Talc
facebook 
google plus
twitter 
instagram 

Talc

MGT Mineral Company as a major producer, supplier and exporter of several minerals and materials in The Middle East, is located in Iran. MGT Mineral Company has a lot of experience in exporting and is active in case of Talc supplying. 

Talc is an abundant silicate mineral (Mg3Si4O10(OH)2) that is distinguished from other minerals by its considerable softness (it has the lowest rank on the Mohs scale). Compact aggregates of high-purity Talc is called Steatite.

 Iran Talc exporter, talc supplier, iran talc, talc, talc exporter

Iran is a major Talc producer in the Middle East. MGT Mineral Company can provide all necessary conditions for Talc exporting. It is MGT Mineral Company's honor to have great commercial relationships with the most of Iranian Talc producers.

 

 

Physical Properties of Talc
Chemical Formula Mg3Si4O10(OH)2
Cleavage {001} Perfect
System Triclinic
Color Pale green, White, Gray white, Yellowish white, Brownish white.
Density 2.7 - 2.8 g/cm3
Diaphaneity (Transparency) Translucent
Fracture Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Tenacity Sectile
Habit Foliated - Two dimensional platy forms; Massive - Uniformly indistinguishable crystals forming large masses; Scaly - Morphology like fish scales.
Hardness (Mohs) 1 - Talc
Luminescence Fluorescent, Short UV=orange yellow, Long UV=yellow.
Luster Vitreous - Pearly
Streak white
Magnetism Nonmagnetic
Geological Setting Schists and steatite through hydrothermal alteration of mafic rocks. Low temperature metamorphism of siliceous dolomites.

Talc occurrence

Talc is a hydrothermal and metamorphic mineral which is found typically in the green schist facies of metamorphic rocks, and also in shear zones where it is an alteration area. Talc has recently been found to be widespread in limestones of many formations that is ranging in age from Devonian till Recent. Where present, it is almost invariably accompanied by chlorite; other clay minerals might be present. The occurrence of Talc has also been noted in shales and sandstones, but in these rocks it is extremely unusual.

Most Talc originates in one of two different ways: (1) metasomatic replacement of dolomite or, less commonly, other sedimentary rocks, by Talc, and (2) alteration of ultramafic rocks, generally first to serpentinite and later to Talc. Deposits of each type are found in both the eastern and western United States. 

Deposits in sedimentary rocks: Formation of Talc from Carbonate and other sedimentary rocks results from interaction with hydrothermal solutions. The silica required to convert Carbonate rocks to Talc is most likely derived from adjacent siliceous rocks, though some may originate from an intrusive magma. In exchange, Carbonate rocks may supply magnesium to convert siliceous rocks. Plutonic rocks which may have served as sources for heat or hydrothermal solutions are present near some deposits, but absent near others. This type of deposit is found in a very wide range of geologic environments. 

 

Iran Talc producer

 

Deposits in ultramafic rocks: The formation of Talc by the alteration of ultramafic rocks is generally preceded by the conversion of the original rocks to serpentinite.

Because forsterite has a higher Mg/Si ratio than serpentine and ortho- and clino-pyroxenes have a lower ratio, serpentinization can be accomplished by the addition of water without addition or subtraction of either SiO2 or MgO. Fe in the original olivine and pyroxene goes into Fe oxides, most commonly magnetite. Serpentinization may take place at various stages during the history of an ultramafic body. In general, small- to medium sized bodies such as those in fault or melange zones have been completely converted to serpentinite, whereas peridotite or dunite cores remain in larger bodies. Very large, sheet-like bodies, such as the Trinity and Josephine ophiolites in the Klamath Mountains, commonly are serpentinized only near their margins.

 

Economic Classification

Talc is categorized to three types by its chemical analysis as follows:

Chemical Analysis of different types of Talc
Type I II III
SiO2 60.06 % 62.16 % 63.37 %
Al2O3 1.60 % 0.88 % -
FeO 1.74 % 1.41 % -
MgO 30.83 % 30.86 % 31.88 %
CaO 0.4 % - -
H2O 5.02 % 4.92 % 4.75 %

Talc Usages:

Talc has five special characteristics that make it a precious mineral for domestic and industrial applications.

  • Softness
  • Chemical inertness
  • Lamellarity
  • Whiteness
  • Affinity for Organic Chemicals

In fact, Talc is found in everything from tires to animal feed. Since 15,000 years ago, cave dwellers used Talc in their paints. For at least 5,000 years, it has been used in cosmetics, especially as a skin lightener, and 1,000 years ago, the Chinese began using it in their glazed pottery. Listed below are several of Talc’s uses for the industries of the world:

  • Talc is a useful and versatile mineral. Industries using major quantities for their products include ceramics, paint, paper, plastics, and roofing. Smaller quantities go into textiles, rubber, lubricants, cosmetics, and other uses.
  • In ceramics, Talc imparts low, uniform, shrinkage upon firing and high strength to the product, especially valuable for bathroom fixtures, wall and floor tile, pottery, and dinnerware. Mixtures for these purposes may contain 40-70% talc, the remainder being mostly clay. Other, more specialized, ceramic uses include electrical insulators, commonly containing 85% Talc 

  • Talc is used as an extender and filler in paint, providing whiteness, oil absorption, chemical inertness and viscosity. Talc reinforces paint films, prevents sagging, and improves suspension in the can, dispersing readily in both aqueous and solvent-based paints. Because of the softness of the mineral, abrasion of application equipment is minimal.

  • As a filler in paper, Talc has minimal negative effect on strength but improves ink receptivity. It enhances opacity, whiteness, and brightness, providing these properties with lower density, and lower cost, than TiO2. Another important function of Talc in paper is the absorption of pitch originating in the pulp, which would otherwise tend to deposit at various places in the paper-making machinery. Ultra-fine Talc is also used as a Pigment for color-coating high-quality paper.

  • Talc is a useful filler in plastics. It is used mostly in polypropylene, but also in vinyl, polyethylene, nylon and polyester. Because of its platy particle shape, Talc increases the stiffness of polypropylene; it also increases the heat resistance and reduces shrinkage. Talc is less abrasive than competing fillers.

  • In roofing materials, Talc is used as a filler to help stabilize the melted asphaltic components. It increases the weather resistance of the finished product. When sprinkled on the surface, it prevents sticking in either shingles or roll roofing.

  • Talc is also used as a sizing in textiles, and in foam-rubber backing for carpets. It is an additive in lubricants needed to operate under extreme temperature ranges. It is used as an anti-stick dusting compound for rubber goods, and as an insecticide carrier.

  • Cosmetic and pharmaceutical uses consume small quantities of the highest purity talc. It is used in face and body powders, antiperspirants, and lotions. It is also an inert carrier in medicine tablets. 

  • Talc, commonly in impure soapstone form, has been a useful dimension stone from the earliest stages of the industry, products include hearthstones, furnace linings, wood stoves, sinks, washboards, and carved figurines and statuary.

S5 Box