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Granite is a natural source of radiation, like most natural stones. Potassium-40 is a radioactive isotope of weak emission, and a constituent of alkali feldspar, which in turn is a common component of granitic rocks, more abundant in alkali feldspar granite and syenites. Some granites contain around 10 to 20 parts per million (ppm) of uranium.
Engineered stone. Engineered stone is a composite material made of crushed stone bound together by an adhesive to create a solid surface. The adhesive is most commonly polymer resin, with some newer versions using cement mix. This category includes engineered quartz (SiO 2), polymer concrete and engineered marble stone. [1]
Countertops are custom made and more scratch resistant as well as less porous than natural quartz surfaces, and don't need to be sealed like other stone surfaces. Due to the presence of the resins, quartz counters are less prone to staining. Thicknesses may be 6mm, 1.2 cm (1/2 inch), 2 cm (3/4 inch), 3 cm (1¼ inch) or 4 cm (1½ inch).
The look of any quartz countertop compares to granite in that the colors are deep and consistent. [5] The process of creating the countertops is different than granite, in that it is an engineered product, consisting of a minimum of 93% quartz and 7% epoxy binder and dyes. [6]
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Wildfires in California and Nevada have spread rapidly after a heat wave that saw triple-digit temperatures and dry conditions — but cooler weather may bring some respite in the firefights.
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