- published: 06 Nov 2013
- views: 87141
Turquoise is an opaque, blue-to-green mineral that is a hydrous phosphate of copper and aluminium, with the chemical formula CuAl6(PO4)4(OH)8·4H2O. It is rare and valuable in finer grades and has been prized as a gem and ornamental stone for thousands of years owing to its unique hue. In recent times, turquoise, like most other opaque gems, has been devalued by the introduction of treatments, imitations, and synthetics onto the market.
The substance has been known by many names, but the word turquoise, which dates to the 16th century, is derived from an Old French word for "Turkish", because the mineral was first brought to Europe from Turkey, from the mines in historical Khorasan Province of Persia.Pliny referred to the mineral as callais, the Iranians named it "pirouzeh" and the Aztecs knew it as chalchihuitl.
Even the finest of turquoise is fracturable, reaching a maximum hardness of just under 6, or slightly more than window glass. Characteristically a cryptocrystalline mineral, turquoise almost never forms single crystals and all of its properties are highly variable. Its crystal system is proven to be triclinic via X-ray diffraction testing. With lower hardness comes lower specific gravity (2.60–2.90) and greater porosity: These properties are dependent on grain size. The lustre of turquoise is typically waxy to subvitreous, and transparency is usually opaque, but may be semitranslucent in thin sections. Colour is as variable as the mineral's other properties, ranging from white to a powder blue to a sky blue, and from a blue-green to a yellowish green. The blue is attributed to idiochromatic copper while the green may be the result of either iron impurities (replacing aluminium) or dehydration.
Actors: Mitch Pileggi (actor), Aldo Ray (actor), Rachel Winfree (actress), Robert A. Burns (writer), Robert A. Burns (director), Dennis Hill (actor), Marcos E. González (miscellaneous crew), Ivan Bigley (editor), Terry Evans (actor), Ed Guinn (composer), John Dodson (actor), Cedric Wood (miscellaneous crew), Lin Sutherland (producer), Catherine Molloy (actress), Janis Dickerson (actress),
Plot: At a boarding house, a vicious dog gets loose from his chain and chews up a tenant's ass that was teasing him with a piece of raw meat. As a result, the dog is shot to death. Another tenant, a very high strung book editor, is picked on alot. Soon he starts having dreams that the dog has returned and dead chewed up tenants begin popping up everywhere.
Keywords: accidental-death, accidental-murder, animal-attack, animal-bite, apartment, attack-dog, bald-man, bare-chested-male, basement, blond-manActors: Donald Kerr (actor), Victor Jory (actor), Richard Arlen (actor), Victor Adamson (actor), Paul E. Burns (actor), Edgar Buchanan (actor), Heinie Conklin (actor), Ralph Bucko (actor), Roy Bucko (actor), Nacho Galindo (actor), Chuck Hamilton (actor), Chick Hannan (actor), Sterling Hayden (actor), George Cleveland (actor), Bob Kortman (actor),
Plot: A mysterious outlaw known as the Sidewinder, phantom leader of renegade Ute Indians, terrorizes the people of the Arizona Territory in the 1870s. When rancher Tex McCloud has his place burned out, he vows to find and kill the Sidewinder. McCloud makes a bet with Cavalry troop leader, Lt. Tom Blaine, that he will be the first to unmask the Sidewinder
Keywords: american-indian, cavalry, debt, kidnapping, manhunt, native-american, officer, outlaw, rancher, renegade