Dolomite: Dolomite forms through the process of dolomitization, where magnesium-rich fluids interact with pre-existing limestone or lime-rich sediments. …
Naming and Discovery. The earliest description of dolomite is attributed to Carl Linnaeus is 1768, but the first meaningful descriptions were presented by the French geologist Déodat Gratet de Dolomieu (1750-1801), who is known to have recorded them from buildings in Rome circa 1791, and collected samples from the Alps in northern Italy. …
Dolomite is a common mineral. It is also known as CaMg (CO 3) 2 and is a type of compact limestone consisting of a calcium magnesium carbonate. In combination with calcite and aragonite, dolomite makes up approximately 2% of the earth's crust. The mineral was first described by and then named after the French mineralogist and geologist Deodat ...
The crystal structure of dolomite is similar to calcite with Mg ions substituting for Ca in every other layer. To accommodate this substitution, due to differences in bond lengths between Ca–CO 3 and Mg–CO 3 (238 pm versus 208 pm, respectively), CO 3 in the Mg layer is uniformly rotated about the threefold axis relative to calcite (Reeder and …
Dolomite is a mineral and a rock-forming mineral that is composed of calcium magnesium carbonate (CaMg(CO3)2). It is named after the French mineralogist Déodat Gratet de Dolomieu, who first …
En résumé, la dolomite se forme par le processus de dolomitisation, où les fluides riches en magnésium interagissent avec les minéraux de carbonate de calcium …
Dolomite is a sedimentary rock with a high percentage of dolomite mineral, CaMg (CO3)2. It is a carbonate rock that is often associated with limestone and evaporites. However, the rock is less …
Dolostone, also known as dolomite (not to be confused with the mineral dolomite), is a type of carbonate sedimentary rock consisting predominantly of dolomite [CaMg(CO 3) 2] and to a lesser extent of other carbonates, like calcite and aragonite. Like the mineral, the name derives from the French mineralogist Déodat Gratet de Dolomieu, after whom also …
En outre, ces eaux sont sursaturées par rapport à la calcite et à la dolomite. En général, les indices de saturation de la plupart des minéraux augmentent dans le sens de l'écoulement. ... .000 mg/l dans la direction d'un écoulement vers le nord-nord-est. L'accroissement de la salinité est attribuée aux processus de dissolution, ...
Il s'agit de processus de surface. La phase II est associée à la circulation de l'eau, à la mobilité des ions ions dans les sédiments et aux processus chimiques (épigenèse). Début de la ...
Dolomite is even used in facial creams and toothpaste. Usually minerals are named after a famous geographic locality where they occur, but dolomite was named for a French geologist named Deodat de Dolomieu (1750-1801) who first identified its chemical composition, and whose scientific career had a rather inauspicious beginning.
Three years later the naturalist Richard Kirman introduced the Dolomite as a new mineral; the name from there became used to name the dolostone rocks and finally …
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dolomite, type of limestone, the carbonate fraction of which is dominated by the mineral dolomite, calcium …
Dolomite is a calcium magnesium carbonate with the chemical composition CaMg (CO 3) 2, constituting a rock-forming mineral found in abundance around the world. It has numerous commercial uses. Dolomite mineral is rarely found in modern sedimentary environments; however, dolomite rocks (dolostones) are common in geological history.
dolomite, Type of limestone, the carbonate fraction of which is dominated by the mineral dolomite, calcium magnesium carbonate CaMg(CO 3) 2.The carbonate mineral dolomite occurs in marbles, talc schists, and other magnesium-rich metamorphic rocks. It occurs in hydrothermal veins, in cavities in carbonate rocks, and less often in various sedimentary …
Fig. 10 : Processus diagénétiques associés aux milieux marins de faible profondeur. ... L'eau de mer, bien que sursaturée vis-à-vis de la dolomite, ne correspond pas à ces conditions et, d e .
