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Steacyite 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:Steacyite
Formula:K0.3(Na,Ca)2ThSi8O20
Comments:Many of the steacyite specimens in collections may be turkestanite. The two species cannot be visually distinguished and proper identification requires full chemical analysis. Turkestanite has been identified from multiple mineralogical environments at MSH, same as steacyite (L. Horváth 2012).
Habit:cruciform (cross-shaped) twinned, tetragonal prisms
Colour:brown, creamy white
Confirmation
Validity:Valid - Type Locality
References
References:PERRAULT, G., SZYMAŃSKI, J.T. (1982) Steacyite, a new name, and a re-evaluation of the nomenclature of "ekanite"-group minerals. Canadian Mineralogist, 20, 59-63.;
HORVÁTH, L., GAULT, R.A. (1990) The mineralogy of Mont Saint-Hilaire. Mineralogical Record, 21, 281-359.
HORVÁTH, L., GAULT, R.G., PFENNINGER-HORVÁTH, E. & POIRIER, G. (2019): Mont Saint-Hilaire: History, Geology, Mineralogy. Editor R.F. Martin. Published by the Canadian Mineralogist, Special Publication 14, 419-423.
Associated Minerals Based on Photo Data:
Gjerdingenite-Na3 photos of Steacyite associated with Gjerdingenite-Na at this locality.
Pectolite2 photos of Steacyite associated with Pectolite at this locality.
Fluorapophyllite-(K)2 photos of Steacyite associated with Fluorapophyllite-(K) at this locality.
Pyrite2 photos of Steacyite associated with Pyrite at this locality.
Leucosphenite2 photos of Steacyite associated with Leucosphenite at this locality.
Aegirine2 photos of Steacyite associated with Aegirine at this locality.
Gonnardite1 photo of Steacyite associated with Gonnardite at this locality.
Carletonite1 photo of Steacyite associated with Carletonite at this locality.
Data
Mineral Data:Click here to view Steacyite 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 (19 photos)
 
Mineral and/or Locality  
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