Geology Mont Saint-Hilaire

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carletonite crystal poudrette quarry, mont saint-hilaire, type locality.



catapleiite-analcime-aegirine


mont saint-hilaire 1 of monteregian hills, group of erosional remnants of intrusive mountains spreading across southern quebec. composed of 3 distinct plutonic intrusions formed during cretaceous period between 133 , 120 million years ago. other monteregian hills, mont saint-hilaire forms part of great meteor hotspot track, created when north american plate slid on new england hotspot. during time, melting occurred, creating subsurface magma intrusions. erosion of surrounding softer sedimentary rocks revealed more resistant rocks of mont saint-hilaire.


mineral wealth

mont saint-hilaire famous mineral locality because of great number of rare , exotic mineral species. annite (iron rich biotite) mont saint-hilaire among iron-rich found in nature. in gabbro, biotite less iron-rich, has lower manganese content, titanium-rich. phlogopite found small metamorphic crystals in marble xenoliths within syenite. siderophyllite, relatively rare mineral, occurs large crystals in metasomatised albite-rich albitite dike.


in addition gabbro, second intrusive suite included nepheline syenite, diorite , monzonite. third intrusive occupies eastern side , peralkaline nepheline syenites , porphyrites. mineralogically interesting associated agpaitic (alkali rich, low aluminium , silicon) pegmatites, intrusive breccias, , hornfels derived metasomatised sedimentary wall rocks. there have been on 366 distinct species of minerals collected @ mont saint-hilaire, 50 of have site type locality.








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