Marble amount

Marble. The word marble is used as the common name for two types of monomineral rocks one derived from limestone and therefore composed of calcium carbonate, the other derived from dolomite and composed of calcium magnesium carbonate. Extremely high pressures and heat during past geological times modified the structure of both limestone and dolomite, compacting them into a characteristic crystal structure. Most marble is white however, minor and trace amounts of metallic impurities cause the formation of stains in a variety of colors, hues, and patterns, or of colored marble. 

Limestone varieties differ greatly from one another in their texture and the impurities they contain, and consequently they also differ in color. The color of limestone may vary from white (when it contains practically no impurities) to off-white and even to intensely colored. Minor inclusions within the limestone structure are often of silica, usually in a concentration below 5%, as well as feldspar and clay in still lesser amounts. Many types of limestone also include embedded fossils. Much limestone deposits in the outer crust of the earth are altered during geologic metamorphic processes that involve mainly pressure and heat but also liquids and gases. Marble, for example, a metamorphic rock derived from calcium carbonate, is white when composed only of this substance colored metal ions and other impurities impart to marble a wide range of colors such as red, yellow, and green and also give... 

These marbles show equigranular granoblastic texture, and according to Ogasawara et al. (2000), are characterized by the absence of graphite and diamond. They consist mainly of Mg-calcite + dolomite +forsterite + diopside + Ti-clinohumite. Garnet is replaced by symplectite of diopside, spinel and Mg-calcite, plus minor amounts of pyrrhotite, pyrite and chalcopyrite. 

Example 12.5. The stabilizing effect of powders was impressively demonstrated by making liquid marbles in air [549], Liquid marbles (Fig. 12.11) are obtained by making a small amount of water (typically 1 mm3) roll on a very hydrophobic powder. The powder particles go into the interface and completely coat it so that, after spontaneous formation of the spherical drop, only the solid caps of powder particles come into contact with the solid support. 

Bile-acid metabolism explains the ability of certain kinds of dietary fiber to help lower serum cholesterol. A molecule of bile acid circulates through the liver and intestine five or more times before finally being eliminated. Soluble fiber (such as that found in oat bran) binds bile acids, but itself cannot be absorbed. Therefore, fiber-bound bile acids are eliminated in the stool. Because bile acids derive from cholesterol, synthesizing more bile acid drains the body s stores of cholesterol, which leads to a reduction in serum cholesterol, and therefore, to a lower risk of coronary artery disease. Eating oat fiber cannot overcome an excessive dietary cholesterol consumption, of course. In other words, consuming excessive amounts of well-marbled steak and expecting to overcome the effects by eating a bran muffin would be foolish. 

Ancient artists knew of two other intensely blue pigments and these were made from the minerals azurite and lapis lazuli. Azurite is a variant of basic copper carbonate. Lapis lazuli is more complex and is a silicate rock with variable amounts of aluminium, sodium, calcium, and sulfur and was known as ultramarine. This mineral is found alongside marble and is produced when rock becomes heated under great pressure. It was mined only at Badakshan, Afghanistan,8 1 and such was its rarity in Europe that it was worth its weight in gold. It was imported via Venice and many believed it was being secretly manufactured in that city. Such was the beauty and depth of its colour that... 

Manufacturers of floor coverings make use of the banks to produce marbled effects in the products. In essence in this method, heated granules in contrasting colours are added to a bank in a manner calculated to give minimum dispersion in order to ensure that the effect required (and no other) is obtained it is essential to control strictly the amount of working to which the added materials are subjected. 

Prepare the amount ofcolor reagent you need—3 ml to he added to each tube containing 2 ml of carbamyl aspartate standard or enzyme assay mixture after addition of perchloric acid. Add 3 ml to each assay and standard tube and mix thoroughly. Cap the tubes with marbles or parafilm, carver them with aluminum foil, and store in a dark place at room temperature until the next lab period (15-48 hr is satisfactory). 

Clearly, there are real differences in ki between experiments. The highest value of ki is estimated from the data of Weyl (9 )y who directed a jet of CO2-saturated water (pH = 3.9) onto the surface of calcite. Weyl found that the rate of solution varied with the jet velocity. His rates imply that kj varies from 0.11 to 0.23 when velocity of the jet increases from 18 to 35 m sec The smallest value of k (.0073) is derived from the data of Tomlnaga et al. (10). These authors rotated a disk of marble in HCl solutions (0.1750 - 0.5317N) at 485 rpm. Rate of dissolution was followed by the volume of CO2 evolved. After an initial period for saturation of the acid with CO2, rate of gas evolved becomes linear in the cumulative amount of CO2 produced. Because the acid concentration decreased as calcite dissolved, we extrapolated the observed linear relation in CO2 production back to the initial condition to estimate Initial rates under known acid concentrations. Correction to pH via the Davies equation leads to the rates shown for these authors in Figure 6. 

On the other hand, what if you turned the bowl over and tried the same experiment by placing the marble on top at the center. You might succeed in balancing the marble for a short time, but eventually you will touch the table or a breeze will move the marble a small amount and it will fall. When this happens, the unit of marble and bowl comes apart and no oscillation can happen. In this case, the center of the bowl would be a point of unstable equilibrium, since you can balance the marble there, but the marble cannot return to that point when disturbed to keep the unit from disintegrating. 

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