Coal mines and metal mines are the typical sources of acid mine drainage. The top is usually a cap-rock of resistant material. "Gross Acreage" is the entire geographic area under control. The specimen in the photo is a cleavage fragment of plagioclase. Every year in the United States, accidents at abandoned mines and quarries claim numerous lives. Aventurescence is the defining phenomenon of the gem material known as aventurine. The upper portion of a glacier where, over the course of a year, more accumulation occurs than ablation and the mass of glacial ice grows. Mark R. Frank - economic geology, experimental petrology, mineralogy and geochemistry. Amethyst is a transparent variety of quartz that ranges from light lilac to deep purple in color. The written exams must all be taken within a period of one week. Dictionary of Geological Terms - Only $19.99. It consists of a mixture of organics and mineral matter. An acre is a unit of land measure that represents 43,560 square feet or 1/640 of a square mile. These red chrome pyrope garnets are often found on ant hills in parts of the southwestern USA. The photo is of Pavlof Volcano on the Alaska Peninsula, one of the most active volcanoes in North America. The water may or may not flow onto the land surface. The acid waters usually carry dissolved metals which precipitate downstream as the acid is diluted by other water sources. Department receives a $2.18M donation of Moveā„¢ structural analysis and visualization software from Petroleum Experts, Inc. - August 1, 2019; Our 2018 issue of the Geogram is complete and ready for viewing. A geology dictionary that is used regularly is one of the most important tools for developing professional competence. An aquifer that is bounded above and below by impermeable rock or sediment layers. Shown in the image are two faceted tourmalines cut from zoned crystals produced by growth. Click on an underlined word for more information on that subject. The Facts on File Dictionary of Geology and Geophysics. It usually has a yellowish to orangish-brown color but can be white, greenish, bluish or even black. A good dictionary should be on the desk of every geologist and within easy reach. An aquifer that is not overlain by an impermeable rock unit. A fine-grained, extrusive igneous rock composed mainly of plagioclase with other minerals such as hornblende, pyroxene, and biotite. A zone of low strength in the upper mantle defines the top of the asthenosphere. The one on the right is known as "watermelon" for obvious reasons. An optical phenomenon that is seen as a flash of light as a gemstone is moved under a source of incident light. There is no universally agreed upon definition for the word "gemstone." This can be caused by a change in the composition or temperature of the fluid from which the crystal was growing; twinning; or, variations in exposure to heat or radiation. Contrast with unassociated gas. The image shows the Cascades Volcanic Arc of the northwestern United States. This dictionary is compact and inexpensive at only $19.99. An ancient circular scar on Earth's surface produced by the impact of a meteorite or comet. More information. It includes the study of solar system astronomy, geology, oceanography and meteorology. Agricultural geology definition is - the branch of geology that deals with the character and origin of soils, the occurrence of mineral fertilizers, and the behavior of underground water. An atom with a negative charge that has been produced by the gain of one or more electrons. The block above the fault has moved down relative to the block below the fault. Image copyright iStockphoto / Barcin. This dictionary is compact and inexpensive at only $19.99. 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