This is a very beautiful, and very unusual, Violet Botryoidal Chalcedony, which is also known as Grape Agate. This stone is from Manakarra Beach, in West Sulawesi in Indonesia, and these specimens are found "growing" on a bed of coral. In fact, the other colors visible in many of these botryoidal cluster "bunches", (that are not purple), were caused by living organisms growing on the coral, (which caused blue, green, pinkish purple, and ivory colors!)
11 grams 35.25mm x 23.36mm x 26.23mm Note: The measurements are approximate as this stone is difficult measure
According to Wikipedia, "Chalcedony (pronunciation: /kælˈsɛdəni/) is a Cryptocrystalline form of Silica, composed of very fine intergrowths of Quartz and Moganite. These are both Silica minerals, but they differ in that Quartz has a trigonal crystal structure, while Moganite is monoclinic. Chalcedony's standard chemical structure (based on the chemical structure of Quartz) is SiO2 (Silicon Dioxide).
Chalcedony has a waxy luster, and may be semitransparent or translucent. It can assume a wide range of colors, but those most commonly seen are white to gray, grayish-blue or a shade of brown ranging from pale to nearly black. The color of Chalcedony sold commercially is often enhanced by dyeing or heating.
The name Chalcedony comes from the Latin Chalcedonius (alternatively spelled Calchedonius). The name appears in Pliny the Elder's Naturalis Historia as a term for a translucid kind of Jaspis. The name is probably derived from the town Chalcedon in Asia Minor. The Greek word Khalkedon (χαλκηδών) also appears in the Book of Revelation (Apc 21,19). It is a Hapax Legomenon (the term for a word found nowhere else) so it is hard to tell whether the precious gem mentioned in the Bible is the same mineral known by this name today."
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