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Gustav Von Leonhard
Gustav von Leonhard (12 November 1816 in Munich – 27 December 1878 in Heidelberg) was a German mineralogist and geologist. He was the son of mineralogist Karl Cäsar von Leonhard. He studied mineralogy and related sciences at the University of Heidelberg, receiving his doctorate in 1840. He continued his education in Berlin, and in 1841 obtained his habilitation at Heidelberg. In 1853 he became an associate professor of mineralogy at the University of Heidelberg. From 1862 until his death, he worked as editor, with Hanns Bruno Geinitz, of the "''Neues Jahrbuch für Mineralogie, Geologie und Paläontologie''", a journal which had been founded by von Leonhard's father. Published works * ''Über einige pseudomorphosirte zeolithische Substanzen aus Rheinbaiern, nebst allgemeinen Bemerkungen diese Gruppe mineralischer Körper betreffend'', 1841 – On some pseudomorphic zeolite substances from Rhenish Bavaria. * ''Handwörterbuch der topographischen mineralogie'', 1843 & ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gustav Von Leonhard (HeidICON 28868) (cropped)
Gustav von Leonhard (12 November 1816 in Munich – 27 December 1878 in Heidelberg) was a German mineralogist and geologist. He was the son of mineralogist Karl Cäsar von Leonhard. He studied mineralogy and related sciences at the University of Heidelberg, receiving his doctorate in 1840. He continued his education in Berlin, and in 1841 obtained his habilitation at Heidelberg. In 1853 he became an associate professor of mineralogy at the University of Heidelberg. From 1862 until his death, he worked as editor, with Hanns Bruno Geinitz, of the "''Neues Jahrbuch für Mineralogie, Geologie und Paläontologie''", a journal which had been founded by von Leonhard's father. Published works * ''Über einige pseudomorphosirte zeolithische Substanzen aus Rheinbaiern, nebst allgemeinen Bemerkungen diese Gruppe mineralischer Körper betreffend'', 1841 – On some pseudomorphic zeolite substances from Rhenish Bavaria. * ''Handwörterbuch der topographischen mineralogie'', 1843 & ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Zeolite
Zeolites are microporous, crystalline aluminosilicate materials commonly used as commercial adsorbents and catalysts. They mainly consist of silicon, aluminium, oxygen, and have the general formula ･y where is either a metal ion or H+. These positive ions can be exchanged for others in a contacting electrolyte solution. exchanged zeolites are particularly useful as solid acid catalysts. The term ''zeolite'' was originally coined in 1756 by Swedish mineralogist Axel Fredrik Cronstedt, who observed that rapidly heating a material, believed to have been stilbite, produced large amounts of steam from water that had been adsorbed by the material. Based on this, he called the material ''zeolite'', from the Greek , meaning "to boil" and , meaning "stone". Zeolites occur naturally but are also produced industrially on a large scale. , 253 unique zeolite frameworks have been identified, and over 40 naturally occurring zeolite frameworks are known. Every new zeolite structure that is ob ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Academic Staff Of Heidelberg University
An academy (Attic Greek: Ἀκαδήμεια; Koine Greek Ἀκαδημία) is an institution of secondary or tertiary higher learning (and generally also research or honorary membership). The name traces back to Plato's school of philosophy, founded approximately 385 BC at Akademia, a sanctuary of Athena, the goddess of wisdom and skill, north of Athens, Greece. Etymology The word comes from the ''Academy'' in ancient Greece, which derives from the Athenian hero, ''Akademos''. Outside the city walls of Athens, the gymnasium was made famous by Plato as a center of learning. The sacred space, dedicated to the goddess of wisdom, Athena, had formerly been an olive grove, hence the expression "the groves of Academe". In these gardens, the philosopher Plato conversed with followers. Plato developed his sessions into a method of teaching philosophy and in 387 BC, established what is known today as the Old Academy. By extension, ''academia'' has come to mean the accumulation, de ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Heidelberg University Alumni
