CHALCOPYRITE GALENA SPHALERITE
An unusual cluster with Chalcopyrite Galena Sphalerite all in one! A classic mineral combo from Madan of three important ores. The matrix is a mix of galena and sphalerite with cubic chalcopyrite crystals on top. Several of the chalco crystals on the specimen are multicoloured, giving the whole piece an otherworldly appearance. A great addition to a metals collection for the formation and location.
Krushev dol Mine, Madan, Bulgaria
11cm x 7cm x 3cm, 439g
Galena is the primary ore mineral of lead. Worked for its lead content as early as 3000 BC, it is found in ore veins with sphalerite, pyrite, chalcopyrite, tennantite-tetrahedrite, etc. and in skarns, as well as in sedimentary rocks where it may replace carbonate beds or be deposited in pore spaces. The crystals are bright when fresh but often tarnish after exposure to air.
Sphalerite, also known as Blende or Zinc Blende, is the major ore of zinc. When pure (with little or no iron) it forms clear crystals with colours ranging from pale yellow (known as Cleiophane) to orange and red shades (known as Ruby Blende), but as iron content increases it forms dark, opaque metallic crystals (known as Marmatite).
A major ore of copper. Common in sulfide veins and disseminated in igneous rocks.
Weathering may lead to the formation of malachite, azurite, brochantite, langite and numerous other secondary copper minerals.