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Đất Sét Xanh French Green Clays
Xuất xứ: France
French green clay is a substance that is used for external cosmetic treatments as well as some internal applications by practitioners of alternative medicine. It was used in ancient Egypt, Greece, and Rome to treat a variety of skin problems and digestive disorders.
From the standpoint of mineralogy, French green clay belongs to a subcategory of clay minerals known as illite clays, the other two major groups being kaolinite and smectite clays. Clay minerals in general are important because they make up about 40 percent of such common rocks as shale, and they are the main components of soil. Illite clays are usually formed by weathering or by changes produced in aluminum-rich minerals by heat and acidic ground water. They often occur intermixed with kaolinite clays—which are typically used in the ceramics industry. Illite clays have been used successfully by environmental managers to remove such heavy metals as lead, cadmium, and chromium from industrial wastewater.
French green clay takes its name from the fact that rock quarries located in southern France enjoyed a virtual monopoly on its production until similar deposits of illite clays were identified in China, Montana, and Wyoming. The clay's green color comes from a combination of iron oxides and decomposed plant matter, mostly kelp seaweed and other algae. Grey-green clays are considered less valuable than those with a brighter color. The other components of French green clay include a mineral known as montmorillonite, as well asdolomite, magnesium, calcium, potassium, manganese, phosphorus, zinc , aluminum, silicon,copper, selenium , and cobalt.
French green clay is prepared for the commercial market by a process of sun-drying and crushing. After the clay has been mined, it is spread in the sun to remove excess water. It is then ground by large hydraulic crushers and micronized, or finely pulverized. The last stage in the process is a final period of sun-drying to remove the last traces of water. French green clay is available in a dry powdered form for a variety of uses as well as in premixed soaps, scrubs, facial powders, and masks for cosmetic purposes. Prices for an eight-ounce jar of powdered clay range between $4.50 and $11.00 in health food stores. Soaps made with French green clay are priced at about $4.50 a bar.
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