Talc (Hydrous magnesium silicate)


Talc is known for being the softest mineral on earth. It is number 1 on the Mohs hardness scale, and can be easily scratched by a fingernail. Talc is not commonly seen in collections, as it is usually uninteresting and fairly common, although a few deeply colored and crystallized examples are known and well sought after. Also very popular are the Talc pseudo-morphs. Talc forms some very interesting pseudo-morphs after many different minerals, and certain localities are known for the specific minerals replaced by Talc.

Talc mineral occurs naturally all around the world. It has a platy structure. Talc is a metamorphic mineral resulting from the metamorphism of magnesium minerals such as serpentine, pyroxene, amphibole, olivine, in the presence of carbon dioxide and water. This is known as talc carbonation or steatization and produces a suite of rocks known as talc carbonates.

Forming of Talc:

  1. Talc is primarily formed via hydration and carbonation of serpentine, as following reaction;
    Serpentine + Carbon dioxide = Talc + Magnesite + Water
    Mg3Si2O5 (OH) 4 + 3CO2 = Mg3Si4O10 (OH) 2 + 3 MgCO3 + 3 H2O
  2. Talc can also be formed via a reaction between dolomite and silica, which is typical of scarification of dolomites with silica-flooding in presence of metamorphic aureoles, i.e.

Dolomite + Silica + Water = Talc + Calcite + Carbon dioxide
CaMg (CO3) 2 + 4 SiO2 + H2O = Mg3Si4O10 (OH) 2 + 3 CaCO3 + 3 CO2 

PreRish Tri Exim Pvt. Limited (PEPL) offers highly versatile range of Talc mineral powder which is used in various industries especially in cosmetic. We use best quality machines to ensure the quality. PEPL have carved a niche as one of the leading Talc Producers in India.



Hydrous magnesium silicate, (Mg3H2(SiO3)4), talc powder, cosmetic talc, french talc, montana talc, texas talc, vermont talc, industrial talc, tremolitic talc, steatite talc, fibrous non-tremolite talc, no asbestos talc, magnesium silicate talc, talcum, french chalk, soapstone, steatite, CAS# 14807-96-6,

Chemical Properties:

  • Silicon dioxide = 56.3% (magnesium ore)
  • Finely ground grades oxide= 30.7% calcium oxide= 7.0%


Physical Properties:

  1. Ceramic grade (Coarse, medium & fine)
  2. Cosmetic grade
  3. Paint grades
  4. USP grade
  5. Soapstone grade
  6. Micronized grade
  7. Finely ground grade

Targets, tablets, pieces, granules and various powder granulations sized between 37 microns to 1.5 microns mean particle size.

Typical Applications:

  1. Lubricant, filler, reinforcement, electric and heat insulator, anti stick, anti cake, carrier, thickener, adsorbent, strengthener, ceramics, cosmetics, and pharmaceuticals.
  2. Ground talc makes talcum powder. The massive variety (soapstone) is used for sinks, table tops, etc. Soapstone found a use in Babylonian days when signature cylinder seals were often carved from it.
  3. The Egyptians also used it as a base for some of their blue faience figurines, which were then fired to fuse the glaze. California Indians also used it as sculpture material.


Hegman Grind                       =          3- 6
Density (g/cm3)                     =          2.7- 2.85
Specific Gravity                      =          2.6- 2.85
Oil Absorption                        =          30-55
RI Values na                             =        1.538 – 1.550 nß=1.575 – 1.594 n?=1.575 – 1.600
Appearance                            =          Translucent, Colorless, White, Pale green, Brown
Surface Area                            =        (m2/g) 4.3
Fracture                                 =          Sub-Conchoidal
Mohs Hardness                      =          @20°C 1.0- 1.5
pH                                           =          8.4-9.4
Crystallography                      =          Lamellar / Triclinic
G.E. Brightness                       =          85- 93
Refractive Index                     =          1.59- 1.60