Aragonite
Aragonite. A pale yellow mineral with a glassy luster. Translucent, brittle, and easily broken under mechanical stress. Aragonite is a […]
Mineral
Diorite porphyrite
Diorite porphyrite. A magmatic rock, classified as a hypabyssal (subvolcanic) intrusive formation. By composition, it is close to diorite but
Quartz fragment
Quartz part. A mineral specimen consisting of quartz with inclusions of wolframite, pyrite, and bismuthinite. This mineral association formed as
Bornite
Bornite. A ore sample of bornite-magnetite-chalcopyrite type. It contains minerals like bornite, magnetite, and chalcopyrite. Bornite is characterized by a
Rock crystal
Rock crystal. A variety of quartz, represented by transparent crystals of prismatic shape. The surface of the crystals is covered
Chalcopyrite
Chalcopyrite. A mineral sample of chalcopyrite-arsenopyrite type in a calcite-quartz mineral association. Chalcopyrite has a predominant brownish-yellow color and a
The intergrowth of chlorite, chalcopyrite, and arsenopyrite
The association of chlorite, chalcopyrite, and arsenopyrite. The sample contains the minerals chlorite, chalcopyrite, and arsenopyrite. Chlorite is black, chalcopyrite
Malachite in association with barite
Malachite with barite. The chemical formula of malachite: Cu₂CO₃(OH)₂. Malachite is represented as green streaks on the surface of barite.
Quartz geodes
Quartz geode. A natural mineral formation consisting of large quartz crystals in prismatic form. The crystals are transparent and have
Large crystal blue marble
Coarse-grained blue marble. Contains calcite (CaCO₃), inclusions of garnet (grossular), as well as impurities of bornite (purple) and chalcopyrite (yellow).