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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).

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Powellite is better known as an ore mineral of molybdenum, characteristic of the oxidation zones of sulfide molybdenum deposits.

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Of course, we all know about such an ore mineral as goethite, which forms dense aggregates and is widely used as an ornamental stone.