Iron stains, unstable batches and high melting costsslow the glass industry down. Anorthosite from Gudvangen gives manufacturers a cleaner, more stable melt — reducing energy, improving clarity and delivering a lower-carbon glass.
GLASS
Greater Clarity and Strength
High alumina and low iron after magnetic separation (< 0.7 %) give bright, durable glass with excellent chemical resistance and optical quality.
GLASS
Lower Energy Use
Balanced silica, calcium and alumina composition melts up to 50 °C faster, cutting fuel and CO₂ while extending furnace life.
GLASS
Consistent Batches
Controlled sodium-sulphate and alkali levels create predictable viscosity and fewer surface defects across float, container and fibre glass.
GLASS
Reliable European Source
Underground mining at Gudvangen provides around 500 000 t per year, shipped directly from the fjord — short routes, low emissions and steady supply for decades ahead.
Property | Anorthosite (Gudvangen) | Feldspar | Nepheline Syenite |
|---|---|---|---|
Fe₂O₃ | < 0.7 %* | 0.5 – 1.5 % | 0.5 – 1 % |
Al₂O₃ | 28 – 32 % | 17 – 20 % | 20 – 23 % |
CaO | 16 – 18 % | 0 – 2 % | 1 – 2 % |
Melting Temperature | Lower (≈ –50 °C) | Higher | Higher |
Energy Use | Reduced | Standard | Standard |
Colour / Clarity | Clear, bright | Light tint | Slight tint |
* After on-site magnetic separation.
FEATURES
Where Clarity Begins.
The performance of every furnace starts with the feed. Gudvangen anorthosite provides the balance that keeps glass pure, clear and consistent.
Typical composition : SiO₂ 45–48 %, Al₂O₃ 28–32 %, CaO 16–18 %, Fe₂O₃ < 0.7 % after magnetic separation, Na₂O + K₂O < 2 %. This chemistry forms a strong, stable glass network with minimal impurities.
Advanced processing controls iron and sodium-sulphate levels, producing a clean and uniform raw material optimised for industrial melting.
Pilot melts show clear, bright and chemically stable glass. Industrial-scale validation is ongoing with European partners.
Produced with renewable hydropower and shipped directly from Gudvangen, anorthosite supports energy-efficient, lower-emission production.
Produced in controlled fractions — from ultra-fine powders to coarse aggregates — ensuring consistent quality and predictable performance for every industrial process.
The Gudvangen site connects directly to deep-water shipping routes, providing efficient, low-emission bulk transport to industry across Europe.
Get in Touch
Working Together for Clearer Results
Discover how stable chemistry and lower energy use can improve your glass production.
