(redirected from talcum powder)
Also found in: Dictionary, Thesaurus, Medical, Wikipedia.
Related to talcum powder: Gold bond


mineral ranging in color from white through various shades of gray and green to the red and brown of impure specimens, translucent to opaque, and having a greasy, soapy feel. It is a hydrous silicate of magnesium, Mg3Si4O10(OH)2, and usually contains small quantities of nickel, iron, and aluminum as impurities. It occurs commonly in folia (thin layers), but is also found in coarsely granular, finely granular, or cryptocrystalline masses. Soapstonesoapstone
or steatite
, metamorphic rock of which the characteristic and usually chief mineral is talc, but which also contains varying parts of chlorite, mica, tremolite, quartz, magnetite, and iron compounds.
..... Click the link for more information.
, or steatite, is a massive, granular form of talc. French chalk is a fine-grained variety. Talc is usually associated with chlorite schists, serpentine, dolomite, and other metamorphic rocks; it is apparently a secondary mineral formed by the alteration of other magnesium silicates. There are important deposits of talc in Austria, Italy, France, and Canada and in the United States in California, North Carolina, Texas, Georgia, and Montana. Talc is used in making paper (as a filler), paints, face and talcum powder, soap, fireproof roofing, foundry facings, lubricants, linoleum and oilcloth, electrical insulation, and pottery.



a widespread mineral of the class of phyllosilicates, with the formula Mg3 [Si4O10](OH)2. The magnesium may be replaced by Fe, Ni, Al, or Cr. Varieties of talc include minnesotaite, which contains Fe (50–80 atomic percent), willemseite, which is essentially nickeliferous talc, and steatite, or soapstone, which is compact massive talc.

The crystal structure of talc is a superposition of layers about 9 angstroms thick, consisting of two silicon oxide layers with Mg and OH ions between them. The charges of the atoms in the layers are balanced, and the layers are held together only by weak van der Waals’ bonds. The symmetry of the unit cell is triclinic, but any relative displacement of the layers causes a transition to a less ordered, monoclinic structure. Talc forms foliated or compact fine-grained masses and, less frequently, irregular lamellar crystals, up to 10 cm in size, which readily break into flexible transparent lamellae along cleavage planes.

Talc may be white or various shades of green. It is soft, with a hardness of 1 on Mohs’ scale, and has a greasy feel. Its density is 2,776–2,824 kg/m3; minnesotaite has a density of 3,010 kg/m3. Although talc is formed mainly at great depths under high temperatures and pressures, crystallization is possible at the earth’s surface in a strongly alkaline medium. Commercial deposits of talc are genetically associated with ultrabasic rocks or with magnesium-carbonate rocks, such as dolomite and magnesite. Talc occurs in talcose rocks, with admixtures of carbonates or chlorite, which are formed during normal metamorphism of magnesium silicate rocks, and as the more valuable pure talcites, formed by hydrometamorphic reactions involving contact between magnesium and siliceous rocks, such as gneisses, slates, or quartzites.

In the USSR, talc is obtained from the Shabrovskii talc-magnesite and the Miass talcite deposits in the Central Urals and from the Onot steatite talc deposit in the Vostochnyi Saian. A western Baikal talc-bearing region has been discovered. Abroad, major deposits of talc exist in Canada (Madoc), the USA (Gouverneur), and France (Luzenac).

Talc is used as an extender in the rubber, paper, and paint and varnish industries. It is also used in medicine and in the perfume and cosmetics industries; in technology it is used as a solid lubricant. An important application of talc is in ceramics, especially ceramic products used in radio insulation. Nonferrous steatite talc is an ornamental stone.


Mestorozhdeniia tal’ka SSSR. Moscow, 1973.
Inhalation of talc dust may lead to talcosis, an illness of the pneumonoconiosis group. Talcosis is observed in workers in the talc extraction and processing industries, as well as in the perfume and rubber industries. As a rule, it is a benign, slowly progressing illness, which has little effect on general health and work capacity. The most important means for its prevention are mechanization and automation of labor, dust suppression, dust collection, and the use of respirators.


Borshchevskii, Iu. M., V. G. Artamonova, and V. M. Retnev. Silikatozy i gigiena iruda. Leningrad, 1974.


Mg3Si4O10(OH)2 A whitish, greenish, or grayish hydrated magnesium silicate mineral crystallizing in the monoclinic system; it is extremely soft (hardness is 1 on Mohs scale) and has a characteristic soapy or greasy feel.


A soft mineral composed of hydrous magnesium silicate; a major ingredient of soapstone; used on roll roofing to prevent sticking in the roll.


a white, grey, brown, or pale green mineral, found in metamorphic rocks. It is used in the manufacture of talcum powder and electrical insulators. Composition: hydrated magnesium silicate. Formula: Mg3Si4O10(OH)2. Crystal structure: monoclinic
References in periodicals archive ?
Crown Shaving Company's Men's Body Talcum Powder is now available online at crownshavingco.
TORONTO, May 13, 2015 /PRNewswire/ -- Adding to its collection of premium grooming aids for men, Crown Shaving Company is launching a new body talcum powder, designed specifically to meet the needs of its masculine clientele, based on decades of experience serving customers in its old-world style barbershop.
Anyone can participate by picking up an empty box from The Diplomat Radisson Blu Hotel, Bahrain or any DHL outlet, filling it with the following items: a T-shirt, cap, disposable razor, shaving cream, deodorant, toothbrush, toothpaste, hand towel, comb, antibacterial soap, shampoo, talcum powder (all listed on the box itself), and returning it to the hotel or DHL.
Talcum powder topped the poll of baby products used by adults, followed by baby oil and baby shampoo.
It would of course be led by Dai Fawkes and could have the original title of The Talcum Powder Plot.
ANY sticky residue left by an adhesive label can be removed by covering the area with talcum powder then wiping with a dry cloth or using a little nail varnish remover on a piece of cotton wool.
The Malay Mail reported that an officer became suspicious when he checked a bag the woman was carrying that was packed with food containers plus a talcum powder container.
Shocked looking residents are cleaned up at Dudley Zoological Gardens KEEPERS at a Midlands zoo doused their lemurs in talcum powder in a fragrant bid to end a feud among the community.
KEEPERS at a Midland zoo doused their lemurs in talcum powder in a fragrant bid to end a feud among the community.
The first I stole off my cousin, which involves putting talcum powder at the bottom of the chimney, with imprints of Father Christmas' feet in them.
The man said: "She found a white powder not unlike talcum powder inside a printer.
1928: The first Avonbranded products - a toothbrush, talcum powder and a vanity set - are sold.