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Smoky quartz usually has a splotchy or zoned distribution to its color while Obsidian's color is more uniformly distributed.Obsidian is mineral-like, but not a true mineral because as a glass it is not crystalline; in addition, its composition is too complex to comprise a single mineral. Though obsidian is usually dark in color similar to mafic rocks such as basalt, obsidian's composition is extremely felsic.

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This breakdown of obsidian is accelerated by the presence of water.Obsidian is the result of volcanic lava coming in contact with water.Often the lava pours into a lake or ocean and is cooled quickly.Obsidian consists mainly of Si O2 (silicon dioxide), usually 70% or more.Crystalline rocks with obsidian's composition include granite and rhyolite.This process produces a glassy texture in the resulting rock.Iron and magnesium give the obsidian a dark green to black color. Obsidian can contain small bubbles of air that are aligned along layers created as the molten rock was flowing just before being cooled.However, many properties dependant on a crystal structure are altered or absent in obsidian because it lacks any crystal structure of its own.The piezoelectric and optical properties in quartz are thus absent in obsidian.Plinths for audio turntables have been made of obsidian since the 1970s; e.g. Obsidian is formed when volcanic lava comes into contact with water; this forces it to cool so quickly that it doesn?t have time to crystallize resulting in a stone with a shiny, glassy texture.

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  1. Hydration definition, any of a class of compounds containing chemically combined water. In the case of some hydrates, as washing soda, Na 2 CO 3 ⋅10H 2 O, the water.

  2. Define obsidian hydration dating. DEFINITION A method of dating in which the age of an obsidian artifact is established by search dating profiles by name the.

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