Chalcedony Knife, AD 1000-1200

Chalcedony is one of the cryptocrystalline varieties of the mineral quartz, having a waxy luster. Chalcedony may be semitransparent or translucent and is usually white to gray, grayish-blue or some shade of brown, sometimes nearly black. Other shades have been given different names. A clear red chalcedony is known as carnelian or sard; a green variety colored by nickel oxide is called chrysoprase. Prase is a dull green and onyx is black and white banded. Plasma is a bright to emerald-green chalcedony that is sometimes found with small spots of jasper resembling blood drops; it has been referred to as blood stone or heliotrope. Chalcedony is one of the few minerals other than quartz that is found in geodes. Chalcedony Knife Chaco Anasazi Site number, Bc 51 AD 1000-1200 Chalcedony. ... Chalcedony Knife Chaco Anasazi Site number, Bc 51 AD 1000-1200 Chalcedony. ... A cryptocrystal is a rock whose texture is so finely crystalline—that is, made up of such minute crystals—that its crystalline nature is only vaguely revealed even in a thin section by transmitted polarized light. ... This article is about minerals in the geologic sense; for nutrient minerals see dietary mineral; for the band see Mineral (band). ... Quartz is the second most abundant mineral in the Earths crust. ... For the file system called Lustre, see Lustre (file system) Lustre (American English: luster) is a description of the way light interacts with the surface of a crystal, rock or mineral. ... Carnelian is a red or reddish-brown variant of chalcedony. ... Sard is a reddish-brown chalcedony, SiO2, much used by the ancients as a gemstone. ... General Name, Symbol, Number nickel, Ni, 28 Chemical series transition metals Group, Period, Block 10, 4, d Appearance lustrous, metallic Atomic mass 58. ... An oxide is a chemical compound of oxygen with other chemical elements. ... Chrysoprase (also chrysophrase) is a gemstone variety of chalcedony (fibrous form of quartz) and contains small quantities of nickel. ... This article is about the mineral. ... This article is about the mineral. ... Red blood cells (erythrocytes) are present in the blood and help carry oxygen to the rest of the cells in the body Blood is a circulating tissue composed of fluid plasma and cells (red blood cells, white blood cells, platelets). ... A drop may be: a drop, unit of measure of volume a drop (or droplet) of liquid, such as raindrops causing a rainbow, or forming clouds or fog a drop or dropout in telecommunications, such as in losing a signal, or as in a wire dropped-down from a ceiling... Hematite (AE) or haematite (BE) is the mineral form of Iron (III) oxide, (Fe2O3), one of several iron oxides. ... Heliotrope (pronounced HEE–lee–oh–tr-oh-p) is a moderate, light, or brilliant violet to moderate or deep reddish purple. ... Geode, halved and polished. ...

The term chalcedony is derived from the name of the ancient Greek town Chalkedon in Asia Minor, in modern English usually spelled Chalcedon. Anatolia (Greek: ανατολη anatole, rising of the sun or East; compare Orient and Levant, by popular etymology Turkish Anadolu to ana mother and dolu filled), also called by the Latin name of Asia Minor, is a region of Southwest Asia which corresponds today to the Asian portion of Turkey. ... Chalcedon (Χαλκεδον, sometimes transliterated by purists as Chalkedon) was an ancient maritime town of Bithynia, in Asia Minor, almost directly opposite Byzantium, south of Scutari (modern Ãœsküdar). ...

See also

• List of minerals