The distribution of minerals in hyper-agpaitic rocks in terms of symmetry: evolution of views on the number and symmetry of minerals

2001 ◽  
pp. 73-82 ◽  
Author(s):  
Alexander P. Khomyakov
Keyword(s):  
Crystal Structures ◽  
21St Century ◽  
Special Interest ◽  
Periodic Table ◽  
Mineral Species ◽  
Original Series ◽  
Temperature Range ◽  
The Earth ◽  
High Alkalinity ◽  
Low Symmetry

NOTE: This article was published in a former series of GEUS Bulletin. Please use the original series name when citing this article, for example: Khomyakov, A. P. (2001). The distribution of minerals in hyper-agpaitic rocks in terms of symmetry: evolution of views on the number and symmetry of minerals. Geology of Greenland Survey Bulletin, 190, 73-82. https://doi.org/10.34194/ggub.v190.5176 _______________ Among the unique mineral localities of the Earth the complexes of nepheline syenites with hyper-agpaitic differentiates are of special interest due to their extreme diversity of mineral species. The four best studied complexes of this type – Khibina, Lovozero, Ilímaussaq and Mont Saint-Hilaire – have yielded more than 700 mineral species of which about 200 are new. The great mineral diversity is due to the combination of several factors, the most important of which is the extremely high alkalinity of agpaitic magmas, causing about half of the elements of the periodic table to be concentrated together. Minerals from hyper-agpaitic rocks are characterised by the predominance of highly ordered, low-symmetry crystal structures resulting, in particular, from the markedly extended temperature range of crystallisation. Generalisation of available data for unique mineral localities underpins the hypothesis that there is no natural limit to the number of mineral species. It is predicted that by the middle of the 21st century, the overall number of minerals recorded in nature will exceed 10 000, with the proportion of triclinic species increasing from the present 9% to 14.5%, and that of cubic species decreasing from 10% to 5%.

scholarly journals Long-period changes of the air temperature in Tatarstan and their forecast till the end of the 21st century

2019 ◽  
pp. 94-107
Author(s):  
Yuri P. Perevedentsev ◽  
Konstantin M. Shantalinskii ◽  
Boris G. Sherstukov ◽  
Alexander A. Nikolaev
Keyword(s):  
Surface Temperature ◽  
Air Temperature ◽  
21St Century ◽  
Ocean Surface ◽  
The Arctic ◽  
Long Distance ◽  
Climate Fluctuations ◽  
Long Period ◽  
The Earth

Long-term changes in air temperature on the territory of the Republic of Tatarstan in the 20th–21st centuries are considered. The periods of unambiguous changes in the surface air temperature are determined. It is established that the average winter temperature from the 1970s to 2017, increased in the Kazan region by more than 3 °C and the average summer temperature increased by about 2 °C over the same period. The contribution of global scale processes to the variability of the temperature of the Kazan region is shown: it was 37 % in winter, 23 % in summer. The correlation analysis of the anomalies of average annual air temperature in Kazan and the series of air temperature anomalies in each node over the continents, as well as the ocean surface temperature in each coordinate node on Earth for 1880 –2017, was performed. Long-distance communications were detected in the temperature field between Kazan and remote regions of the Earth. It is noted that long-period climate fluctuations in Kazan occur synchronously with fluctuations in the high latitudes of Asia and North America, with fluctuations in ocean surface temperature in the Arctic ocean, with fluctuations in air temperature in the Far East, and with fluctuations in ocean surface temperature in the Southern hemisphere in the Indian and Pacific oceans, as well as air temperature in southern Australia. It is suggested that there is a global mechanism that regulates long-term climate fluctuations throughout the Earth in the considered interval of 200 years of observations. According to the CMIP5 project, climatic scenarios were built for Kazan until the end of the 21st century.

scholarly journals Serbian nation and its problems from the perspective of Polish nationalists in the early 21st century

