Sectile and it is very soft, with a hardness of 1 (Talc is the softest of hardness minerals Mohs’scale). It has a specific gravity of 2.5-2.8, a chandelier or dusty, and is translucent to opaque. Its color varies from white to gray or green and has a bold feel. Its sequence is white. Training Talc is a metamorphic mineral resulting from the metamorphism of magnesian minerals such as pyroxene, amphibole, olivine and other minerals in the presence of carbon dioxide and water.

This is known as talc carbonation or steatization and produces a series of rocks known as talc carbonates. Talc is primarily formed by the hydration and carbonation of serpentine, through the reaction; Serpentine + carbon dioxide? Talc + Magnesite + water talc may also be formed by a reaction between dolomite and silica, which is typical of dolomites skarnification via silica flooding in contact metamorphic aureoles; Dolomite + silica + water? Talc + calcite + carbon dioxide talc may also be formed from magnesian chlorite and quartz in eclogite and blueschist metamorphism through the metamorphic reaction:

Chlorite + quartz? Talc + kyanite + H2O

In this reaction, the ratio of talc and kyanite is dependent on the aluminum with aluminous rocks favoring the production of kyanite. This is typically associated with high pressure, low-temperature minerals such as phengite, garnet, glaucophane in the lower blueschist facies. These rocks are generally white, friable, and fibrous, and are known as whiteschist.Occurrence Talc is a very common metamorphic mineral in metamorphic belts that contain ultramafic rocks such as soapstone (talc a high-rock), and whiteschist and blueschist metamorphic terranes.
Whiteschists first example of the Franciscan metamorphic belt of the western United States, Western Europe, especially in the Alps, Italy, certain regions of the Musgrave Block, and some collisional orogens such as the Himalayas. Ultramafic talc gas are typical of many areas of the Archaean cratons, including komatiite belts of the Yilgarn Craton in Western Australia. Ultramafic talc-carbonate are known to the Lachlan Fold Belt, eastern Australia, Brazil, Guyana Shield, and the ophiolite belt of Turkey, Oman and the Middle East. Among the economic events include talc Mount Seabrook talc mine, Western Australia, comprising a polydeformed, layered ultramafic intrusion. Uses a large gray-green high-talc rock steatite or soapstone is and has been used for stoves, sinks, electrical distribution boards, etc.

Talc finds use as a cosmetic (talcum powder) as a lubricant and as an expense in the manufacture of paper. Talc is used in baby powder, an astringent powder used for preventing rashes on the area covered by a layer (see diaper rash). Most tailors chalk is talc, chalk is often used for welding or metalworking.Talc is also used as food additives or pharmaceuticals. In medicine is used talc as a pleurodesis to prevent recurrent pneumothorax. In the European Community is the number of the additive E553b.
Security

Several studies have established before the links between issues of talc and lungs, lung cancer, skin cancer and ovarian cancer. This is a major concern given the widespread commercial talc and households. However, no study has yet been made to determine the toxicity or the other and / or carcinogenic nature of talc and the long history of safe use suggests that these fears are unfounded. The U.S. Food and Drug Administration (FDA) estimates that non-asbestiform talc, the talc which does not contain potentially carcinogenic asbestiform amphibole fibers, which must be generally recognized as safe (GRAS) for use in cosmetics. In 1993, the U.S. National Toxicology Program report found that cosmetic grade talc tumors in animals has caused, even if it contained no asbestos-like fibers. Scientists became aware of the toxicity of talc since the late 1960s, and in 1971 researchers found particles of talc embedded in 75 percent of ovarian tumors studied.