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Dawsonite is a mineral composed of sodium aluminium carbonate hydroxide, chemical formula NaAlCO3(OH)2. It crystallizes in the
orthorhombic In crystallography, the orthorhombic crystal system is one of the 7 crystal systems. Orthorhombic lattices result from stretching a cubic lattice along two of its orthogonal pairs by two different factors, resulting in a rectangular prism with a r ...
crystal system. It is not mined for ore. It was discovered in 1874 during the construction of the Redpath Museum in a feldspathic dike on the campus of McGill University on the
Island of Montreal The Island of Montreal (french: Île de Montréal) is a large island in southwestern Quebec, Canada, that is the site of a number of municipalities including most of the city of Montreal and is the most populous island in Canada. It is the main ...
, Canada. It is named after geologist Sir John William Dawson (1820–1899). The type material is preserved in the collection of the Redpath Museum.


See also

* List of minerals * List of minerals named after people * Dihydroxialumini sodium carbonate, the commercial (artificial) form, used as an antacid


References

Sodium minerals Aluminium minerals Carbonate minerals Orthorhombic minerals Minerals in space group 74 Luminescent minerals {{carbonate-mineral-stub