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The color of chalcedony sold commercially is often enhanced by dyeing or heating. [4] The name chalcedony comes from the Latin chalcedonius (alternatively spelled calchedonius) and is probably derived from the town of Chalcedon in Turkey. [5] The name appears in Pliny the Elder's Naturalis Historia as a term for a translucent kind of jaspis. [6]
The two can be distinguished with a Chelsea color filter, as chrome chalcedony will appear red, whilst chrysoprase will appear green. [4] [9] Chrome chalcedony (unlike chrysoprase) may also contain tiny black specks of chromite. [3] Chrome chalcedony is (together with agate, carnelian, chrysoprase, heliotrope, onyx and others) a variety of ...
Chalcedon was an episcopal see at an early date and several Christian martyrs are associated with Chalcedon: The virgin St. Euphemia and her companions in the early 4th century; the cathedral of Chalcedon was consecrated to her. St. Sabel the Persian and his companions. It was the site of various ecclesiastical councils.
At the far end of the color spectrum, we find purple gemstones like iolite and amethyst, which can represent our crown chakra, a symbol of connectedness to the ethereal realms and oneness with the ...
Other colors of chalcedony may also occur in Indian bloodstone, such as white, yellow, or blue. This semiprecious stone should not be confused with other ornamental stones that contain red jasper. Setonite, also called African bloodstone, is composed of red jasper, grey chalcedony, and pyrite .
Rock art found in southeastern Venezuela may have come from a previously unknown culture. Researchers believe that the roughly 4,000-year-old art signifies a central dispersion point from which ...
Mineral symbols (text abbreviations) are used to abbreviate mineral groups, subgroups, and species, just as lettered symbols are used for the chemical elements. The first set of commonly used mineral symbols was published in 1983 and covered the common rock-forming minerals using 192 two- or three-lettered symbols. [ 1 ]
The following is a list of various types of marble according to location. (NB: Marble-like stone which is not true marble according to geologists is included, ...