Anorthite. Anorthite is the calcic end member of the plagioclase feldspar series. In thin section, plagioclase feldspar grains often look like they’re sprinkled with dirt (PPL) or tiny confetti (XPL). You can find the explanation on the plagioclase feldspar page. Anorthite weathers quite readily, so it’s not terribly abundant on Earth.
Mineral salts are substances extracted from bodies of water and below the Earth's surface. Some examples of mineral salts include sodium, chlorine, calcium, phosphate, magnesium, sulfur, potassium, and phosphorus. Minerals are important to
The mineral content of Gabbro includes Augite, Olivine, Plagioclase, Pyroxene and mineral content of Anorthosite includes Amphibole, Clinopyroxene, Ilmenite, Magnetite, Olivine, Orthopyroxene. You can also check out the list of all Igneous Rocks. Unlike the barren anorthosite with unzoned plagioclase, the mineralized anorthosites of the “South Reef” are characterized by pronounced zonation of cumulus plagioclase, showing distinct brown rims that have a similar compositions to plagioclase rims from the overlying cumulate [ 9 ]. poor in mafic minerals and may represent anorthosite excavated from the Moon’s upper crust. However, detailed assessment of the mineralogy of these anorthosites was prohibited because the available spectroscopic data sets did not identify the diagnostic plagioclase absorption feature near 1250nm.
anorthosites and associated rocks from eight Proterozoic massif anorthosite complexes of India, North America and Norway indicates marked similarities in mineralogy and chemistry among similar rock types. The anorthosite and mafic-leucomafic rocks (e.g., leuconorite, leucogabbro, The rock type of Dushan jade belongs to zoisitized anorthosite. Anorthite, the major mineral of Philippines rock, belongs to the plagioclase isomorphous series. Diopside is the minor mineral with the highest content in Philippines rock and was altered by tremolitization. Our specific goals are (1) to map the distribution of discrete crystalline anorthosite exposures throughout the Orientale basin, as indicated by the presence of a 1250 nm absorption in Moon Mineralogy Mapper (M 3) spectra, and (2) to estimate the “purity,” or plagioclase abundance, of the various anorthosite exposures by comparing the relative strengths of the plagioclase and mafic mineral 2012-12-01 Anorthosite. Not to be confused with Anorthite.
Anorthosite is by definition an igneous rock consisting of 90-100% plagioclase feldspar. When the amount of mafic minerals exceeds 10 % the name leucogabbro or anorthositic gabbro (alternatively -norite) is commonly used, depending on the nature of the pyroxene.
You can also check out the list of all Igneous Rocks. When we Mafic–ultramafic intrusions comagmatic with Proterozoic massif-type anorthosites can provide insights into the parental magma from which large volumes of hyper-feldspathic rocks are produced. Recent deep drilling has unveiled a large olivine–Ti-magnetite-rich layered intrusion (named Dawusunangou) beneath the Damiao massif-type anorthosite complex in the North China Craton. The layered About Anorthosite Hide A coarse-grained crystalline rock consisting mostly of calcic plagioclase (>90%, usually labradorite) with <10% mafics.
Norwegian anorthosite. Explore Jeannius Designs' photos on Flickr. Jeannius Designs has uploaded 3259 photos to Flickr. Minerals And Gemstones Crystals Minerals
All anorthosites found on Earth consist of coarse crystals, but some samples of the rock taken from the Moon are finely crystalline. Most anorthosites formed during Precambrian times.
Hudson owns 33% of the operating White Mountain (Qaqortorsuaq) anorthosite (calcium feldspar) mine in Greenland and 100% of the Sarfartoq carbonatite exploration project which hosts an advanced rare earth element project rich in neodymium, and a high grade niobium project. Stillwater Anorthosite contains numerous sulfides contianing PGE's (Platinum Ground Elements) Stillwater Anorthosite Mineral # 710 another view Click on the mineral to enlarge the specimen, in the center and going down from there you can see what looks like pyrite.
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Japan produces excellent crystals thinly coated with a dark layer of lava at Miyaki Jima (Miyaki Island), Tokyo Prefecture. Most anorthosite in the western part of the Marcy massif is relatively massive, allowing Davis (1971) to map anorthosite in the St. Regis quadrangle by mafic mineral content. Crosby (1969) attempted to classify anorthosite by mineralogy by marking large areas on outcrops and counting enclosed mineral percentages, but found any simple 6 - Franklin Minerals(Dunn) 7 - Franklin Minerals(Palache) 8 - GeoScienceWorld 9 - Google Images 10 - Google Scholar 11 - Handbook of Mineralogy (MinSocAm) 12 - Handbook of Mineralogy (UofA) 13 - HyperPhysics 14 - MinDAT 15 - Mineral and Gemstone Kingdom 16 - Mineralienatlas (Deutsch) 17 - Online Mineral Museum 18 - QUT Mineral Atlas 19 - Ruff.Info Anorthosite - A core 3.5cm wide of the rock type called "anorthosite", which are composed mostly of calcic plagioclase with also some mafic rock. A considerable amount of rocks brought back by the Apollo missions were anorthosite.
The composition of Gabbro and Anorthosite consists of mineral content and compound content. The mineral content of Gabbro includes Augite, Olivine, Plagioclase, Pyroxene and mineral content of Anorthosite includes Amphibole, Clinopyroxene, Ilmenite, Magnetite, Olivine, Orthopyroxene. You can also check out the list of all Igneous Rocks.
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Anorthosite - A core 3.5cm wide of the rock type called "anorthosite", which are composed mostly of calcic plagioclase with also some mafic rock. A considerable amount of rocks brought back by the Apollo missions were anorthosite. It is not a common rock type and is found in few places on Earth, but common on the Moon's surface. . This and many more mineral specimens are available for sale at
About Anorthosite Hide A coarse-grained crystalline rock consisting mostly of calcic plagioclase (>90%, usually labradorite) with <10% mafics. The mafic mineral may be clinopyroxene, orthopyroxene, olivine, or, more rarely, amphibole.