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Clay is a very common substance. Shale, formed largely from clay, is the most common sedimentary rock. [11] Although many naturally occurring deposits include both silts and clay, clays are distinguished from other fine-grained soils by differences in size and mineralogy.
Roses and seashells made of Paperclay (DECO) Industrial clay: a clay model of a BMW Modelling clay or modelling compound is any of a group of malleable substances used in building and sculpting. The material compositions and production processes vary considerably.
Pewter (/ ˈ p juː t ər /) is a malleable metal alloy consisting of tin (85–99%), antimony (approximately 5–10%), copper (2%), bismuth, and sometimes silver. [1] In the past, it was an alloy of tin and lead, but most modern pewter, in order to prevent lead poisoning, is not made with lead.
Hexagonal sheets of the clay mineral kaolinite (SEM image, 1,340× magnification). Clay is a very fine-grained geologic material that develops plasticity when wet, but becomes hard, brittle and non–plastic upon drying or firing.
Bismuth is an ingredient in some pharmaceuticals, [9] although the use of some of these substances is declining. [ 56 ] Bismuth subsalicylate is used to treat diarrhea ; [ 9 ] it is the active ingredient in such "pink bismuth" preparations as Pepto-Bismol , as well as the 2004 reformulation of Kaopectate .
Natural bronze, a type of copper made from ores rich in silicon, arsenic, and (rarely) tin, came into general use in the Balkans around 5500 BC. [106] Alloying copper with tin to make bronze was first practiced about 4000 years after the discovery of copper smelting, and about 2000 years after "natural bronze" had come into general use. [ 107 ]
Cigarette smoke contains, among other toxic substances, radioactive lead-210. [282] "As a result of EPA's regulatory efforts, levels of lead in the air [in the United States] decreased by 86 percent between 2010 and 2020." [283] The concentration of lead in the air in the United States fell below the national standard of 0.15 μg/m 3 [284] in ...
A metal (from Ancient Greek μέταλλον (métallon) 'mine, quarry, metal') is a material that, when polished or fractured, shows a lustrous appearance, and conducts electricity and heat relatively well.