There are several standard notations used by crystallographers, mineralogists, and physicists. It is used by professional mineralogists and amateur mineral collectors alike. This technique is most commonly used by mineralogists and petrologists. A.G. Laxman, Lomonosov's apprentice, one of the first Siberian mineralogists, worked in Irkutsk. In his time, he was one of the most important mineralogists in the United States. This move was controversial and was notably ignored by American mineralogists. Hagendorfite is of interest to mineralogists researching phosphate-bearing pegmatites or the dickinsonite series. The Russell Society for amateur and professional mineralogists is named in his honour. A self-employed chemical analyst, Sahlbom was contracted by mineralogists and petrographers for her proficient work. Antimonides are rare and are normally placed in the sulfide class by mineralogists. Geochemists and mineralogists have studied hydrothermal phase equilibria since the beginning of the twentieth century.