Feldspar - Encyclopedia.com
2018年5月29日 · Feldspar Feldspar is the most common mineral on Earth [1], constituting approximately 60% of the crust . It forms directly from cooling magma and is a major component of granite and most other igneous rocks .
Feldspars - Encyclopedia.com
2018年5月8日 · feldspars The most important group of rock-forming silicate minerals, including the alkali feldspars KAlSi 3 O 8 to NaAlSi 3 O 8 (K-feldspar to albite) and the plagioclase feldspars NaAlSi 3 O 8 to CaAl 2 Si 2 O 8 (albite to anorthite).
Alkali Feldspar - Encyclopedia.com
2018年5月8日 · alkali feldspar A group of silicate minerals that contain the alkali metal elements potassium and sodium. The normal feldspar minerals (including the calcium-bearing varieties) can be plotted on a chemical basis into a triangle which has KAlSi 3 O 8 (potassium feldspar, sanidine, orthoclase (Or), or microcline), NaAlSi 3 O 8 (sodium feldspar, albite, or Ab), and …
Plagioclases - Encyclopedia.com
2018年5月8日 · Plagioclase Plagioclase is a form of the mineral feldspar . All feldspars are crystals of aluminum, oxygen , and silicon , plus a major additive. In the case of plagioclase, the additive is calcium, sodium, or a blend of both. Miscellaneous impurities may also be present.
Granite - Encyclopedia.com
2018年5月8日 · Granite, which makes up 70 – 80% of Earth's crust, is an igneous rock formed of interlocking crystals of quartz, feldspar, mica, and other minerals in lesser quantities. Large masses of granite are a major ingredient of mountain ranges. Granite is a plutonic rock, meaning that it forms deep underground.
Phyllite - Encyclopedia.com
2018年5月9日 · The assemblage of minerals usually present in phyllite is referred to as greenschist facies, and includes chlorite, muscovite, sodium-rich plagioclase feldspar, and a small amount of quartz. Greenschist metamorphism of shales requires moderate amounts of both heating and compression, consistent with the conditions present in accretionary wedges ...
Freshwater and Freshwater Ecosystems | Encyclopedia.com
Freshwater and Freshwater EcosystemsIntroductionFreshwater refers to the water found in lakes, ponds, streams, and any other body of water other than the sea.
Sodium Carbonate - Encyclopedia.com
2018年6月27日 · sodium carbonate, chemical compound, Na2CO3, soluble in water and very slightly soluble in alcohol. Pure sodium carbonate is a white, odorless powder that absorbs moisture from the air, has an alkaline taste, and forms a strongly alkaline water solution.
Sodium Chloride - Encyclopedia.com
2018年6月27日 · Sodium Chloride. Properties. Bonds. Location and processing. Mining. Evaporation. Uses. Resources. Sodium chloride (chemical formula NaCl), known as table salt, rock salt, sea salt, and the mineral halite, is an ionic compound consisting of cube-shaped crystals composed of the elements sodium and chlorine.
Coal Washing - Encyclopedia.com
In some cases, a liquid other than water may be used to achieve this separation. In a heavy medium bath, for example, a mineral such as magnetite or feldspar in finely divided form may be mixed with water, forming a liquid medium whose density is significantly greater than that of …