NATIVE BISMUTH SPECIMEN
Rare Native Bismuth Specimen. A beauty with characteristic silver gold colour on some of the crystals in this specimen. Sits on a matrix of Quartz. A rare metal specimen to enhance your mineral collection.
5.4cm x 4.2cm x 2.4cm, 76g.
Wolfram Camp, Queensland, Australia.
Rarely found in nature in its elemental form. These crystals, while not natural, are nonetheless very interesting to the mineral hobbyist and to others. The unique look that these clusters offer is really indescribable. Its colour consists of iridescent metallic yellow, blue and green hues.
Of interest are the pseudocubic hopper crystals that are present on the laboratory produced specimens. They are seen in only the rarest of natural crystals. Hopper crystals are a unique crystallographic curiosity. Just the edges extend outward from the center of the crystal leaving hollow stair step faces between these edges. The hopper crystals form due to the disparity of growth rates between the crystal edges and the crystal faces. A few interesting properties is that Bismuth shrinks when heated. It is the second most paramagnetic material occurring naturally.
A couple of interesting facts about the metal Bismuth are:
It is the second most paramagnetic material naturally occurring, the first is Graphite. This is great to make magnetic levitating displays using neo magnets.
It shrinks as it heats up, only a few substances do this like water up to 4 degrees C. It has a low melting point so you can melt it in a pot on the stove. Bismuth is Element 83 on the Periodic Table.