Quartzite

Quartzite from Pakistan

Quartzite is a metamorphosed sandstone composed almost entirely of quartz grains that have recrystallized under high heat and pressure to form an interlocking mosaic of quartz crystals. This geological process imparts quartzite with exceptional hardness, strength, density, and resistance to chemical and physical weathering. Pakistan’s extensive metamorphic rock formations host several high-purity quartzite deposits suitable for refractory, metallurgical and construction applications.

Typical Composition

• SiO₂: 95-99%

• Fe₂O₃: 0.1-1.5%

• Al₂O₃: 0.2-2%

• CaO + MgO: < 1%

• Na₂O + K₂O: < 0.5%

• LOI: < 0.5%

Available Forms

• Raw blocks and boulders

• Crushed lumps (50-150 mm)

• Coarse aggregates (4.75-40 mm)

• Fine aggregates (0-4.75 mm)

• Milled fines (0-1 mm)

Key Properties

• Bulk Density: 2.5-2.7 g/cm³

• Specific Gravity: 2.6-2.8

• Hardness (Mohs): 7-8

• Compressive Strength: 200-300 MPa

• Thermal Expansion: 7-13 x 10⁻⁶/°C

• Thermal Conductivity: 5-6 W/mK

• Melting Point: 1670-1700 °C

• Chemical Resistance: High

Applications

High-silica refractory bricks and shapes, silica brick, ferrosilicon production, silicon metal production, foundry sand, metallurgical flux, abrasives, railroad ballast, concrete aggregates, road base material, erosion control riprap, dimension stone, landscaping stone.

Quality Assurance

Quartzite is tested as per relevant ASTM, BS and ISO standards for silica content, chemical composition, strength, thermal properties and size gradation. Each lot includes a Certificate of Analysis and technical datasheets. Independent lab testing and on-site inspection can be arranged on request.