Heidelberg (; Palatine German language, Palatine German: ''Heidlberg'') is a city in the States of Germany, German state of Baden-Württemberg, situated on the river Neckar in south-west Germany. As of the 2016 census, its population was 159,914, of which roughly a quarter consisted of students. Located about south of Frankfurt, Heidelberg is the List of cities in Baden-Württemberg by population, fifth-largest city in Baden-Württemberg. Heidelberg is part of the densely populated Rhine-Neckar, Rhine-Neckar Metropolitan Region. Heidelberg University, founded in 1386, is Germany's oldest and one of Europe's most reputable universities. Heidelberg is a Science, scientific hub in Germany and home to several internationally renowned #Research, research facilities adjacent to its university, including the European Molecular Biology Laboratory and four Max Planck Society, Max Planck Institutes. The city has also been a hub for the arts, especially literature, throughout the centurie ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Scientists From Munich
A scientist is a person who conducts scientific research to advance knowledge in an area of the natural sciences. In classical antiquity, there was no real ancient analog of a modern scientist. Instead, philosophers engaged in the philosophical study of nature called natural philosophy, a precursor of natural science. Though Thales (circa 624-545 BC) was arguably the first scientist for describing how cosmic events may be seen as natural, not necessarily caused by gods,Frank N. Magill''The Ancient World: Dictionary of World Biography'', Volume 1 Routledge, 2003 it was not until the 19th century that the term ''scientist'' came into regular use after it was coined by the theologian, philosopher, and historian of science William Whewell in 1833. In modern times, many scientists have advanced degrees in an area of science and pursue careers in various sectors of the economy such as academia, industry, government, and nonprofit environments.'''' History The ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1878 Deaths
Events January–March * January 5 – Russo-Turkish War – Battle of Shipka Pass IV: Russian and Bulgarian forces defeat the Ottoman Empire. * January 9 – Umberto I becomes King of Italy. * January 17 – Battle of Philippopolis: Russian troops defeat the Turks. * January 23 – Benjamin Disraeli orders the British fleet to the Dardanelles. * January 24 – Russian revolutionary Vera Zasulich shoots at Fyodor Trepov, Governor of Saint Petersburg. * January 28 – ''The Yale News'' becomes the first daily college newspaper in the United States. * January 31 – Turkey agrees to an armistice at Adrianople. * February 2 – Greece declares war on the Ottoman Empire. * February 7 – Pope Pius IX dies, after a 31½ year reign (the longest definitely confirmed). * February 8 – The British fleet enters Turkish waters, and anchors off Istanbul; Russia threatens to occupy Istanbul, but does not carry out the threat. * Feb ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1816 Births
This year was known as the ''Year Without a Summer'', because of low temperatures in the Northern Hemisphere, possibly the result of the Mount Tambora volcanic eruption in Indonesia in 1815, causing severe global cooling, catastrophic in some locations. Events January–March * December 25 1815–January 6 – Tsar Alexander I of Russia signs an order, expelling the Jesuits from St. Petersburg and Moscow. * January 9 – Sir Humphry Davy's Davy lamp is first tested underground as a coal mining safety lamp, at Hebburn Colliery in northeast England. * January 17 – Fire nearly destroys the city of St. John's, Newfoundland. * February 10 – Friedrich Karl Ludwig, Duke of Schleswig-Holstein-Sonderburg-Beck, dies and is succeeded by Friedrich Wilhelm, his son and founder of the House of Glücksburg. * February 20 – Gioachino Rossini's opera buffa ''The Barber of Seville'' premières at the Teatro Argentina in Rome. * March 1 – The Gork ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geognosy
Abraham Gottlob Werner (; 25 September 174930 June 1817) was a German geologist who set out an early theory about the stratification of the Earth's crust and propounded a history of the Earth that came to be known as Neptunism. While most tenets of Neptunism were eventually set aside, Werner is remembered for his demonstration of chronological succession in rocks; for the zeal with which he infused his pupils; and for the impulse he thereby gave to the study of geology. He has been called the "father of German geology". Life Werner was born in Wehrau (now Osiecznica, Lower Silesian Voivodeship), a village in Prussian Silesia. His family had been involved in the mining industry for many years. His father, Abraham David Werner, was a foreman at a foundry in Wehrau. Werner was educated at Freiberg and Leipzig, where he studied law and mining, and was then appointed as Inspector and Teacher of Mining and Mineralogy at the small, but influential, Freiberg Mining Academy in 17 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Quartz-porphyry
