Embedded Cummingtonite crystals from Stolberg, Sweden – miniature specimen as unique piece
This small cabinet specimen shows embedded Cummingtonite crystals from Stolberg, Sweden. The piece displays a dark gray to black brown surface with a slightly shimmering appearance and a typical fibrous to radiating structure characteristic of this amphibole mineral.
The Cummingtonite crystals are clearly recognizable and form a dense intergrown aggregate within the matrix. Particularly striking is the fine fibrous and partly radial crystal development, giving the specimen a vivid texture and a subtle silky luster.
Geology & Origin
Cummingtonite belongs to the amphibole group and typically forms under metamorphic conditions, especially in iron and magnesium rich rocks. It commonly develops as fibrous or prismatic crystal aggregates closely intergrown with the host rock.
Localities in Sweden such as Stolberg are known for their complex metamorphic geology, where numerous amphiboles and other silicate minerals formed under high pressure and temperature conditions.