SPHALERITE GALENA QUARTZ
An aesthetic specimen featuring three minerals – gemmy golden Sphalerite, Galena & Quartz crystals on matrix. A great piece to show the different crystal forms of these minerals. Start or improve your metals collection with this oresome piece from a well-known location.
7.5cm x 4cm x 3cm, 117g.
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).
Very rare green crystals owe their colour to trace amounts of Co (Henn & Hofmann, 1985; Rager et al., 1996). Sphalerite may also contain considerable Mn, grading into alabandite.
Named by Pliny the Elder in 77-79 from the Greek “galene” meaning lead ore. 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.
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.