Magnesite
Natural Strength. Thermal Stability
Didwaniya Group supplies premium magnesite (MgCO₃) sourced and processed to meet industrial specifications. Our magnesite offers consistent composition and physical quality for refractory, chemical, agricultural and construction applications — delivered with global logistics and quality assurance.
Magnesite (chemical formula MgCO₃) is a naturally occurring magnesium carbonate mineral commonly found in vein deposits, hydrothermal veins and altered ultramafic rocks. It typically appears white to pale gray (sometimes pinkish or brown when iron-bearing) and forms in massive, crystalline, or earthy habits. Magnesite is valued for its capacity, when calcined, to produce magnesia (MgO) — a key raw material for refractories, chemicals and metallurgy. Its thermal decomposition characteristics make it an essential input where high-temperature stability is required.
Commercial magnesite is produced and supplied in several physical forms — lump ore, crushed aggregates and finely ground powder — each tailored to specific downstream needs. Didwaniya Group ensures strict sampling, beneficiation (if required), and size classification to deliver consistent particle size distribution, low contamination, and reliable chemical composition for industrial users across steel, cement, refractory brick manufacturers, fertilizer producers and chemical processors.
Characteristics
Chemical formula: MgCO₃
Molecular weight: 84.313 g·mol⁻¹ (typical)
Appearance (structure): Massive to crystalline; white to pale grey, may show tints from impurities
Texture / Particle size: Supplied as lumps, crushed fractions, or fine powders — particle size per buyer specification
Color: White to light gray (occasionally pinkish or buff with iron)
Specific gravity (approx.): ~2.9 – 3.0 (varies with porosity and impurities)
Mohs hardness: ~3.5 – 4.5 (varies by specimen)
Solubility: Insoluble in water; decomposes on strong acids and on heating to form MgO and CO₂
Typical purity (MgCO₃ basis): commercial grades vary — supplied grade and assay to buyer requirements (please request certificate of analysis)
Mass fraction of moisture, %, not more than (typical): 2.0%
Impurities: Fe, Ca, SiO₂ and other gangue minerals possible — levels controlled and reported in assay
Application
Magnesite’s major applications include production of dead-burned and caustic magnesia (for high-grade refractories), feedstock for magnesium compounds (e.g., magnesium oxide, hydroxide), agricultural lime and soil magnesium supplements, filler and functional additive in ceramics and glass, and use in construction materials. It is also employed in environmental and chemical industries (neutralizers, wastewater treatment), and as an insulating/heat-resistant component in specialized industrial linings and kiln furniture.
Storage Condition
Store magnesite in dry, clean, well-ventilated warehouses or covered storage to prevent moisture uptake and contamination. For powdered or milled magnesite, maintain low relative humidity (ideally <65%) and protect from direct water exposure; use sealed bags or silos for long-term storage. For lump or crushed magnesite, stack on clean platforms and cover with tarpaulins to keep material dry and accessible for inspection.