Colour shifts and wasted energy hold ceramic production back. Anorthosite from Gudvangen provides a clean,low-iron source that fires evenly and keeps colours bright.
CERAMICS
Brighter Colours
Low iron and titanium keep glazes and bodies clean, giving whiter tones and sharper colour response.
CERAMICS
Stable Firing
Balanced chemistry ensures even sintering and fewer deformations
— every batch fires predictably.
CERAMICS
Lower Energy Use
Anorthosite melts faster and fires cleaner, reducing kiln time and total fuel demand.
CERAMICS
Fewer Additives
Very low iron keeps the mix light and consistent — ideal for visible concrete and architectural surfaces.
Property / Parameter | Anorthosite (Gudvangen) | Feldspar | Kaolin (Clay) |
|---|---|---|---|
Main Function | Combined source of Al₂O₃, CaO, SiO₂ | Al₂O₃ + alkali flux | Plasticity and alumina source |
Melting Temperature | 1 350–1 400 °C | 1 400–1 450 °C | 1 600 °C+ |
Fe₂O₃ + TiO₂ Content | Very low (≈ 0.5 %)* | 1–2 % | 0.8–1.2 % |
Colour in Firing | Bright white | Slight tint | Cream to light brown |
Sintering Behaviour | Smooth and uniform | Stable | May shrink or warp |
Additives Required | Minimal | Needs Ca-source | Needs flux additives |
Energy Demand | ≈ 3–5 % lower | Baseline | Higher |
Environmental Impact | Low — electric mining, sea transport | Moderate — quarrying | Moderate — mining, drying |
* After on-site magnetic separation.
FEATURES
Natural Balance. Precise Firing.
From mineral balance to delivery route, every factor works together to make Gudvangen anorthosite a stronger, cleaner and more consistent foundation for concrete.
Gudvangen anorthosite contains 0.5 % Fe₂O₃ after magnetic separation and <0.3 % TiO₂. These low levels help maintain bright white bodies and reduce colour shifts during firing.
With around 50 % SiO₂, 30 % Al₂O₃ and 14 % CaO, the mineral provides a natural flux balance that supports smooth sintering and consistent shrinkage.
Composed of more than 90 % plagioclase feldspar with fine, even grain size. This uniformity gives predictable firing behaviour and a consistent surface finish.
The balanced composition enables earlier melting, which can reduce kiln energy demand and support longer lining lifetime.
Produced in controlled fractions, from ultra-fine powders to coarse aggregates, ensuring consistent quality and predictable performance for every industrial process.
Crushed and screened on-site and shipped directly from Gudvangen’s fjord terminal, reducing handling, contamination risk and emissions.
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From Raw to Refined
Partner with us to create cleaner, brighter ceramics with the purity of Gudvangen anorthosite.
