Mineral Guide · Mineral

Cancrinite

Cancrinite is a feldspathoid silicate with a porous framework, often recognised by yellow to orange colour and occurrence in alkaline igneous rocks.

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Crystal structure

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Mineral properties

Formula: Na₆Ca₂Al₆Si₆O₂₄(CO₃)₂·2H₂O
Class: Silicates
Crystal system: Hexagonal
Typical colours: yellow, white, pink, orange, blue
Lustre: Greasy, Vitreous
Hardness: 5.00-6.00
Specific gravity: 2.42-2.50
Crystal habit: Granular, Massive, Prismatic
Origin: alkaline nepheline syenites, metasomatic rocks and carbonate-rich zones where feldspathoids are altered

What is Cancrinite?

Cancrinite is a feldspathoid silicate with a porous framework, often recognised by yellow to orange colour and occurrence in alkaline igneous rocks.

Mineralogy and structure

The reference formula is Na₆Ca₂Al₆Si₆O₂₄(CO₃)₂·₂H₂O. Cancrinite belongs to the silicates and has a hexagonal crystal system. Cancrinite is hexagonal and belongs to a group of open-framework feldspathoids. Carbonate and sulfate anions occupy channels in the structure, explaining its chemical variability.

Colour and appearance

Typical colours include yellow, orange, pink, white, blue. Crystal habit, lustre, transparency and matrix association are often as diagnostic as colour.

Formation and localities

Cancrinite forms in or is associated with alkaline nepheline syenites, metasomatic rocks and carbonate-rich zones where feldspathoids are altered. Important documented localities include the Kola Peninsula, Canada, Norway, Italy and alkaline complexes in the United States.

Collecting and care

Cancrinite is best kept as a labelled collector or reference specimen. Protect fragile crystals from impact and prolonged humidity changes. Lead-, arsenic-, chromium- and cobalt-bearing minerals should not be cut, ground or used in jewellery.

Sources and editorial review

Reviewed by NotOnlyRocks Editorial Team

Last reviewed: 31 August 2026

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