TOP GALENA SPECIMEN
Stunning Top Galena Specimen, very well formed and shiny. This is a really aesthetic piece with great shape, well formed crystals and glossy wet surfaces. The Crystals have formed Cubic shape with the corners missing forming a Cuboctahedron or Octacube. There is a small section of Truncated (stepped) Crystal Galena and a few small Quartz Crystals. There is some micro Pyrite Crystals on a few sides of the larger Galena Crystals. I suspect there is a higher Silver content which helps create these glossy Crystals, amazing. A superb specimen from a premier location. Difficult to photograph with high reflection. Start or add to your own metals collection.
5.8cm x 3.5cm x 3.8cm, 144g.
Galena is a common and popular mineral for rock hounds. Its characteristic cubes, distinctive cleavage and high density make it easy to identify and a favorite in high school geology labs. The structure of Galena is identical to that of halite, NaCl. The two minerals have the same crystal shapes, symmetry and cleavage. Some Galena may contain up to 20% silver in place of lead. The large volume of Galena that is processed for lead produces enough Silver as a by product to make Galena the leading ore of Silver.
One of the first transistors was a Galena Crystal and with a copper wire called “cats-whisker-with crystal”. Galena is a natural semiconductor. Really it formed part of a transistor, a more reliable PN junction or Diode. Metal Sulfides were experimented with in the late 1800s and early 1900s as they form natural PN Junctions like copper and copper oxide (Verde or Patina) which also formed one of the first solar panels. Such an interesting subject I could on on about it.