Poudretteite is a new mineral species from the Poudrette quarry, Mont Saint-Hilaire, Quebec. It occurs in a marble xenolith included in nepheline syenite, associated with pec- tolite, apophyllite, quartz and minor aegirine. It forms clear, colorless to very pale pink, equidimensional, subhedral prisms up to 5 mm.

What is the rarest crystal on Earth?

Taaffeite is considered the rarest crystal in the world because there are only around 50 known samples of this rare gemstone. When Taaffeite was first identified in 1945 by Irish gemologist Edward Taaffe (the rare crystal's namesake), he initially thought it was a spinel.

What is the most rare gemstone?

Musgravite. Musgravite was discovered in 1967 and is arguably the rarest gemstone in the world. It was first discovered in Musgrave Ranges, Australia, and later found in Madagascar and Greenland. The first sizable gem-quality specimen was discovered in 1993.