#NePas > musées + limites on Pinterest | Madrid, Georges Braque and Natural history. #ThinSectionThursday Instagram posts - Gramho.com. (7) Oregon Museum of Science and Industry (OMSI) was... - Oregon Museum of Science and Industry (OMSI) (Thread of images) Tryna find proof of employment for somewhere I worked >5 yrs ago, came across these petrological thin sections I drew at university instead. Hours spent in the lab every week staring into a microscope for these! #geology #petrology.
(Thread of images) Tryna find proof of employment for somewhere I worked >5 yrs ago, came across these petrological thin sections I drew at university instead. Hours spent in the lab every week staring into a microscope for these! #geology #petrology. 100 Websites You Should Know and Use. In the spring of 2007, Julius Wiedemann, editor in charge at Taschen GmbH, gave a legendary TED University talk: an ultra-fast-moving ride through the “100 websites you should know and use.”
Six years later, it remains one of the most viewed TED blog posts ever. Time for an update? We think so. Below, the 2013 edition of the 100 websites to put on your radar and in your browser. To see the original list, click here. While most of these sites are still going strong and remain wonderful resources, we’ve crossed out any that are no longer functioning. And because there are so many amazing resources out there, please add your own ideas in the comments. And now, the original list from 2007, created by Julius Wiedemann, editor in charge at Taschen GmbH. 1911 Encyclopædia Britannica/Petrology. PETROLOGY, the science of rocks (Gr. πέτρος), the branch of geology which is concerned with the investigation of the composition, structure and history of the rock masses which make up the accessible portions of the earth's crust. Rocks have been defined as “aggregates of minerals.”
They are the units with which the geologist deals in investigating the structure of a district. Some varieties cover enormous areas and are among the commonest and most familiar objects of nature. Granite, sandstone, clay, limestone, slate often form whole provinces and build up lofty mountains. Such unconsolidated materials as sand, gravel, clay, soil are justly included among rocks as being mineral masses which play an important role in field geology. Other rock species are of rare occurrence and may be known in only one or two localities in distant parts of the earth’s surface. Treatment of the Subject. Composition. Structure. Origin of Rocks. Methods of Investigation. Rock Classification. Types of Structure. 1911 Encyclopædia Britannica/Petrology. 2.4 Silicate Minerals – Physical Geology. The vast majority of the minerals that make up the rocks of Earth’s crust are silicate minerals.
These include minerals such as quartz, feldspar, mica, amphibole, pyroxene, olivine, and a great variety of clay minerals. The building block of all of these minerals is the silica tetrahedron, a combination of four oxygen atoms and one silicon atom. These are arranged such that planes drawn through the oxygen atoms form a tetrahedron (Figure 2.6). Since the silicon ion has a charge of +4 and each of the four oxygen ions has a charge of –2, the silica tetrahedron has a net charge of –4. In silicate minerals, these tetrahedra are arranged and linked together in a variety of ways, from single units to complex frameworks (Figure 2.9). The simplest silicate structure, that of the mineral olivine, is composed of isolated tetrahedra bonded to iron and/or magnesium ions. Figure 2.9 Silicate mineral configurations. Exercises Exercise 2.3 Make a Tetrahedron Exercise 2.4 Oxygen Deprivation. 20 objets du quotidien vu par un UX designer [Design Collection #1] 30+ Thin Section Photos That Will Develop Your Interest in Petrography ~ Learning Geology.
30+ Thin Section Photos That Will Develop Your Interest in Petrography A “thin section” of rock is a sample that is mounted to a microscope slide and cut so thin that you can see light through it. The process of creating a thin section is a blend of artistry, technology and science. The art of preparing thin sections has been critical to understanding the core samples that scientists are observing. Thin section samples allow scientists to observe minerals in rocks, their crystal structure and texture at a microscopic level. Want to revise how do geologists study rock? In this blog, we're taking you into the journey of thin section photos that were captured and given by students and young professionals from Finland, Ireland, Denmark, Czech Republic and Plymouth (UK).
Note: We are using following thin section photos by having permission from their owners. 1. 2. 3. 4. 5. 6. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. 29. 31. 32. Like this article? 1. 3D Block diagrams and texture mapping (using some non-free software) | Geological Mapping Technician, Department of Geology. For this exercise we will be making a diagram using adobe illustrator (not-free) and sketchup (free). We will create a blank rectangular prism in sketchup and then make textures to add to faces using adobe illustrator. Texture is the 3D modelling term for the surface detail (image) of an object. Concept stage Start by drawing a sketch of the model you want to make.
