Overview

Feldspar is not a single mineral but a group of rock-forming aluminosilicate minerals containing varying amounts of potassium, sodium, or calcium. It is one of the most abundant mineral groups in the Earth's crust.

Main Types

• Potassium Feldspar
• Sodium Feldspar (Albite)
• Calcium Feldspar

Applications

• Glass manufacturing
• Ceramic tiles
• Sanitaryware
• Ceramic glazes
• Porcelain products
• Paints, plastics, and industrial fillers

How It Works

In Ceramics

Feldspar acts as a flux, lowering the melting temperature during firing and helping create a strong, smooth, glass-like finish.

In Glass Manufacturing

Feldspar improves hardness, durability, and resistance to chemical corrosion.

Typical Analysis

• Al₂O₃: 18–20%
• SiO₂: 65–70%
• K₂O + Na₂O: 10–12%
• Fe₂O₃: <0.2%