Simpsonite is one of the rare collectible gemstones. This mineral is found in the form of gem-quality precipitates in Australia, Brazil and Zimbabwe. In the places where this mineral is located, known in other countries, including Russia, no stones suitable for making gem-quality cut have been found. The mineral is characterized by a range of colors in yellow tones, up to colorless. The hardness of the mineral - 7-7.5 makes it suitable for use not only in the form of collection cuts, but also for inserts into jewelry. The mineral received its name, of course, not in honor of the famous cartoon American family. The mineral was named after the Australian mineralogist, chemist and educator - Edward Sydney Simpson (1875-1938).
In gemology, speaking of olivines, they most often mean forsterite (including synthetic, sometimes imitating tanzanite) and chrysolite (a jewelry variety of forsterite with a small amount of fayalite minal), sometimes they recall tephroite, which is part of rhodonite rocks, as well as fayalite.
Everyone knows such minerals associated with carbon and organic matter as diamond and numerous fossil resins, the most prominent representative of which is Baltic amber (succinite or hedano-succinite). But in the bowels of the earth, organic matter can also give other gems, one of which is mellite.