Chalcedony knife, AD 1000-1200

"Bloodstone" redirects here. For the computer game, see Bloodstone (computer game). For the Marvel Comics characters, see Bloodstone (comics) and Elsa Bloodstone.

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. Flint is also a variety of chalcedony. Chalcedony Knife Chaco Anasazi Site number, Bc 51 AD 1000-1200 Chalcedony. ... Chalcedony Knife Chaco Anasazi Site number, Bc 51 AD 1000-1200 Chalcedony. ... Bloodstone is a 1993 high fantasy computer role-playing game developed and published by Mindcraft Software. ... Marvel Comics is an American comic book line published by Marvel Entertainment, Inc. ... Ulysses Bloodstone (whose real name is unrevealed) is a fictional character appearing in the Marvel Comics universe. ... Elsa Bloodstone is a fictional character in the Marvel Comics universe who first appears in the Bloodstone mini-series of 2001. ... 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. ... Minerals are natural compounds formed through geological processes. ... Quartz is one of the most common minerals in the Earths continental 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. ... Imprint of a carnelian seal with Brahmi inscription Kusumadasasya (Flowers servant). 4-5th century CE, probably Punjab. ... 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) that contains small quantities of nickel. ... Prase is a green translucent chalcedony (quartz). ... Onyx is a banded variety of chalcedony, a cryptocrystalline form of quartz. ... Jasper pebble, one inch (2. ... Human blood smear: a - erythrocytes; b - neutrophil; c - eosinophil; d - lymphocyte. ... Pebble beach made up of flint nodules eroded out of the nearby chalk cliffs, Cape Arkona, Rügen Flint (or flintstone) is a hard, sedimentary cryptocrystalline silica rock with a glassy appearance. ...

People living along the Central Asian trade routes used various forms of chalcedony, including carnelian, to carve intaglios, ring bezels (the upper faceted portion of a gem projecting from the ring setting), and beads that show strong Graeco-Roman influence. Fine examples of first century objects made from chalcedony, possibly Kushan, were found in recent years at Tillya-tepe in north-western Afghanistan. Hot wax would not stick to it so it was often used to make seal impressions. Map of Central Asia showing three sets of possible boundaries for the region Central Asia located as a region of the world Central Asia is a vast landlocked region of Asia. ... Imprint of a carnelian seal with Brahmi inscription Kusumadasasya (Flowers servant). 4-5th century CE, probably Punjab. ... Intaglio is a printmaking technique in which the image is incised into a surface. ... Boundary of the Kushan empire, c. ... Look up seal in Wiktionary, the free dictionary. ...

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... Chalcedon (Χαλκεδον, sometimes transliterated by purists as Chalkedon; see also list of traditional Greek place names) was an ancient maritime town of Bithynia, in Asia Minor, almost directly opposite Byzantium, south of Scutari (modern Ãœsküdar). ...

Geochemistry: Chalcedony

Chalcedony is more soluble than quartz under low-temperature conditions. It is, however, crystallographically identical to quartz. A mineral with the exact same crystallographic and chemical properties should have the same bulk thermodynamic properties (properties which are used to predict solubility). But chalcedony is extremely finely grained (cryptocrystalline), and has a very high surface area to volume ratio. It is believed that this property of chalcedony is responsible for its higher solubility. It has been suggested that this article or section be merged with Solution. ...

This is a cool rock.

External Links

• http://www.mindat.org/min-960.html
• http://minerals.usgs.gov/minerals/pubs/commodity/gemstones/sp14-95/chalcedony.html

Solubility of Quartz and Chalcedony in Pure Water

This table gives equilibrium concentrations of total dissolved silicon as calculated by PHREEQC using the llnl.dat database.

References

• See Section 12 of the translation of Weilue - a 3rd century Chinese text by John Hill under "carnelian" and note 12.12 (17)

See also

• List of minerals