The most popular of the log geodes must be those containing crystals of Amethyst. This purple variety of quartz varies from pale lilac color to intense purple, and has been known since ancient times. It gets its name from Greece, where ancient mythology held that Amethyst would prevent a person from becoming drunk.
Due to the very hard matrix (aka host) rock in which they form, heavy equipment and hard-rock mining techniques are utilized to recover these specimens. When all goes well, they are able to remove the geodes intact, and then apply their artistic talents. Arguably the most popular form is the "Amethyst Cathedral". In this presentation, the log geode is cleaned of excess matrix and cut length-wise. Frequently, it it necessary to use concrete or cement to build a flat base upon-which the specimen may sit solidly. Sometimes, cement or grout is applied to the outside of the specimen to strengthen the piece, and paint is applied to provide a uniform appearance to the exterior. So, while the Amethyst occurs naturally in geode form, some artistic license is used to deliver the best presentation.
Prevailing scientific opinion seems to hold that Amethyst is purple for two reasons (1) the presence of tiny amounts of iron in the Quartz, and (2) having been subjected to some kind of natural radiation. The color can be changed to yellow (Citrine) or green (green Amethyst) by application of heat. And, prolonged exposure to sunlight will cause the purple to slowly fade in intensity.
We try to keep several Amethyst Cathedral specimens on-hand at Crystal Moon Gallery, and most are visible on our website. Please let us know if we can help you with some of these decorator specimens.
Cathedral quartz can also be known as Atlantean Temple Quartz. The name Cathedral quartz comes from the stepped or layered effect, which is also referred to as lightbrary. It is a beautiful Brazilian crystal.
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