A Bismuth Specimen also known as Element 83. This is 99% Pure Bismuth. This is the stuff that they use to create the amazing multi coloured crystal clusters. A great little sample for the collection. This mineral whether in its natural native form or in this lab created type has some truly amazing properties that puts it in a class of its own.
3cm x 1.6cm x 3cm, 62g.
Of interest to hobbyists are the pseudocubic hopper crystals that are present on laboratory produced specimens. Hopper crystals are a unique crystallographic curiosity. Just the edges extend outward from the center of the crystal leaving hollow stairstep 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. The second most paramagnetic material occurring naturally. Of only a few heavy metals used as medicine (antacid).