What is Dawsonite?
Dawsonite is a sodium aluminium carbonate hydroxide that forms pale fibrous and radiating aggregates in alkaline and carbon-rich environments.
Mineralogy and structure
The reference formula is NaAlCO3(OH)2. Dawsonite is orthorhombic and commonly occurs as delicate white sprays or crusts. Its formation can record alkaline fluids and carbon dioxide-rich alteration.
Colour and appearance
Typical colours include white, colourless, yellow, pink. Its fibrous, radiating, botryoidal habit and vitreous, pearly lustre are useful descriptive features, but colour alone is not diagnostic.
Formation and localities
Dawsonite forms in or is associated with alkaline igneous rocks, carbonatites and low-temperature cavities in sedimentary basins. Important documented localities include Canada, Greenland, Russia, Italy, the United States and Brazil.
Collecting and care
Dawsonite is best kept as a labelled reference or collector specimen. Protect fragile crystals from impact and avoid cutting or grinding unknown material. Lead-, arsenic-, vanadium- and copper-bearing specimens are for display and careful handling only.
Dawsonite in popular symbolism
Some modern crystal guides associate Dawsonite with zodiac signs or symbolic themes based on colour, locality or collecting tradition. These associations vary between sources and are cultural interpretations, not mineralogical or medical properties.