2017 ◽  
Vol 7 (1) ◽  
pp. 205-232
Author(s):  
Jakub Sokół
Keyword(s):  
21St Century ◽  
Special Interest ◽  
Early 21St Century ◽  
The Future ◽  
Mutual Relations ◽  
The Early 21St Century

Abstract The article analyzes the situation of Serbs in Kosovo in terms of its reception by contemporary Polish nationalists in the magazine “Szczerbiec”. Serbian topics in Polish nationalist communities can count on special interest and recognition. The nationalist environments of many countries are showing solidarity with the Serbian nation in Kosovo and demanding recognition of their rights to these lands. The sympathy shown by Serbs to Poles, whose Slavic origins are linked, is pointed out. It can be assumed that the characteristics, attitude and views of the Serbs will foster mutual relations in the future.

The Earth Scientist’s Periodic Table of the Elements and Their Ions: A New Periodic Table Founded on Non-Traditional Concepts

2018 ◽  
Author(s):  
L. Bruce Railsback
Keyword(s):  
Periodic Table ◽  
General Concept ◽  
First Century ◽  
Arid Environments ◽  
Geological Society ◽  
The Earth ◽  
Science Stories ◽  
Science News ◽  
Almost All ◽  
Scientific Fields

The Earth Scientist’s Periodic Table of the Elements and Their Ions is a fundamentally new table that was first published in 2003 in the Geological Society of America’s (GSA) prominent journal Geology (Railsback 2003). The new table was reported in Nature, it was featured in a cover article by Science News, it was included among Discover magazine’s 100 Top Science Stories of 2003, and its publication was noted in many other magazines and online outlets. GSA sold a large number of reprints of the 2003 paper and then, in 2004, published a revised version of the table in GSA’s Map and Chart Series (Railsback 2004). When GSA’s printed stock ran low, the Society published a further revised version of the table in its Map and Chart Series in 2011 (Railsback 2011). The table has been translated into Chinese (Jin 2006), Spanish (Bernal and Railsback 2008), Portuguese (Franco de Souza Lima and Railsback 2012), and German. The original 2003 paper has been cited in journals ranging from Journal of Mathematical Chemistry to Carbohydrate Research to Geomicrobiology Journal to Journal of Arid Environments to Resource Geology to Reviews in Geophysics, and it has proven useful in understanding the topology of the periodic table (Restrepo et al. 2006). The success of the new Earth Scientist’s Periodic Table of the Elements and Their Ions across the past decade suggests that the periodic table, as a general concept, is not a static document but instead is still subject to evolution, especially as scientific fields beyond traditional chemistry increasingly use chemical perspectives. It further suggests that volumes like this one are not simply retrospective ruminations on a nineteenth-century invention, but instead they can be part of an ongoing process to find new meaning in the periodic concept and to make it more applicable in broader contexts in the twenty-first century. Despite the diversity of periodic tables produced over the last 140 years (e.g., Mazurs 1974), the Earth Scientist’s Periodic Table of the Elements and Their Ions differs both in conceptual origin and in form from almost all previous versions.

79Br, 127I NQR of Diammoniumalkyl Halides and Piperazinium Halides. Crystal Structure of Piperazinium Dibromide Monohydrate and Piperazinium Monoiodide

1989 ◽  
Vol 44 (1) ◽  
pp. 41-55 ◽  
Author(s):  
Jutta Hartmann ◽  
Shi-Qi Dou ◽  
Alarich Weiss
Keyword(s):  
Crystal Structure ◽  
Phase Transitions ◽  
Hydrogen Bonds ◽  
Crystal Structures ◽  
Monoclinic Space Group ◽  
Orthorhombic Space Group ◽  
Space Group ◽  
Temperature Range

