Anatase
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.
Aegirine
Ancylite-(Ce)/Calcioancylite-(Ce)
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...
Aegirine
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,...