GALENA WITH QUARTZ
A spectacular specimen of Galena with Quartz. Featuring large cubic Galena crystals clustered together and covered with perfect little quartz crystals and tiny Galena cubes on top. The term “Ay Carumba” springs to mind! This amazing piece even has some iridescence and the underside has further interesting Galena formations. A super piece that will grace any collection. A one-of-a-kind find for the serious collector.
10.5cm x 10cm x 4.5cm, 1372g.
Largest crystal face approx. 4cm square.
Krushev Dol Mine, Madan, Bulgaria
Galena is a common and popular mineral for rock hounds. Its characteristic cubes, distinctive cleavage and high density make it easy to identify. 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.
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 form natural PN Junctions like copper and copper oxide which also formed one of the first solar panels. Such an interesting subject I could on on about it.
Quartz, Silicon Dioxide:
One of the most common minerals found in the Earth’s crust. If pure, quartz forms colourless, transparent and very hard crystals with a glass-like luster. Quartz is a significant component of many igneous, metamorphic and sedimentary rocks. Silicon dioxide is found in a wide range of varieties and colours. Quartz in its polished form, was the most advanced technology thousands of years ago.