Elle permet de renforcer la biodiversité des formes posologiques solides administrables par voie orale. Pour obtenir une poudre très fine de dolomite, la roche est pulvérisée par micronisation. Il s'agit d'un processus de broyage à jet qui va transformer la roche dolomite en de petites particules de l'ordre du micron.
Dolomite, or dolostone, is a carbonate sedimentary rock made mostly from the mineral dolomite, CaMg (CO3)2. It commonly occurs in association with limestone and shares many of the same properties, but reacts only weakly with acid. Dolomite often has a sugary texture and is typically off-white to gray in color.
Dolomite as a rock type was first described in 1791 by a French geologist Déodat de Dolomieu who investigated samples from the Italian Alps 2. Dolomite rock has been called "dolomites" (in plural), especially in the literature published before 1990, but the term "dolomites" should be used only for different types of dolomite 4.
La dolomite est un minéral et un minéral formant des roches composé de carbonate de calcium et de magnésium (CaMg(CO3)2). Il porte le nom du minéralogiste français Déodat Gratet de Dolomieu, qui a décrit pour la première fois ses propriétés à la fin du XVIIIe siècle. La dolomite se trouve souvent dans les formations rocheuses …
Dolomite. Dolomite is a calcium magnesium carbonate mineral which has many characteristics similar to calcite. In places where access to limestone is not available or more costly, dolomites are used in its place for the …
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Processus de salinisation des eaux souterraines dans le bassin Sahel Doukkala (Maroc occidental) ... contrôlée par l'équilibre entre calcite et dolomite et fortement dépendante de la température (Land, 1987 in Fidelibus et al. 1996). La réduction des sulfates 7 favorise la dissolution des minéraux carbonatés.
Field features. Dolomite occurs in many carbonate rocks like the homonymous dolomite (alternatively known as dolostone) and dolomite marble. Dolomite often coexists with calcite, which has nearly identical …
To decode the enigma of ancient dolomite, we examined a modern dolomite forming environment, and found that a cyclic shift in microbial community …
The impressive massif of the Dolomite Mountains in Northern Italy was formed almost entirely of CaMg(CO 3) 2, a calcium-magnesium carbonate mineral discovered in 1791 by the French naturalist Déodat de Dolomieu (), who gave name to both the mineral—dolomite—and to the impressive Alpine rocky landscape considered by …
Representative cores in different stages of the dolomitization process showing distinctive porosity development. (a) Dolomitic limestone showing no porosity …
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A trial to get Dolomitein freshwaterUn essai d'obtention de Dolomite en eau continentale. Microbial production and precipitation of Mg and Ca carbonates were studied in a freshwater pond in responseto addition of Mg and Ca acetates which was intended to favour dolomite production. Hydrochemical data and bacterial population variations …
Natural Mineral Catalysts. The natural catalysts used for the cracking upgrading process of biomass gasification include dolomite, olivine, limestone, magnesite, zeolite and clay minerals. Dolomite, a concoction of calcium and magnesium carbonate with a molecular formula of CaMg (CO 3) 2, is found abundantly in igneous and epimorphic rocks in ...
Occurrence of authigenic dolomite and erzbergite in young fractures. The sedimentary and tectonic evolution of the Erzberg iron ore deposit is marked by Variscan age nappe stacking of Silurian and ...
Dolomitization, process by which limestone is altered into dolomite; when limestone comes into contact with magnesium-rich water, the mineral dolomite, calcium and magnesium …
base et les processus de précipitation des minéraux carbonatés (calcite, dolomite et aragonite) sont généralement à l'origine de la grande variabilité des concentrations des cations (Ca 2 ...
Dolomite [CaMg (CO 3) 2] is the second most abundant carbonate in carbonate rocks after calcite. Dolomite is named after Déodat Gratet de Dolomieu (1750 – 1801), a French geologist who first described this mineral and the carbonate rocks of the Dolomites, in Northern Italy, which are also named after him. Except for some relatively rare ...
Les indices de saturation des eaux vis-à-vis des minéraux montrent que les processus géochimiques qui gouvernent la minéralisation des eaux sont : la dissolution des évaporites (halite, gypse ...