Acid Mine Drainage (AMD) Acidic water discharged from a mining operation. The acid is usually produced by the reaction of sulfide minerals newly exposed to oxygen during the mining process. The acid waters usually carry dissolved metals which precipitate downstream as the acid is diluted by other water sources. The acid is neutralized by the dilution and the water is unable to carry the dissolved metal ions. Mines and mines are the typical sources of acid mine drainage. Today, active mines are required to have treatment systems that prevent the release of acid waters.
Abandoned mines are typically the source of acid discharge and can continue to produce acid discharge for decades without remediation. The photo shows a seep draining mine tailings along Silver Creek, near Park City, Utah. Adularescence An optical phenomenon that defines the gem known as 'moonstone.' Adularescence is a soft glow of light that floats just under the surface of a polished or under the smooth surface of a material. This floating glow of light will move within the stone as the angle of incident light is changed, as the position of the observer's eye is moved, or as the stone is moved under the light.
Adularescence is observed in some semi-translucent to transparent and is caused by light entering the material and reflecting from molecular interfaces within the stone. Associated Gas Natural gas that is found in a reservoir with crude oil. The gas may be in a free gas cap above the oil within the reservoir structure because of its lighter density, or, the gas might be dissolved within the oil and come out of solution when the pressure is reduced. Associated gas is often flared (burned) when oil is produced because a collection and distribution system is not available to transport the gas to market. Flaring is a waste of a resource, a cause of pollution, and a contribution to global warming. Contrast with unassociated gas.
Geology Dictionary Minerals
Aventurescence An optical phenomenon that is seen as a flash of light as a is moved under a source of incident light. It is caused when many tiny platelet-shaped inclusions of a reflective mineral such as mica or or are aligned with a common orientation within the gem material. Light entering the stone travels until it encounters one of these platelets and is then reflected. Because the platelets share a common orientation, they all reflect simultaneously and produce a quick flash of light as the stone is moved under the source of incident light. Reflections can also be seen if the light source is moved or the eye of the observer is moved. Aventurescence is the defining phenomenon of the known as.
It is also seen in and other materials. Is a gem material born about 15 million years ago when a pair of asteroids struck Europe. How to write a simple program.
Are creatures that have adapted to a permanent life in the darkness of a cave. Is the third hardest mineral. It is also the mineral of ruby and sapphire. Are moving masses of loose mud, sand, soil, rock and water. Geologists are beer experts and should know about this rock. Is a metamorphic rock with properties that make it suitable for a variety of projects.
The second most common volcanic landscape feature on Earth. tiny gems that ants haul to the surface and discard on their anthill.
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