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Pure white marble is the result of metamorphism of a very pure (silicate-poor) limestone or dolomite protolith. The characteristic swirls and veins of many colored marble varieties, sometimes called striations , are usually due to various mineral impurities such as clay , silt , sand , iron oxides , or chert which were originally present as ...
The white- or yellow-bodied wares that appeared towards the very end of the Dawenkou phase were further developed in the Longshan period, and many white wares either anticipate the bronze forms of the Shang era or have features such as rivets that suggest imitation of metalworking techniques, probably of contemporary copper wares, of which no ...
Quartz is, therefore, classified structurally as a framework silicate mineral and compositionally as an oxide mineral. Quartz is the second most abundant mineral in Earth's continental crust, behind feldspar. [10] Quartz exists in two forms, the normal α-quartz and the high-temperature β-quartz, both of which are chiral. The transformation ...
Granitic rock with more than 60% quartz, which is uncommon, is classified simply as quartz-rich granitoid or, if composed almost entirely of quartz, as quartzolite. [5] [6] [7] Granite in thin section, under cross-polarized light. True granites are further classified by the percentage of their total feldspar that is alkali feldspar.
Fused quartz is used for high-temperature applications such as furnace tubes, lighting tubes, melting crucibles, etc. [74] However, its high melting temperature (1723 °C) and viscosity make it difficult to work with. Therefore, normally, other substances (fluxes) are added to lower the melting temperature and simplify glass processing.
The racial makeup of the city was 72.39% of the population were Hispanic or Latino of any race, 35.67% White, 4.9% White Persons not Hispanic, [7] 0.77% Black or African American, 1.38% Native American, 18.51% Asian, 0.12% Pacific Islander, 39.27% from other races, and 4.29% from two or more races. Mexican and Chinese were the most common ...
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