Gehlenite is a mineral with the chemical formula Ca2Al2SiO7. It is a member of the pyroxene group of minerals and is named after the German chemist Christian Heinrich Pfaff who named it after his friend and colleague Johann Nepomuk von Fuchs, who was also known as Johann von Fuchs-Göhlen. Gehlenite is typically found in calcium-rich metamorphic rocks and skarns, as well as in volcanic and plutonic rocks. It has a brownish-red to gray color and a vitreous to greasy luster. Its crystal structure is tetragonal and it has a hardness of 6-6.5 on the Mohs scale. Gehlenite has several industrial uses, including as a raw material for the production of refractory materials and as an additive in the production of cement. It is also used in the manufacture of high-temperature insulation materials and as a component in some types of glass and ceramics. In addition to its industrial applications, gehlenite is also a popular mineral among collectors and is often used in jewelry and other decorative items.
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