Quartz-porphyry, in layman's terms, is a type of volcanic (igneous) rock containing large porphyritic crystals of quartz. These rocks are classified as ''hemi-crystalline acid rocks''. Structure The quartz crystals exist in a fine-grained matrix, usually of micro-crystalline or felsitic structure. In specimens, the quartz appears as small rounded, clear, greyish, vitreous blebs, which are crystals, double hexagonal pyramids, with their edges and corners rounded by resorption or corrosion. Under the microscope they are often seen to contain rounded enclosures of the ground-mass or fluid cavities, which are frequently negative crystals with regular outlines resembling those of perfect quartz crystals. Many of the latter contain liquid carbonic acid and a bubble of gas that may exhibit vibratile motion under high magnifying powers. Variants In addition to quartz there are usually phenocrysts of feldspar, mostly orthoclase, though a varying amount of plagioclase is often prese ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Grand Duchy Of Baden
The Grand Duchy of Baden (german: Großherzogtum Baden) was a state in the southwest German Empire on the east bank of the Rhine. It existed between 1806 and 1918. It came into existence in the 12th century as the Margraviate of Baden and subsequently split into the states of Baden-Durlach and Baden-Baden, which were reunified in 1771. It then became the much-enlarged Grand Duchy of Baden after the dissolution of the Holy Roman Empire from 1803 to 1806 and was a sovereign country until it joined the German Empire in 1871. In 1918, it became part of the Weimar Republic as the Republic of Baden. Baden was bordered to the north by the Kingdom of Bavaria and the Grand Duchy of Hessen-Darmstadt; to the west, along most of its length, by the river Rhine, which separated Baden from the Bavarian Rhenish Palatinate and Alsace in modern France; to the south by Switzerland; and to the east by the Kingdom of Württemberg, the Principality of Hohenzollern-Sigmaringen and Bavaria. After ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rhenish Bavaria
The Palatinate (german: Pfalz; Palatine German: ''Palz'') is a region of Germany. In the Middle Ages it was known as the Rhenish Palatinate (''Rheinpfalz'') and Lower Palatinate (''Unterpfalz''), which strictly speaking designated only the western part of the Electorate of the Palatinate (''Kurfürstentum Pfalz''), as opposed to the Upper Palatinate (''Oberpfalz''). It occupies roughly the southernmost quarter of the German federal state of Rhineland-Palatinate (''Rheinland-Pfalz''), covering an area of with about 1.4 million inhabitants. Its residents are known as Palatines (''Pfälzer''). Geography The Palatinate borders Saarland in the west, historically also comprising the state's Saarpfalz District. In the northwest, the Hunsrück mountain range forms the border with the Rhineland region. The eastern border with Hesse and the Baden region runs along the Upper Rhine river, while the left bank, with Mainz and Worms as well as the Selz basin around Alzey, belong to th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pseudomorph
In mineralogy, a pseudomorph is a mineral or mineral compound that appears in an atypical form (crystal system), resulting from a substitution process in which the appearance and dimensions remain constant, but the original mineral is replaced by another. The name literally means "false form". Terminology for pseudomorphs is "''replacer'' after ''original''", as in ''brookite'' after ''rutile''. Substitution pseudomorph An infiltration pseudomorph, or substitution pseudomorph is a pseudomorph in which one mineral or other material is replaced by another. The original shape of the mineral remains unchanged, but color, hardness, and other properties change to those of the replacing mineral. An example of this process is the replacement of wood by silica (quartz or opal) to form petrified wood in which the substitution may be so perfect as to retain the original cellular structure of the wood. An example of mineral-to-mineral substitution is replacement of aragonite twin crystal ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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