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Chalcedony (/ k æ l ˈ s ɛ d ə n i / kal-SED-ə-nee or / ˈ k æ l s ə ˌ d oʊ n i / KAL-sə-doh-nee) [2] is a cryptocrystalline form of silica, composed of very fine intergrowths of quartz and moganite. [3]
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.
Even though Chalcedon reaffirmed the Third Council's condemnation of Nestorius, the Non-Chalcedonians always suspected that the Chalcedonian Definition tended towards Nestorianism. This was in part because of the restoration of a number of bishops deposed at the Second Council of Ephesus, bishops who had previously indicated what appeared to be ...
Archaeologists discovered an ancient stone slab with 123 hieroglyphic symbols in Mexico, revealing the founding of a town in 569 AD and details about Maya rulers.
Chrome chalcedony is a green variety of the mineral chalcedony, colored by small quantities of chromium. [4] Its name is derived from Mutorashanga, a small ferrochrome mining town in Zimbabwe where the mineral was discovered in the 1950s.
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 ...
The Greek and Latin names are taken from the river Achates (the modern Dirillo), in Sicily, where this stone was first found (Theophrastus, "De lapid.", 38; Pliny, "Hist. nat.", XXXVII, liv). The stone belongs to the silex family (chalcedony species) and is formed by deposits of siliceous beds in hollows of rocks. This mode of formation results ...
Chalcedonian Christianity is a term referring to the branches of Christianity that accept and uphold theological resolutions of the Council of Chalcedon, the fourth ecumenical council, held in AD 451. [1]