La description
~Talc is hydrated magnesium silicate. It generally occurs in two
morphologies, either macro- or microcrystalline. Variety and
complexity are known as the characteristics of talc, no two talc
being exactly the same. Thus the term talc covers a wide range of
natural rocks and minerals that slightly differ in morphology,
purity and properties. In nature pure talc is rare. Usually in the
orebody associate minerals are found, mostly chlorite, dolomite and
magnesite, and occasionally a certain portion of tremolite or
quartz is contained. By-minerals determine the nature of industrial
products and the talcs functions and applications.~Talc is termed
in chemistry hydrated magnesium silicate with the chemical formula
3MgO•4SiO2•H2O[Mg3Si4O*0（OH）2],Theoretically the pure talc is
*3.*7 percent SiO2, *1.*8 percent MgO, and 4.*5 percent H2O and its
crystal structure is platy, leafy, acicular or bulky. Pure talc
sheet is composed of a layer of magnesium-oxygen/hydroxyl
octahedra, sandwiched between two layers of silicon-oxygen
tetrahedral, the three being superimposed and interlinked by weak
van der Waals forces. The main or basal surfaces of this elementary
sheet do not contain hydroxyl groups or active ions, which explains
talc's hydrophobicity and inertness.
 Talc is neither conductive nor flammable and practically
insoluble in water, weak acids or alkalis. Although it has very
little chemical reactivity, talc does have a marked affinity for
certain organic chemicals, i.e. it is organophilic and hydrophobic.
The melting point if talc is at ***7°C. Between **0 to **0°C, it
loses its hydroxyl groups (structural water) progressively.
   The crystal habit of talc is commonly foliated
to fibrous masses, with a Mohs scale of hardness of 1 and density
of 2.*5, having a distinctly greasy feel and its color ranges from
white to grey or green.
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