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Contamination introduced during rock sample powdering 391 tion Trace element abundance analysis ). The results are shown as blank quartz sand in Table 1. That quartz sand was pulverized using the mills as described above. The respective influences of contamination from the mills were determined by subtracting the trace element abun- The sheer number and variety of rock and mineral samples required for the production of the units is immense. More than 60 samples representing 25 different types of metallic and industrial minerals, aggregates and the three main rock groups igneous, sedimentary and
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We have measured the contamination of samples of granite, quartz porphyry, greenstone and dolerite after grinding them in steel and cemented carbide grinding mills. The steel mill contaminated the granite with Fe. The cemented carbide mill contaminated all samples with W and Co, and the granite and quartz porphyry with Ta. Contamination during grinding is proportional to the free quartz ... STAINMASTER Cornerstone Hope-mills Place River Rocks Textured Carpet Sample (Interior) Item 932913 Model CCV07-L012-0808 Designed to be softer, cleaner, and longer lasting
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