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What Is An Amethyst Geode
Amethyst geodes commenced life when a volcano erupted. As the lava flowed to the surface, gas pockets were entombed in the solidified lava, customarily in a form of volcanic rock called basalt. Deep below the solidified basalt, Mother Nature continued to maintain an especially hot molten lava structure. From time to time, super-hot fluids would rise from the molten lava area and find their way to the gas pockets through little crevices and cracks in the basalt. These liquids carried with them the mineral components to build a stunning crystal. In the case of amethyst, these involved the components of silica dioxide (SO2, the chemical formula for quartz) and small amounts of iron ions. As the quartz crystalized, little impurities of the iron ions would take the place of silica in some of the molecules, providing the base for amethyst coloring. If the molecules were then also subject to comparatively extreme heat levels and small quantities of radiation, a beautiful deep rich purple amethyst crystal would be born. Heat most frequently would come from the adjacent lava structure, and the miniscule amounts of radiation required would come from rocks like granite that give up small quantities of radiation as they slowly rot.
Over millions of years, Mother Nature would typically do many cycles of this super-hot, mineral carrying liquids inundation process. Dependent on the exact mineral composition of the liquids at different times, different colours of crystals and indeed different mineral crystals might be formed. Quite often, the quartz that forms in a geode could include a big amounts of clear or milky white quartz as well as the purple amethyst. Less frequently, wholly different kinds of crystals can be created on top or embedded in the quartz most often this takes the shape of interesting, accenting crystals of calcite. Most frequently the calcite crystals are clear or white, but occasionally they are a very interesting hue of pink.
In principle, geodes can be found anywhere on earth where volcanos assisted in shaping the earth’s crust. Volcanos are vital mountain range builders, and most existing sources of geodes are in or near mountains. For amethyst, some of the most significant deposits are found in South America. A massive area in southern Brazil contains large basalt structures, plenty of which contain geodes of diverse qualities. Brazil is easily the biggest exporter of amethyst geodes by volume. Across the border in Uruguay, a far smaller area contains significant deposits of a few of the world’s very best coloured amethyst geodes. Also close by, in eastern Bolivia, there are a few mines that contain amethyst deposits that include cavities with large crystals. It is unreal to extract these huge crystals in a total geodes due to the enormous amounts of rock concerned, but from time to time clusters or individual crystals removed from those structures make their way to the USA.
Many types of crystals form in the pockets and crevices that gas pockets form in solidified lava. In the rock type basalt, several categories of zeolite minerals also form lovely geodes. Amongst these are brilliant green or wonderfully clear apophyllite, regularly accompanied by peach colored stilbite or white scolecite are found in large quantities in the Decca Flats area in India. Also frequently forming in basalt structures are other forms of quartz like agate, chalcedony, onyx and jasper. In granite pegmatites (granitic lava that formed under ground, often in a columnar structure) plenty of the planet’s best precious stones crystalize. These include diamonds, emeralds, topaz, tourmalines, and exquisite individual quartz crystals. These granitic structures are also found in areas shaped by volcanos.
Removing geodes is basically a well refined mining process. Though the process involves heavy hardware and explosives to reach geode making areas in the basalt, all the main work involves a large dose of manual work. The geodes are first exposed thru mining efforts. The basalt is removed showing the shape of a geode in the floor, wall or ceiling of the mine. The step after that is to look at the inside of the geode to figure out if the crystals are of high enough value to pay for the manual effort needed to take the geode. This is most often done by cutting an inconspicuous hole in the geode and inserting a little light and viewing device which resembles a flexible periscope.
If the color is a standard color like milky white quartz, the geode will be bypassed and regularly destroyed in subsequent mining efforts. If the crystal is amethyst of a good color, then the geode will be. Chipped out of the basalt a little at a time. This process can need days of work for a single amethyst geode. Once the geode has been removed from the base basalt, it is then carried to a workshop some distance from the mine. This typically includes the use of a wheel barrow to manually remove it from the mine itself, and then a truck, narrow gauge rail auto, or truck to carry the piece to the workshop.
At the workshop any remaining basalt is removed and the geode is cut to show the crystals. Most frequently, geodes are of a broadly columnar shape. These will be cut vertically along the longest piece of the geode. These pieces are then prepared as a form commonly known as a cathedral. The geode at this early stage has an exteriors layer that contains many , many pointed bumps of the base level of the quartz. These are threatening to both the employees and to the ultimate consumer. To avoid the attendant danger, the geode is covered in a delicate layer of cement to cover the pointed points. The cement is then ordinarily painted with a flat black colour to enhance the aesthetics of the purple amethyst crystals. If the piece is to be shown as a cathedral there will often also be a small fill of cement at the base of the piece to form a level structure on which to stand the piece. Any remaining pointed quartz points along the entrance to the geode are then polished to a smooth surface for both appearance and safety reasons.
Touchstone Gallery carries extremely high quality mineral and fossils and sees its role as supplying very attractive geodes that are appropriate for use as exquisite accents in your home or office. As a consequence, we select only particularly high quality amethyst geodes to market.
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