In this example I will be making a simple model of a reverse fault. You should make a different kind of model. Make the blank rectangular prism in Sketchup It’s a good idea to look around for an intro sketchup tutorial for the OS and software version you are using before you get started. Setting up the template view When you open sketchup you will see a splash screen that prompts you to choose which type of environment you want to use. Draw a rectangular prism Measure the length of the sides of the concept sketch you drew. In sketchup click on the shapes tool and then choose the Rectangle tool from the dropdown menu. 5 outils gratuits pour compresser vos PDF. En poursuivant votre navigation sur ce site, vous acceptez nos CGU et l'utilisation de cookies afin de réaliser des statistiques d'audiences et vous proposer une navigation optimale, la possibilité de partager des contenus sur des réseaux sociaux ainsi que des services et offres adaptés à vos centres d'intérêts.
Pour en savoir plus et paramétrer les cookies... Accueil GeoffroyOndet Journaliste, telecharger.com Inscrivez-vous gratuitement à laNewsletter Actualités Partagez facilement vos fichiers PDF volumineux par email grâce à ces cinq outils gratuits pour réduire la taille de vos documents. Si vous avez déjà essayé de scanner des documents de plusieurs pages pour les envoyer par email, vous avez peut-être été confronté à un terrible problème : le poids du fichier de 50 pages que vous venez de numériser est bien trop important pour passer dans un courrier électronique. 1. Télécharger FileOptimizer pour Windows (Gratuit) 2. Les - - Limité à deux documents par heure Utiliser Smallpdf (Gratuit) 5 sites pour télécharger des vidéos libres de droits • Les Outils Tice.
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Pexels Videos C’est un des sites les plus connus et un des plus utilisés aussi. À côté de sa banque d’images fixes, Pexels a développé une archive de vidéos librement utilisables. MixKit C’est le dernier venu de cette liste de banque de vidéos gratuites et libres de droits. Videvo Videvo offre des milliers de vidéos libres de droits fournies par sa communauté d’utilisateurs. Videezy Les images de Videezy sont libres de droits pour un usage personnel et commercial, mais vous êtes invités à mentionner ‘Videezy.com’ dans vos projets en cas d’utilisation. Coverr. 9/01/2018 -- Earthquake activity across Pacific -- Reaching towards USA + Europe -- Keep Watch. A Berlin, la bibliothèque retourne à l’état sauvage.
Dans la capitale allemande, des cabines téléphoniques customisées qui permettent d’échanger gratuitement des livres rencontrent un beau succès. En cette caniculaire fin d’été berlinois, les rails rouillés restent silencieux sous le soleil de plomb. Rien ne distinguerait le quai 17 de la gare de Grunewald des autres sites ferroviaires désaffectés qui parsèment la capitale allemande, si ce n’est sa sinistre portée historique : de ce point sont partis, entre 1941 et 1945, plus de 50 000 Juifs à destination des camps de la mort. Sur le quai, une macabre chronologie est gravée dans le métal : « 12.11.1943 / 1 190 Juifs / Auschwitz », « 29.11.1943 / 1 000 Juifs / Auschwitz »… Un lieu à la symbolique puissante pour installer une bibliothèque sauvage. En face de la gare – dont les autres voies sont toujours en activité et transportent les voyageurs en direction de la ville de Potsdam –, une cabine téléphonique fatiguée attend patiemment la visite de lecteurs vagabonds.
A Practical Introduction to Optical Mineralogy - Colin Gribble - Google Books. Accessoires for the paranoid. Accessoires for the paranoid An alternative approach to data security. When considering data as the oil of the 21st century, each of us is sitting on a small ground treasure—a resource that is being discretely mined by the most valuable companies in the world. As users of modern services and products, we have long become habituated to trade-offs in which "free" services are offered in exchange for some bits of our personal data. The IoT has introduced a new kind of object into our homes whose functioning greatly depends on collecting such information: Products that are able to observe the users, have the ability to learn from their observations and then make their own decisions without further human interference.
With the comfort of automation also comes a subtle danger in our connected devices which process personal information about their users every day. The "Accessories for the Paranoid" explore an alternative approach to data security. Object C: leaving fault traces Köln, 2017. ALEX STREKEISEN. Extrusive rock, any rock derived from magma (molten silicate material) that was poured out or ejected at the Earth’s surface. By contrast, intrusive rocks are formed from magma that was forced into older rocks at depth within the Earth’s crust; the molten material then slowly solidifies below the Earth’s surface, where it may later be exposed through erosion.
Extrusive rocks are usually distinguished from intrusive rocks on the basis of their texture and mineral composition. The main factor that determines the texture of an igneous rock is the cooling rate (dT/dt). Other factors involved are: • The diffusion rate - the rate at which atoms or molecules can move (diffuse) through th liquid. • The rate of nucleation of new crystals - the rate at which enough of the chemical constituents of a crystal can come together in one place without dissolving. • The rate of growth of crystals - the rate at which new constituents can arrive at the surface of the growing crystal. 1. Magmatic series. ALEX STREKEISEN-Amygdales- Amygdules or amygdales form when the gas bubbles or vesicles are infilled with a number of different secondary mineral, depending on the groundwater chemistry and the physical conditions underground. The word is derived from the Latin ("amygdala") words for almond, reflecting the typical shape of an infilled vesicle.
