RICH GOLD BEARING BISMUTHINITE
A stunning ore specimen of Rich Gold Bearing Bismuthinite. Hefty in weight with the two exceptional metals with exceptional properties. This Flour Gold in Bismuthinite would make a stunning specimen. This material as a specimen is not common. The precious Gold ore was missed by several geological surveys as they didn’t think Gold was found in Bismuth. It turned out to be one of the richest high grade Gold ores found in Australia.
4.9cm x 2.6cm x 4.8cm, 96g.
Tennant Creek, Northern Territory, Australia.
Gold is a pleasure to own and possess, as many people have discovered throughout the ages and around the world. Au is a very stubborn element when it comes to reacting to or combining with other elements. Keeping this in mind, helps to explain many things about gold. There are very few true gold ores, besides native gold, because it forms a major part of only a few rare minerals. Found as little more than a trace in a few others or it is alloyed to a small extent with other metals such as silver.
Gold is almost indestructible naturally occurring material. Used and then reused for centuries to the extent that all gold of known existence is almost equal to all the gold that has ever been mined. Gold is a great medium metal for jewelry, as it never tarnishes. Native gold wires emerging from massive white quartz can make for a visually stunning specimen.
A few of the minerals that bear gold in their respective formulas are in a subclass of sulfides called the tellurides. The element gold seems to have an affinity for tellurium and this is one of the only elements that gold can bond with easily. In fact only a few rare tellurides are found with out gold. Some tellurides are nagyagite, calaverite, sylvanite and krennerite. These are all minor ores of gold but their contributions to the supply of gold pales next to native gold’s own contribution. Occasionally these minerals are associated with native gold.
There are a number of minerals that are aptly named “Fool’s Gold” because only a fool could believe they are gold! Actually it is easy for people who see shiny golden colored flakes sparkling at them from some rock they just picked up to believe that they have struck pay-dirt. Gold’s ductility, sectility, density and softness are usually sufficient to distinguish it from the much cheaper imposters.
The most famous “fool’s gold” is the very common sulfide, pyrite. Chalcopyrite, marcasite and just about any golden colored sulfide has been also proven to be worthy the “fool’s gold” monicure. Weathered flakes of biotite which can sport a bright yellow color and a nice flash of light when viewed just right have also been mistaken for gold.
Gold specimens are sometimes artistically stunning and a good investment as well. After all, it is gold, which never seems to lose its value. Good natural specimens though are more expensive than their actual weight value. This is to be expected as good gold crystals are somewhat scarce. Most are melted down for quick profits, you really don’t want a natural specimen to be worth what a lump of previously smelted and refined gold is worth.
Bismuth is rarely found in nature in its elemental form. Of interest to hobbyists are the pseudocubic hopper crystals that are present on the laboratory produced specimens, they are only seen in the rarest of natural crystals. It is the second most paramagnetic material occurring naturally and is of only a few heavy metals used as medicine antacid.
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 oxide is used in medicine such as quick ease to reduce stomach acid build up. Bismuth is Element 83 on the Periodic Table.