description Gahnite Overview
Gahnite is the zinc-rich spinel-group mineral with the ideal formula ZnAl2O4. It was described from the Falun mine in Sweden in 1807, and its name honors Swedish chemist and mineralogist Johan Gottlieb Gahn. It commonly forms dark green, bluish green, blue, or nearly black crystals and granular masses in granite pegmatites, metamorphic rocks, and metamorphosed sulfide deposits; specimens are chiefly collected for mineral study, while transparent material can be cut as a gemstone.
help Gahnite FAQ
What is gahnite?
Gahnite is the zinc-rich member of the spinel group, with the ideal formula ZnAl2O4. It commonly forms dark green, bluish green, blue, or nearly black crystals.
Where was gahnite first described?
Gahnite was described from the Falun mine in Sweden in 1807. Its name honors the Swedish chemist and mineralogist Johan Gottlieb Gahn.
How is gahnite related to spinel?
Gahnite and spinel share the same general spinel-group crystal structure. Gahnite is zinc-rich, whereas common spinel is typically magnesium-rich and has the formula MgAl2O4.
Why can gahnite be mistaken for other dark minerals?
Its dark color and strong luster can make gahnite resemble black spinel or other opaque minerals. Crystal shape, locality, hardness, and chemical testing are used to identify it reliably.
explore Explore More
Reviews & Comments
Write a Review
Be the first to review
Share your thoughts with the community and help others make better decisions.
