The type occurrence was a trachytic (feldspathic)dike cutting Trenton limestone "near the western end of McGill College [now McGill University]." The type specimens were collected after 1855 and before 1874 when dawsonite was first described. What may have been the same dike was encountered in 1963 during construction of the Leacock Building on the McGill University campus.
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Map Reference: 45°30'15"N , 73°34'38"W
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Mineral List:6 entries listed. 5 valid minerals. 1 type locality (valid mineral).
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