Vote for your favorite mineral in #MinCup26! - Azurite vs. Smithsonite
It's carbonate-vs-carbonate to kick off Mineral Cup 2026 with copper-rich Azurite against zinc-rich Smithsonite.
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Magnesite from
Poudrette quarry (De-Mix quarry; Demix quarry; Uni-Mix quarry; Carrière Mont Saint-Hilaire; MSH), Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada


Locality type:Quarry
Classification
Species:Magnesite
Formula:MgCO3
Habit:transparent, modified rhombohedra
Colour:light greyish green
Confirmation
Validity:Believed Valid
Associated Minerals Based on Photo Data:
Anatase2
Data
Mineral Data:Click here to view Magnesite data
Locality Data:Click here to view Poudrette quarry (De-Mix quarry; Demix quarry; Uni-Mix quarry; Carrière Mont Saint-Hilaire; MSH), Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada
Photo GalleryView Gallery (5 photos)
Data Identifiers
Mindat Occurrence Record ID:7174
Long-form Identifier:1:3:7174:1
GUID (UUID V4):0
Nearest other occurrences of Magnesite
38.6km (24.0 miles) Canadian National Railway tunnel, Mont Royal, Montréal, Québec, Canada
73.9km (45.9 miles) Baker Talc mine (Van Reet mine), Bolton-Est, Memphrémagog RCM, Estrie, Québec, Canada
86.7km (53.8 miles) Sterrett mine, Saint-Cyr, Canton de Cleveland, Le Val-Saint-François RCM, Estrie, Québec, Canada
95.4km (59.3 miles) Jeffrey Mine, Val-des-Sources, Les Sources RCM, Estrie, Québec, Canada
References
 
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