Obsidian rock is a type of extrusive igneous rock. Obsidian rocks look like a dark glass and are formed as a result of fast cooling of silica-rich lava. Obsidian has a dark color just like mafic rocks such as basalt, its structure is extremely felsic.
For a layperson, obsidian rock resembles a smoky quartz in look and color. Nevertheless, lots of houses dependant on a crystal structure are absent or modified in obsidian due to that it lacks any crystal stucture of its own. The piezoelectric and optical residential or commercial properties in quartz are hence missing out on in obsidian. Obsidian’s color is more consistently dispersed, while smoky quartz normally has a zoned or splotchy circulation to its color. Like all glass, obsidian breaks with a characteristic conchoidal fracture and may have been polished to establish early mirrors.
Obsidian is utilized in making surgical blades, crystal recovery, gemstones and ornamental application. Archaeological studies found proofs regarding usage of these rocks as cutting tools and weapons in ancient times. The cutting edge of well crafted obsidian blades are as great as high quality surgical steel scalpels. The cutting edge of an obsidian blade is even throghout the length (unlike steel and metallic blade), therefore giving smooth cuts. It was highly valued in certain Stone Age cultures due to the fact that it can be fractured to produce arrow heads or sharp blades. Obsidian is discovered in parts of United states, Mexico, Canada, Argentina, Kenya, Italy, Greece and Iceland.
Obsidian is an igneous rock that forms. The outcome is a rock that cooled so quickly, crystals did not get an opportunity to form. Obsidian is a volcanic glass with a smooth and uniform structure. Obsidian is an igneous rock that forms when molten rock item cools so rapidly that atoms are not able to organize themselves into a crystalline structure. As a “glass,” obsidian is chemically unstable. At these areas, the condensation treatment forms radial clusters of white or gray cristobalite crystals within the obsidian. When cut and polished, these specimens are referred to as “snowflake obsidian” (see images).
Seldom, obsidian has a metal or rainbowlike “sheen” activated by light reflecting from minute additions of mineral crystals, rock particles, or gas. These colored specimens are called “rainbow obsidian,” “golden obsidian,” or “silver obsidian,” depending upon the color of the shine or iridescence. These specimens are actually preferable for the manufacture of fashion jewelry.
Numerous obsidians have a structure much like rhyolite and granite. Rhyolites and granites can form from the same lava as obsidian and are often geographically associated to the obsidian. Obsidian is found in great deals of places worldwide. It is restricted to areas of geologically current volcanic activity. Obsidian older than a few million years is unusual since the glassy rock is rapidly damaged or altered by weathering, heat, or other procedures.
In the United States it is not found east of the Mississippi River, as there is no geologically current volcanic activity there. In the western United States it is found at numerous locations in Arizona, California, Idaho, Nevada, New Mexico, Oregon, Washington, and Wyoming. Lots of obsidian made use of in the jewelry trade is produced in the United States.
Appealing Obsidian Rock Facts:
– Different series of obsidian rock get their names from their appearance.
The look of obsidian is based upon the chemical structure of the lava that cooled to make the rock.
– Obsidian is also called “nature’s glass” since of its glassy look.
– Seventy percent of obsidian rock is made from silica.
– Obsidian can simply form near active volcanoes.
– Often obsidian is emerged directly from a volcano.
– The best obsidian is formed underground near a volcanic vent because those rocks will have limited pollutants.
– Obsidian blood circulations are so slow that often other obsidian blood circulations will happen on top of each other triggering a spotted look in the obsidian rock.
– Although most rocks that form in the Earth’s crust are older, obsidian is hardly ever older than 20 million years of ages which is young for a rock.
– Obsidian goes through a procedure called devitrification whereby it turns from glass to a rock.
– Obsidian is normally utilized throughout surgeries because it is often sharper than traditional surgical tools.
– Obsidian is utilized as a gems in valuable fashion jewelry.