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As a rule, it is believed that if lilac-violet quartz is installed in the product, then this is necessarily an amethyst.
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.
Powellite is better known as an ore mineral of molybdenum, characteristic of the oxidation zones of sulfide molybdenum deposits.
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.
Of course, we all know about such an ore mineral as goethite, which forms dense aggregates and is widely used as an ornamental stone.
