what is dolomite stone

Dolomite practically does not give a reaction and does not dissolve, coming into contact with hydrochloric or acetic acid in a cold form. The fluxing mechanisms are generally attributed to density differences of the solutions involved and the permeability characteristics available for percolation through the precursor sediment. Other times, Dolomite is found alongside other high vibrational stones such as Phenacite, Moldavite, Quartz, or Herkimer Diamond. This results because the purity of some of the cation layers may be less than ideal—i.e., some of the “calcium layers” may contain magnesium, and some of the “magnesium layers” may contain some calcium. The most widely discussed models for dolomitization, either partial or complete, involve four chief variables: time, location with respect to the sediment-seawater interface, composition and derivation of the solutions involved, and fluxing mechanisms. Dolomite, like calcite, cleaves into six-sided polyhedrons with diamond-shaped faces. Except for models invoking formation of dolomite by direct precipitation, a process thought by most geologists to apply to only a small percentage of all dolostones, each model is based on the assumption that the dolomite of dolostones has been formed by conversion of CaCO3 sediment or sedimentary rocks to dolostone. Journal de Physique, vol.40, pp.161-173. May fluoresce white to pink under UV; triboluminescent. An alternative name sometimes used for the dolomitic rock type is dolostone. [12] This occurs as a result of magnesium complexation by carboxyl groups associated with organic matter. Please select which sections you would like to print: Corrections? Emeritus Professor of Geology, Central Michigan University, Mount Pleasant. It is, however, unclear which ones actually occur in the dolomite; some of them may occur within other mineral constituents of the analyzed rocks. Relations between lamellar twinning and cleavage planes in dolomite and calcite. What makes Dolomite stone more unique than a traditional marble material is its denser composition and tight grain structure, reducing the effects of etching and staining. It is an important petroleum reservoir rock, and serves as the host rock for large strata-bound Mississippi Valley-Type (MVT) ore deposits of base metals such as lead, zinc, and copper. (Connate refers to water that becomes enclosed within sediments upon their deposition; meteoric water is derived from the atmosphere as rain or snow, which often occurs in pore spaces within rocks.) Tabular crystals, often with curved faces, also columnar, stalactitic, granular, massive. Be on the lookout for your Britannica newsletter to get trusted stories delivered right to your inbox. It is a calcium magnesium carbonate with a chemical composition of CaMg(CO3)2. Dolomite is used as an ornamental stone, a concrete aggregate, and a source of magnesium oxide, as well as in the Pidgeon process for the production of magnesium. Manganese also substitutes for magnesium, but typically only to the extent of a few percent and in most cases only along with iron. [18], Deer, W. A., R. A. Howie and J. Zussman (1966). 3 directions of cleavage not at right angles. Dolomite, type of limestone, the carbonate fraction of which is dominated by the mineral dolomite, calcium magnesium carbonate [CaMg(CO3)2]. Dolomite is a very common mineral, and is known for its saddle-shaped curved crystal aggregates. Klein, Cornelis and Cornelius S. Hurlbut Jr., "Evidence in the Japan Sea of microdolomite mineralization within gas hydrate microbiomes", "Surface chemistry allows for abiotic precipitation of dolomite at low temperature", "Low-temperature nucleation of magnesite and dolomite", A Review of the Literature on Catalytic Biomass Tar Destruction, Short Sharp Science: Particle quest: Hunting for Italian WIMPs underground, https://en.wikipedia.org/w/index.php?title=Dolomite_(mineral)&oldid=991261476, Inconsistent wikidata for Commons category, Creative Commons Attribution-ShareAlike License, White, gray to pink, reddish-white, brownish-white; colourless in transmitted light. Because dolomite contains relatively minor quantities of radioactive materials, it can insulate against interference from cosmic rays without adding to background radiation levels. The mineral dolomite is closely related to huntite Mg3Ca(CO3)4. https://www.britannica.com/science/dolomite-mineral, J.C. Deelman - Original Text of Low-temperature formation of Dolomite and Magnesite by J.C. Deelman. Dolomite is a sedimentary stone, which means it was formed on the surface of the earth, as opposed to granite, for