes into conÂ emphasized that this book "is really not an end in sideration the distribution of bonds in a structure, itself. Rather it is a rallying call to urge further was that of silicates proposed by Machatschki clarification, representation and systematization (1928) and developed by Bragg (1930) and NarayÂ of already known structures". If we consider the Szabo (1930). new book by Lima-de-Faria, Structural ClassiÂ The pure structural classification of minerals fication of Minerals, in this context, we can ask was first proposed by J. Lima-de-Faria in 1983. It corresponds to the application of the general what kind of new mineralogical data it contains. The twentieth century was characterized by structural classification of inorganic compounds great progress in the study of minerals. Less than (Lima-de-Faria & Figueiredo, 1976) to minerals, 100 minerals were known up until 1800. Since that which are an integral part of them. The most time, the rate of discovery of new minerals is general approach of the structural systematics is steadily increasing. Now it is found that natural based on the analysis of the strength distribution processes select some 4000 mineral species, and and of the directional character of the bonds in this number is increasing by 50-60 minerals every crystal structures.