Knowra Talc Talc Talc is a hydrated magnesium silicate mineral with a layered crystal structure. It is the softest mineral on the Mohs hardness scale and commonly forms in metamorphic rocks.
Mohs scale of mineral hardness : A scale that ranks minerals by their resistance to scratching, from 1 for talc to 10 for diamond. Talc defines the scale’s lowest point because it is softer than every other mineral.
Metamorphism : The transformation of rocks through heat, pressure, and chemically active fluids without complete melting. Talc commonly forms when metamorphic conditions alter magnesium-rich rocks.
Talc powder : A finely ground form of talc used in personal-care products and industrial applications. Grinding the mineral creates the soft, slippery powder valued in many products.
Talc mining : The extraction of talc-bearing rock for mineral processing and commercial use. Mining supplies the mineral for powders, ceramics, paper, and other products.
Phyllosilicate : A class of silicate minerals built from sheets of linked tetrahedra. Talc belongs to this sheet-silicate class, whose structure helps explain its easy cleavage.
Serpentinization : The hydration and chemical alteration of ultramafic rocks, producing serpentine minerals and other phases. Serpentinite can react with silica-bearing fluids to form talc.
Paper production : The manufacture of paper from pulp through forming, pressing, and drying. Talc can act as a filler and pitch-control additive during papermaking.
Asbestos : A group of fibrous silicate minerals whose inhaled fibers can cause serious disease. Some talc deposits occur near asbestos, making geological separation and product testing consequential.
Silicate mineral : A mineral whose structure contains silicon–oxygen units, the most abundant mineral group in Earth’s crust. Talc’s magnesium and hydroxyl groups are arranged around a silicate framework.
Dolomite : A carbonate mineral composed of calcium magnesium carbonate, common in sedimentary and metamorphic rocks. Silica-bearing fluids can react with dolomite to produce talc and carbonate minerals.
Show all 24