Formula: ZnS Sphalerite is one of the most abundant sulphide minerals at Mont Saint-Hilaire. Colours include yellow, green, brown, red, orange, black or colourless, and range in size from a millimetre or less, up to several centimetres. It can be found in well-formed tetrahedral, pseudo-octahedral, dodecahedral, and twinned crystals.
Formula: TiO2 Anatase is a common accessory mineral in many environments at Mont Saint-Hilaire. It generally occurs as bipyramidal crystals or thin plates, and also as pseudocubic crystals. Black to dark blue are the most common colours.
Formula: NaBSi2O5(OH)2 Searlesite is a rare mineral at Mont Saint-Hilaire, and was a one-time find in small cavities in nepheline syenite. It occurs as sharp colourless elongated bladed to columnar crystals. It fluoresces a weak bluish-green under shortwave ultraviolet light.
The Micro minerals of Mont Saint-Hilaire, Quebec book, with drawings / by R.W. Fisher & G.H. Glenn, is a roughly 200-page book depicting the minerals of Mont Saint-Hilaire as they really occur. Bob and Garry compiled extensive drawings with accompanying text to describe a broad spectrum of the species from...
Formula: Ca3Fe3+2(SiO4)3 Andradite is relatively rare, but is the most abundant of the Garnet Group minerals. It occurs in miarolitic cavities in nepheline syenite, in marble xenoliths, and associated skarn contact zones. Crystals are generally rhombic dodecahedrons, with colours ranging from yellowish-green to dark olive-green. Yellow octahedral crystals such as...
Formula: CeSr(CO3)2(OH)·H2O/(Ce,Ca,Sr)CO3(OH,H2O) Ancylite-(Ce) and calcioancylite-(Ce) are two common species at Mont Saint Hilaire. They occur in the same mineralogical environments, and can occur together, and are essentially identical in appearance. Without analysis, you can’t be sure which species is present, and possibly both! It occurs as prismatic crystals, or as...
Formula: Fe2+3Al2(SiO4)3 Almandine is rare at Mont Saint Hilaire, and occurs as roughly spherical, anhedral crystals in a granitic dyke.
Formula: NaFe3+Si2O6 Aegirine is the most common pyroxene mineral at Mont Saint-Hilaire, and is a major constituent of pegmatites. Crystals range from tiny crystals up to prismatic crystals up to 30cm long. Smaller crystals can range in colour from very pale to dark green (most common), yellow, brown or red,...
