GALENA QUARTZ SPHALERITE
An incredible metal specimen featuring Galena Quartz Sphalerite crystals. The base of Galena is covered in tetrahedral Sphalerite with cubic Galena crystals on top. Thin, clear, terminated Quartz crystals cluster around them. Some pyrite or chalcopyrite is also visible on the matrix. This is why Bulgarian minerals are so cool and so highly sought after. To have 3 perfect crystal shapes on one specimen is awesome!
Borieva Mine, Madan, Bulgaria.
8cm x 5cm x 2cm, 178g.
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).
Quartz is the most common mineral found on the surface of the Earth. A significant component of many igneous, metamorphic and sedimentary rocks, this natural form of silicon dioxide is found in an impressive range of varieties and colours. There are many names for different varieties: Cryptocrystalline varieties of quartz are listed separately under chalcedony and include agate.