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: 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...
