Aluminum beryllium silicate

Romannikov et al. studied the catalytic properties of beryllium-silicates with a zeolite-type structure. Methanol conversion yielded primarily olefins, while on the isostructural aluminum-silicate catalyst paraffins and aromatics were obtained. The methanol conversion was considerably higher on the [AlJ-ZSM-5 than on the [Be]-ZSM-5, except in one example (Table 12). 

Minerals belonging to the category of insoluble oxide and silicate minerals are many in number. Insoluble oxide minerals include those superficially oxidized and those of oxide type. The former category comprises mainly superficially oxidized sulfide minerals, including metals such as aluminum, tin, manganese, and iron which are won from their oxidic sources. As far as silicate minerals are concerned, there can be a ready reference to several metals such as beryllium, lithium, titanium, zirconium, and niobium which are known for their occurrence as (or are associated with) complex silicates in relatively low-grade deposits. 

A colorless mineral known as corundum (composed of aluminum oxide) is colorless. A red variety of corundum known as ruby, a precious stone, owes its color to impurities of chromium within the crystal structure of corundum. Blue and violet varieties of corundum are classified as sapphires, the blue being the result of iron and titanium impurities, and the violet of vanadium impurities within the corundum crystal structure. Another colorless mineral is beryl (composed of beryllium aluminum silicate) but blue aquamarine, green emerald, and pink morganite, are precious varieties of beryl including different impurities aquamarine includes iron, emerald chromium and vanadium, and morganite manganese. 

Mineral gemstones that have the same basic chemical composition, that is, are composed of the same major elements and differ only in color, are considered as variations of the same mineral species. As gemstones, however, minerals that have the same composition and crystalline structure but exhibit different colors are classified as different gemstones. Beryl, for example, a mineral (composed of beryllium aluminum silicate), includes a pink variety, known by the gemstone name of morganite, and also a well-known green variety, emerald. Table 18 lists and classifies, by composition and color, gemstones that have been appreciated since antiquity. 

Beryllium oxide (BeO) is a beryllium compound produced in significant commercial quantities. The chemical process starts with minerals containing aluminum silicate and silicon dioxide and undergoes a number of chemical reactions, some at high temperatures, to end up with BeO. 

Since yttria, as well as glucina, forms sweet salts, Klaproth preferred to call the latter earth berylha, and it is still known by that name. Beryl and the emerald are now known to be a beryllium aluminum silicate [Be3Al2(Si03)6]. 

SYNS BERYLLIUM ALUMINOSILICATE BERYLLIUM ALUMINUM SILICATE BERYL ORE... 

Write the formulas for the following salts, by referring to Table 10-1 show the charges on the metal ion and on the complex anions sodium sulfate calcium silicate barium perchlorate beryllium carbonate aluminum nitrate aluminum sulfate aluminum phosphate potassium chlorate potassium sulfite. 

Beryllium aluminum oxide (BeAlgOj ) Beryllium aluminum oxide (BeAlgOj g) Beryllium aluminum oxide (BeAlgO ) Aluminum silicate, niullite (AlgSi20j 3>... 

Special Refractories.— Under certain conditions refractories of special qualities may be employed such as zirconium oxide, zirconium silicate, chromite, fused silica, boron nitride, aluminum nitride, lime, beryllium oxide, cerium dioxide, thoria, asbestos and various synthetic combinations. 

Be AljSiPj, Beryllium aluminum silicate (Beryl) 33=5.95 297 7x10 ... 

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