Mn₄Be₃(S(SiO₄)₃)

This sample containing helvite is displayed in the Smithsonian Museum of Natural History. The sample is described as spessartine with helvite, quartz, and microcline. Helvite is a silicate mineral of beryllium, sulfur and manganese with the composition Mn₄Be₃(S(SiO₄)₃). The sample at left is about 20 cm long and is from Tongbei, Fujian Province, China. The black crystals are taken to be spessartine, the orange helvite, and the tan microcline.