Abstract The 79Br and 127I NQR spectra were investigated for 1,2-diammoniumethane dibromide, -diiodide, 1,3-diammoniumpropane dibromide, -diiodide, piperazinium dibromide monohydrate, and piperazinium monoiodide in the temperature range 77 ≦ T/K ≦ 420. Phase transitions could be observed for the three iodides. The temperatures for the phase transitions are: 400 K and 404 K for 1,2-diammoniumethane diiodide, 366 K for 1,3-diammoniumpropane diiodide, and 196 K for piperazinium monoiodide.The crystal structures were determined for the piperazinium compounds. Piperazinium dibromide monohydrate crystallizes monoclinic, space group C2/c, with a= 1148.7 pm, 0 = 590.5 pm, c= 1501.6pm, β = 118.18°, and Z = 4. For piperazinium monoiodide the orthorhombic space group Pmn 21 was found with a = 958.1 pm, b = 776.9 pm, c = 989.3 pm, Z = 4. Hydrogen bonds N - H ... X with X = Br, I were compared with literature data.

Crystal Chemistry of Stable and Metastable (Rapidly Quenched) B-Metal Alloy Phases

1968 ◽  
Vol 12 ◽  
pp. 23-49 ◽  
Author(s):  
Bill C. Giessen
Keyword(s):  
High Pressure ◽  
Crystal Structures ◽  
Solid Solutions ◽  
Periodic Table ◽  
Rapid Quenching ◽  
Pseudopotential Theory ◽  
Phase Fields ◽  
Disordered Crystal ◽  
Equilibrium Phases ◽  
Qualitative Discussion

AbstractThe crystal structures of elements and alloy phases in the B-metal region (B2(Zn) to B5(As) groups) have been classified into phase fields determined by their position in the periodic table. The limited number of equilibrium phases with element-like, disordered crystal structures and of extended terminal solid solutions has been more than doubled by the addition of metastable phases produced by ultra-rapid quenching from the melt (splat cooling). Strong structural correlations exist. Some high pressure phases have been included; in some cases, a qualitative discussion from the viewpoint of pseudopotential theory is given.

scholarly journals Stoic Theology: Revealing or Redundant?

Religions ◽  
2019 ◽  
Vol 10 (3) ◽  
pp. 193 ◽  
Author(s):  
Kai Whiting ◽  
Leonidas Konstantakos
Keyword(s):  
21St Century ◽  
Ethical Framework ◽  
Scientific Thinking ◽  
Environmental Challenges ◽  
The Earth

With the notion of advancing a modern Stoic environmental ethical framework, we explore the philosophy’s call to “living according to Nature”, as derived from ancient Stoic theology. We do this by evaluating the orthodox (ancient) viewpoint and the contemporary criticisms levelled against it. We reflect on the atheistic interpretations of Stoicism and their associated call to “live according to the facts”. We consider the limitations that this call has when applied to societal, and particularly non-human matters. We do not undertake this research with the aim of determining which view of Stoic theology is right or wrong. However, we contest one of the assumptions of the heterodox approach, namely that the Stoic worldview is incompatible with modern scientific thinking. Indeed, we demonstrate how Stoic theology, far from being outdated or irrelevant, is actually refreshingly contemporary in that it provides the tools, scope and urgency with which to deliver a far more considerate ethical framework for the 21st century. Finally, we suggest where Stoic theology can help practitioners to reframe and respond to environmental challenges, which we argue forms part of their cosmopolitan obligation to take care of themselves, others and the Earth as a whole.

scholarly journals I.—Chapters on the Mineralogy of Scotland. Chapter Fifth.—The Micas; with description of Haughtonite, a new Mineral Species

1880 ◽  
Vol 29 (1) ◽  
pp. 1-46 ◽  
Author(s):  
Heddle
Keyword(s):  
Optical Properties ◽  
Special Interest ◽  
Mineral Species ◽  
New Mineral ◽  
New Mineral Species ◽  
Great Vein ◽  
Characteristic Colour

Muscovite is so easily recognised by its optical properties that the only cases which seemed to me to call for analysis were those which, from being possessed of characteristic colour, were of special interest. Of these the most singular is a variety found rarely in the great vein of Ben Capval, Harris; it occurs in crystals of a peculiar green tint, the crystals are small and have somewhat of a pearly lustre.

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