Amygdules usually form after the rock has been emplaced, and are often associated with low-temperature alteration. Amygdules may often be concentrically zoned.Secondary minerals are often: chalcedony or agate, Calcite, Hematite and Zeolite. the zeolite minerals are famous for their occurrences in amygdules. Rocks containing amygdules can be described as amygdaloidal. some of the amygdules are stretched, not round. These started out as spherical vesicles and were deformed while the lava was still fluid. Amygdules and vesicles thus can be indicators of movement in ancient lavas. Amygdaloidal basalt with amygdales filled by Zeolite. Bibliography. ALEX STREKEISEN-Amygdales- ALEX STREKEISEN-Glomerophyric- Glomeroporphyritic or glomerophyric is a term used to describe a porpyritic texture in which phenocrysts are clustered into aggregates called glomerocrysts or crystal clots. Glomeroporphyritic textures are common and often included plagioclase and pyroxenes in basic rocks.
They form by a processes known as synneusis, where accumulation of crystals occurs by surface tension and fixing by interpenetration due to crystal growth. Glomerocrysts are an important consideration in crystal fractionation by crystal settling since the density of the glomerocryst is an average of that of its constituent phases. Formation of glomerocrysts may in part explain the settling of plagioclase in basic intrusions in which plagioclase crystals are less dense than the surrounding magma. The glomerocryst play an important role in the fractionation process, being heavier than the individual crystals of which they consist, they are more prone to sinking in the magma. V = 2R2 (de - di)g /9η Bibliography. ALEX STREKEISEN-Hypocrystalline- Hypocrystalline is a textural term describing an igneous rock consisting of a mixture of glass and crystals where the ratio of crystals to glass is greater than 3:5. Rocks containing a higher ratio of glass are described as hypohaline or holohyaline.
Usually devitrified glass is treated as glass in the classification of hypohyaline rocks. Bibliography • Cox et al. (1979): The Interpretation of Igneous Rocks, George Allen and Unwin, London. • Howie, R. A., Zussman, J., & Deer, W. (1992). An introduction to the rock-forming minerals (p. 696). Longman. • Le Maitre, R.
ALEX STREKEISEN-Hypocrystalline- ALEX STREKEISEN-Kyanite- Named in 1789 by Abraham Gottlieb Werner from the Greek word "kyanos", meaning "blue," the common color of the species. Kyanite (also know as disthene) is a mineral, commonly found in aluminium-rich metamorphic rocks. Kyanite in metamorphic rocks generally forms at medium to high pressures and low to moderate temperatures in regional metamorphism of Barrowian type. At higher temperatures Kyanite inverts to Sillimianite, over a wide range of pressures and high temperatures.
The minerals kyanite, Adalusite and sillimanite are polymorphs of AlSi2O5, each occurring under different temperature-pressure regimes and are therefore rarely found together in the same rock. All three polymorphs can be used as index minerals in metamorphic rocks. They all develop in alumina-rich pelites under different conditions of temperature and pressure. 3(Al2O3*SiO2) → 3Al2O3*2SiO2 + SiO2. Kyanite crystals are formed according to triclinic crystal symmetry. the structure of kyanite is very complex. Bibliography. ALEX STREKEISEN-Perthite- Named for the nearby city of Perth in Ontario. The type locality is 9.5 km southwest of Perth. A perthite is an intimate intergrowth of sodic and potassic feldspar resulting from subsolidus exsolution (unmixing of two minerals). Strictly speaking a perthite has blebs or irregular lamellae of sodic feldspar within potassic alkali feldspar, however, the term perthite is often used to describe all types of exsolution in the feldspars.
An antiperthite is an intergrowth arising due to exsolution where potassic feldspar is present as blebs or lamellae within a sodic feldspar. The term mesoperthite is used when sodic and potassic feldspars are in broadly equal anbundance. Perthite that can only be observed with the aid of a microscope is known as microperthite. Many minerals that show complete solid solution at higher temperatures do not show such solid solution at lower temperatures. Phase diagram of the alkali feldspar system which exhibits such exsolution behavior at low temperatures. ALEX STREKEISEN-Plagioclase- ALEX STREKEISEN-Plagioclase- ALEX STREKEISEN-Sieve- ALEX STREKEISEN-Staurolite- An Introduction to Geology – Free Textbook for College-Level Introductory Geology Courses. Andesite Lava, Krakatau. (Krakatoa) Indonesia. Thin Section Microscope Slide - Geosec. Andesite Lava, Krakatau. (Krakatoa) Indonesia. Thin Section Microscope Slide - Geosec. Andesite thin section - Igneous Rocks - MicROCKScopic.
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