INSIDE: Amethyst cathedrals are beautiful, powerful, miraculous, and every one of them is ancient. No one can escape their draw, yet most of us have no idea how they came to be. If amethyst cathedrals have intrigued you, and you’ve found yourself wondering how they are formed, read on!
Have you ever cracked open a small geode that you bought at a store?
If you have, then you’ve witnessed how miraculous and fascinating it is to see the wonderous, sparkling beauty that reveals itself from inside such an unassuming, rather boring rock.
Multiply that effect times a thousand, and you might be able to understand what it would feel like to discover an amethyst geode the length of your arm.
Amethyst cathedrals and geodes are beautiful.
They are powerful.
They are miraculous, and every one of them is ancient.
No one can escape their draw, yet most of us have no idea how they came to be.
If amethyst geodes and amethyst cathedrals have intrigued you, and you’ve found yourself wondering how they are formed, read on!
Where Do Amethyst Cathedrals Comes From?
An amethyst cathedral, otherwise known as an amethyst church, is a geode that is typically tall and thin and shaped like the arch of a cathedral.
Amethyst is a type of quartz that contains a few parts per million of iron, providing its incredible purple color.
While amethyst geodes are found in Mexico, Uruguay, and even the United States, most of the amethyst geodes and amethyst cathedrals that are the most attractive and contain the deepest purple color comes from Rio Grande do Sul, Brazil.
These amethyst geodes from Brazil are mined from lava flows in the Parana Continental Flood Basalt Province, which is one of the most massive basalt lava outpourings that have been discovered to date. According to Show Me Rockhounds, approximately 800,000 cubic kilometers of lava extruded in this area over an 11 million year time span. And that occurred about 130 million years ago!
As you can see, owning an amethyst cathedral means you own a piece of the earth that existed millions of years ago. Perhaps, the ancient wisdom that is contained in the amethyst is the reason it holds such transformative, healing powers. Afterall, the healing benefits of amethyst are quite extensive.
How is an Amethyst Cathedral Formed?
Amethyst cathedrals are partially man-made. However, the beautiful crystal part of the geode forms naturally over many thousands or millions of years before it is even touched by people.
The Natural Formation of Amethyst Geodes
Step 1 – Gas Bubbles Form Cavities in Lava
The first step in the formation of an amethyst geode occurs from the flow of lava. Gas bubbles within the lava rise to the top, just like the bubbles you see when you pour a soda. When the lava cools quickly, the lava thickens, and the bubbles can’t reach the top. Those trapped bubbles form hollow cavities as the lava hardens around it.
The size of these bubbles can range from microscopic to fifteen feet long. Typically, they are longer than they are wide, which is where the cathedral name came from – when they are cut in half, each half resembles a church cathedral.
Step 2 – Crystals Form Inside the Cavity
When referring specifically to the lava flows in Brazil, it is thought that water from an aquifer below the lava was at some point forced out and up into the cavities in the lava. Since it was basalt lava and basalt is porous, the water was able to penetrate the hollow cavities.
The water that entered the cavities was salt water that contained inclusions of silica and other minerals from the ground below. Then, cooling and pressure release over many thousands and sometimes millions of years grows the crystals inside the cavity.
The mineral inclusions that are trapped within the geode cavity determines what type of crystals will be inside. In Rio Grande do Sul, Brazil, the minerals trapped in the cavities form layers within the cavities, which typically include celadonite first, then agate, then quartz, and finally amethyst. Sometimes calcite, euhedral crystals, and gypsum inclusions can be found as well.
Other lava flows in other areas will yield different variations of minerals. For example, the amethyst geodes in Uruguay don’t contain the celadonite coating.
The Natural Formation of the Layers Inside an Amethyst Cathedral
This example is taken from the lava flows of Rio Grande do Sul, Brazil. Other lava flows in other areas will vary, but the same general concept takes place in the formation of an amethyst geode.
1) The outer layer of the amethyst geode is basalt, which is what created the cavity that remained empty for millions of years before the crystals grew inside.
2) The next layer along the inside of the cavity is composed of green celadonite (from the mica mineral group).
3) Agate (a variety of quartz) then formed along the inside of the celadonite.
4) Next, you’ll find colorless quartz (silica).
5) Finally, the last layer is amethyst, which is composed of silica and iron.
The Man-Made Process -…
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