What is talc rock?
Talc is a common metamorphic mineral in metamorphic belts that contain ultramafic rocks, such as soapstone (a high-talc rock), and within whiteschist and blueschist metamorphic terranes.
How are talc rocks formed?
Talc is formed by the hydrothermal alteration of ultrabasic rocks, or low grade thermal metamorphism of siliceous dolomites. Most people know talc as the primary ingredient in talcum powder. Talc often replaces other minerals atom by atom to form pseudomorphs, taking the form of the replaced mineral.
What is characteristics of talc?
Talc is usually green, white, gray, brown, or colorless. It is a translucent mineral with a pearly luster. It is the softest known mineral and is assigned a hardness of 1 on the Mohs Hardness scale. Talc is a monoclinic mineral with a sheet structure similar to the micas.
What is talc made of?
What is talcum powder? Talcum powder is made from talc, a mineral made up mainly of the elements magnesium, silicon, and oxygen. As a powder, it absorbs moisture well and helps cut down on friction, making it useful for keeping skin dry and helping to prevent rashes.
What is the difference between talc and soapstone?
is that talc is a soft mineral, composed of hydrated magnesium silicate, that has a soapy feel and a greenish, whitish, or grayish color, and usually occurs in foliated masses while soapstone is (geology) a soft rock, rich in talc, also containing serpentine and either magnetite, dolomite or calcite.
What is the chemical name for talc?
hydrous magnesium silicate
Chemically, talc is a hydrous magnesium silicate with a chemical formula of Mg3Si4O10(OH)2. Talc has many uses in cosmetics and other personal care products.
Are there different types of talc?
Definition: Talc is defined as an hydrated magnesium sheet silicate with the chemical formula Mg3Si4O10(OH)2. They can be roughly divided into two deposit types: TALC-CARBONATE (dominantly talc with variable amounts of chlorite, dolomite and or magnesite) and TALC-CHLORITE (dominantly talc with chlorite).
What is the useful properties of talc?
High-quality (pure) talc has many physical and chemical properties favorable for its use, such as its softness, purity, fragrance retention, whiteness, luster, moisture content, oil and grease adsorption, chemical inertness, low electrical conductivity, high dielectric strength, and high thermal conductivity (Virta.
What is the density of talc?
2.76 gm/cc
Talc Mineral Data
| General Talc Information | |
|---|---|
| Chemical Formula: | Mg3Si4O10(OH)2 |
| Pleochroism (y): | pale green. |
| Calculated Properties of Talc | |
| Electron Density: | Bulk Density (Electron Density)=2.76 gm/cc note: Specific Gravity of Talc =2.75 gm/cc. |
How is talc mined?
Over 95 percent of the talc ore produced in the United States comes from open-pit mines. Mining operations usually consist of conventional drilling and blasting methods. Talc ore generally is hauled to the plant by truck from a nearby mine. The ore is crushed, typically in a jaw crusher, and screened.
What uses talc?
Talc is also used in lubricants, leather dressings, toilet and dusting powders, and certain marking pencils. It is used as a filler in ceramics, paint, paper, roofing materials, plastic, and rubber; as a carrier in insecticides; and as a mild abrasive in the polishing of cereal grains such as rice and corn.
How much is talc worth?
Unit values for cut or sawed talc ranged from $517 per ton to $1,241 per ton for shipments exceeding 100 tons. The average unit value for all shipments, including those of 100 tons or less, was $60 per ton for crude talc; $100 per ton for ground talc; and $997 per ton for cut or sawed talc.
How is talc classified as an industrial mineral?
Classified as talc in the industrial sense are materials that range in composition from virtually the pure mineral to gross admixtures of talc, carbonate, tremolite, serpentine, and other minerals. Deposits of industrial talc are associated principally with sedimentary rocks and with ultramafic and mafic igneous rocks.
Which is the most common parent rock for talc?
Carbonate rock, chiefly dolomite, is the most common parent rock of talc deposits associated with sedimentary rocks; serpentinite is the most common parent rock of deposits associated with ultramafic and mafic igneous rocks. The deposits show a wide range of genetic relations.
Where does the name talc come from and why?
The name talc is probably derived from the Arabic talk, for pure, most likely referring to talc’s white color [9]. A massive talcose rock, often with admixed serpentine and calcite, is called steatite, and an impure massive variety is known as soapstone.
What makes talc a sui generisraw material?
Talc is a sui generisraw material due to its properties which make its uses so diversified. It is widely used commercially because of its lamellar habit, softness, whiteness, fragrance retention, luster and chemical purity.