Talc is the world’s softest mineral. Although all talc ores are soft, platy, water repellent and chemically inert, no two talcs are quite the same. Talc is a vital part of everyday life. The magazines we read, the polymers in our cars and houses, the paints we use and the tiles we walk on are just some of the products that talc enhances. Talc is a hydrated magnesium sheet silicate with the chemical formula Mg3 Si4 O10 (OH)2. The elementary sheet is composed of a layer of magnesium-oxygen/hydroxyl octahedra, sandwiched between two layers of silicon-oxygen tetrahedra. 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 practically insoluble in water and in weak acids and alkalis. It is neither explosive nor flammable. Although it has very little chemical reactivity, talc does have a marked
affinity for certain organic chemicals, i.e. it is organophilic. Above 900°C, talc progressively loses its hydroxyl groups and above 1050°C, it re-crystallises into different forms of
enstatite (anhydrous magnesium silicate). Talc’s melting point is at 1500°C. 

Morphology
The size of an individual talc platelet (= a few thousand elementary sheets) can vary from approximately 1 micron to over 100 microns depending on the deposit. It is this individual platelet size that determines a talc’s platyness or lamellarity. A  highly  lamellar  talc  has  large  individual platelets whereas a microcrystalline talc’s platelets are much smaller .
The  elementary  sheets  are stacked on top of one another, like flaky pastry, and, because the  binding  forces  (known  as Van der Waal’s forces) linking one  elementary  sheet  to  its
neighbours are very weak, the platelets slide apart at the slightest touch, giving talc its characteristic softness.

Related minerals
Talc  ores  also  differ  according  to  their  mineralogical composition (i.e. the type and proportion of associated minerals present). They can be divided into two main types of deposits: talc-chlorite and talc-carbonate. Talc-chlorite ore bodies consist mainly of talc (sometimes 100%) and chlorite, which is hydrated magnesium and aluminium silicate. Chlorite is lamellar, soft and organophilic like talc. It is however more hydrophylic. Talc-carbonate ore bodies are mainly composed of talc carbonate and traces of chlorite. Carbonate is typically magnesite (magnesium carbonate) or dolomite  (magnesium  and  calcium  carbonate).  Talc-carbonate  ores  are  processed  to  removed  associated minerals and to produce pure talc concentrate.