Talc is a naturally occurring mineral primarily composed of magnesium, silicon, oxygen, and hydrogen. It originates from metamorphic rocks and forms mainly through the metamorphism of magnesian minerals like serpentine, pyroxene, amphibole, and olivine in the presence of carbon dioxide and water. Talc can also form from sedimentary processes involving hydrated magnesium- clay precursors. It is typically mined from open-pit mines where talc deposits are extracted as rock, then crushed and purified into a fine powder.

The major sources of talc today include countries like the United States, China, India, France, Italy, Canada, and Japan. The talc used in cosmetics and pharmaceuticals undergoes further purification to remove impurities and ensure safety.

In summary, talc comes from natural mineral deposits found in metamorphic rocks formed through geological processes, mined worldwide, and processed to produce the powder used in various industries such as cosmetics, pharmaceuticals, and manufacturing.