- Lindqvistite (type locality) with Plumboferrite, Jacobsite, Malachite, and Azurite
- Jacobsberg mine, Nordmark, Filipstad, Varmland, Sweden
- Miniature, 4.5 x 4.0 x 3.0 cm
- Ex. Paulo Matioli; Swedish Museum of Natural History
A classic from the type locality. A granular, fine-grained aggregate consisting of black, subhedral lindqvistite with brown internal reflections, gray-black, subhedral to euhedral dipyramids of jacobsite, and black plumboferrite inter-grown with white dolomite and localized bands of malachite and minor azurite. Lindqvistite is a rare lead manganese iron oxide; plumboferrite is an oxide of similar but more complex crystal chemistry and jacobsite is a manganese iron oxide. Specimens exhibiting good malachite and azurite from Langban are not common! Ex. Paulo Matioli collection.