Siliceous limestone

A porous siliceous rock resulting from the decomposition of chert or siliceous limestone. Used as a base in soap and scouring powders, in metal polishing, as a filtering agent, and in wood and paint fillers. A cryptocrystalline form of free silica. 

Further investigations were carried out over a large lead-zinc ore body in China, in which ore zones occur in both flanks of a reverse anticline. The ore is richer in the eastern flank, where it is controlled by an interlayer breccia zone. Smaller amounts of ore occur in fractures and fissures in siliceous limestone. The ore body is buried beneath 350 m of barren rock in the south and warps up northward, where it is buried beneath 250 m of barren rock.. The ore is richer in the north than in the south. The hangingwall rocks are conglomerates and red-bed sediments, in which interstitial water is abundant. The topography of the area is mgged. The soil is brick red and 0.8 to 10 m thick. 

Rotten stone A friable siliceous stone, the residue of a siliceous limestone whose calcerous matter has been removed by the solvent action of water. Also called trlpoll. 

Natural hydraulic limes are limes produced by burning, at below 1250 °C, of more or less argillaceous or siliceous limestones, with reduction to powder by slaking with or without grinding. They consist of calcium silicates, calcium aluminates and calcium hydroxide. 

Oligocene 35 Devon ball-clays Siliceous limestone, lignite... 

A series of additional filler systems merit brief discussion, not because of their reinforcement qualities but because of their high consumption. These include kaolin clay (hydrous aluminum silicate), mica (potassium aluminum silicate), talc (magnesium silicate), limestone (calcium carbonate), and titanium dioxide. 

Rottenstone ra-t n- Ston (1677) n. Brown, amorphous, siliceous limestone, similar in nature to pumice stone, but softer in texture. Principal uses are as an abrasive and filter medium. 

Such investigations assume greater importance in dealing with siliceous limestones. For such materials it is necessary to ascertain the distribution of the quartz in the limestone matrix. The type of intergrowth and the grain size of the constituents can be determined in thin sections under the microscope. 

There are few data from trials on residual resistances of masonry but those available indicate that clay bricks do not lose strength to 1000 °C while the concrete and the siliceous limestone bricks lose about 75% of its resistance and mortar does not have residual strength at 1000 °C [14]. 

Some of them set limits of loss of strength, upper and lower, depending on the type of aggregate (siliceous limestone, sand, etc.) that mainly make the mortar [29,48]. Others specify the loss of strength of the material considering that it is a type of ordinary mortar [37] or a pre-dosage mortar. 

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