example, which is formed in magma chambers under the earthʼs surface. There are not many places on the territory of Russia wherethe stone of the dolomite rock is mined. This is as hard as quartz, but it is different in that it does not, unless after a few minutes, effervesce with "aqua forti"". The dolomite of most dolostones is granular, with the individual grains ranging in size from microscopic up to a few millimetres across. Along with calcite and aragonite, dolomite makes up approximately 2 percent of the Earth’s crust. Another important variable is the presence of dissolved sulfate (SO4− 2) ions, as this retards the dolomitization process. [11] However, low-temperature dolomite may occur in natural environments rich in organic matter and microbial cell surfaces. As mentioned above, the origin of dolomite-rich rocks in marine sequences remains an unresolved problem of petrogenesis. One example is that of the formation of dolomite in the urinary bladder of a Dalmatian dog, possibly as the result of an illness or infection.[15]. Dolomite is a type of limestone. [8] Crystal twinning is common. Dolomite is a double carbonate, having an alternating structural arrangement of calcium and magnesium ions. Dolomite effervesces with dilute hydrochloric acid, but slowly rather than vigorously as calcite does; in general, it appears to smolder slowly, and in some cases it does so only after the rock has been powdered or the acid warmed, or both. DOLOMIT STONE GENERAL FEATURES. Granular dolomite in rocks tends to be light to dark gray, tan, or white. It is an important petroleum reservoir rock, and serves as the host rock for large strata-bound Mississippi Valley-Type (MVT) ore deposits of base metals such as lead, zinc, and copper. In the laboratory, staining techniques, also based on chemical properties or typical compositions, may be used to distinguish between these minerals. The general principle governing the course of this irreversible geochemical reaction has been coined "breaking Ostwald's step rule". Author of. Gaining popularity as a material for countertops and other residential and commercial applications, dolomite natural stone offers durability and an elegant aesthetic for modern design enthusiasts. Especially, in the sectors that use steel in the industry dolomite stone located in Turkey. Other cations known to substitute—albeit in only relatively minor amounts—within the dolomite structure are barium and lead for calcium and zinc and cobalt for magnesium. The dolomite present in dolomite veins has also been ascribed diverse origins; some appears to have been deposited by percolating connate or meteoric groundwater, and some seems more likely to have been deposited by hydrothermal solutions charged with magmatic volatiles. Hoc simile quartzo durum, distinctum quod cum aqua forti non, nisi post aliquot minuta & fero, effervescens." Most dolomites of ancient dolostones, however, appear to be well ordered. A high manganese content gives the crystals a rosy pink color. Unless it is in fine powder form, it does not rapidly dissolve or effervesce (fizz) in cold dilute hydrochloric acid as calcite does. It forms white, tan, gray, or pink crystals. Bacteria may also play a role in the formation of dolomite. Saussure le fils, M. de (1792): Analyse de la dolomie. The term protodolomite is frequently applied to Holocene dolomites (those formed during approximately the last 11,700 years) that have less than ideal dolomite structures. The desire for an understanding of dolomitization of sedimentary strata has been based on economic as well as scientific interests. However, as described for the potassium feldspars, dolomites—unlike calcites—may also exhibit order-disorder relationships. Some dolomite marbles are nearly pure dolomite. People take dolomite as a calcium and magnesium supplement. Dolomite has a Mohs hardness of 31/2 to 4 and a specific gravity of 2.85 ± 0.01. Dolomite is used as an ornamental stone, a concrete aggregate, and a source of magnesium oxide, as well as in the Pidgeon process for the production of magnesium. Dolomite, type of limestone, the carbonate fraction of which is dominated by the mineral dolomite, calcium magnesium carbonate. The lustre ranges from subvitreous to dull. Large quantities of processed dolo… Those laboratory experiments showed how the initial precipitation of a metastable "precursor" (such as magnesium calcite) will change gradually into more and more of the stable phase (such as dolomite or magnesite) during periodical intervals of dissolution and re-precipitation.

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