Hedenbergiitti

Hedenbergiitti is a relatively rare mineral. It is a silicate mineral belonging to the amphibole group. Its chemical formula is (Na,Ca)2(Fe3+,Al,Mg)5(Si,Al)8O22(OH,O)2. The mineral typically appears as a dark green to black, prismatic crystal. It can also be found in a granular or massive form. Hedenbergiitti is characterized by its relatively high iron content.

The hardness of hedenbergiitti on the Mohs scale is typically between 5 and 6. Its specific gravity is around 3.2 to 3.4. It is generally opaque or translucent, with a vitreous to dull luster. It is not a widely known or economically significant mineral.

Hedenbergiitti was first discovered in the Hedenberg mine in Värmland, Sweden. It was named in honor of Johan Adam Hedenberg, a Swedish chemist. The type locality is important for mineral identification and historical context. The mineral is found in metamorphosed igneous rocks and some high-grade metamorphic terrains. It often occurs in association with other iron-rich minerals. Notable occurrences have been reported in Sweden, Finland, and some locations in North America. Its geological formation is linked to specific metamorphic conditions.