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Tests also have shown that this countertop surface is the most resistant to discoloration from foods and household products among common household surfaces, the second most stain resistant being granite. [3] Countertops are custom made and more scratch resistant as well as less porous than natural quartz surfaces, and don't need to be sealed ...
Formica kitchen countertop Formica laminate was invented in 1912 by Daniel J. O'Conor and Herbert A. Faber, while they were working at Westinghouse , resulting in a patent filing on 1 February 1913. [ 1 ] [ 2 ] U.S. Patent No. 1,284,432 was granted on 12 November 1918. [ 3 ]
Exfoliating slabs of granite, on Half Dome in Yosemite National Park, USA. Exfoliating granite is a granite undergoing exfoliation, or onion skin weathering (desquamation).The external delaminated layers of granite are gradually produced by the cyclic variations of temperature at the surface of the rock in a process also called spalling.
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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.
Mica; General; Category: Phyllosilicates: Formula (repeating unit) AB 2–3 (X, Si) 4 O 10 (O, F, OH) 2: IMA symbol: Mca [1]: Identification; Color: purple, rosy ...