Mafic minerals in this clast (low-Ca pyroxene with mg' 52 and olivine with Fo 41) have very low mg' compared to most lunar anorthosites described before the

2019-05-25

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. The fine grained, nearly mono mineral composition and light color anorthosite resemble both marble and quartzite in hand specimen. If the quantity of pyroxene increases in anorthosite, the rock grades into gabbro and vice-a-versa. The most common lithic clasts are basalts, gabbros, and orthopyroxenites, while dunites are minor and anorthosites are rare. The most common mineral clasts are centimeter-sized orthopyroxene and olivine fragments, while millimeter-sized plagioclase fragments are less common. Mineralogy and Cryptic Layering of the Kunene Anorthosite Complex of SW Angola and Namibia.

Anorthosite minerals

Looking up on the roadcut, you should take note of a dark band of gabbroic rock and other dark minerals cutting through the white anorthosite. (2) You can walk along the highway (carefully) or drive your car about 0.2 miles south to the turnout for the next waypoint on the west side of the highway. In addition to huge volumes of pure anorthosite, the typical massif anorthosite suite contains minor facies with larger proportions of mafic silicates, Fe-Ti oxides and apatite. Extreme concentrations of these minerals give rise to minor ultramafic rocks, as well as the ilmenite-magnetite ore deposits 0003-004)v82t0r02-0014$02.00 14 Anorthosite / ænˈɔːrθəsaɪt / is a phaneritic, intrusive igneous rock characterized by its composition: mostly plagioclase feldspar (90–100%), with a minimal mafic component (0–10%). Pyroxene, ilmenite, magnetite, and olivine are the mafic minerals most commonly present. Anorthosite is an igneous monomineralic rock that is composed of plagioclase feldspar (over 90% of the rock is composed of this mineral).

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December 23, 2014 New 2016 reference added. Moon's Pink Mineral--- Remote sensing detections of pink spinel anorthosite are compared with sample analyses …

The name is from anorthose, an old name for triclinic Anorthosite is a highly felsic (>90% plagioclase, <10% mafic minerals) non-volcanic igneous rock which peculiar composition requires very specific formation processes. On Earth, anorthosite is a rare rock found mostly in plutonic rocks in continental areas sharing locations with granitoid rocks. From Earth, lunar anorthosite is visible as the light-colored, highly reflective parts of the Moon’s surface known as the lunar highlands.

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The exploitation of anorthosite for industrial mineral 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. Anorthite is the calcium endmember of the plagioclase feldspar mineral series. The chemical formula of pure anorthite is CaAl2Si2O8. Anorthite is found in mafic igneous rocks.

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. 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.
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About Anorthosite Hide A coarse-grained crystalline rock consisting mostly of calcic plagioclase (>90%, usually labradorite) with <10% mafics.

Anorthite belongs to the Plagioclase Feldspar group, an isomorphous solid solution series. Albite is one end member, containing sodium and no calcium. The other end member, Anorthite, contains calcium and no sodium.
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Strictly speaking, the name “anorthosite” is applied to a rock composed of 90 to 100 of calcium-rich plagioclase feldspar and small amounts of high temperature minerals like pyroxene, olivine, magnetite (Fe3O4) or ilmenite (FeTiO3). Feldspar is a very common mineral and occurs in virtually all igneous rocks, but rocks containing 90%+ calcium feldspar are less common.

Most anorthosite plutons are very coarse grained; that is, the individual plagioclase crystals and the accompanying mafic mineral are more than a few centimetres long. 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.

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Anorthite is the light mineral in this hand sample. Scanning electron micrograph of anorthite. Anorthite in Thin Section Thin Section GigaPans. Anorthite in plane polars Anorthite in crossed polars. Anorthite, PPL Anorthite, Plane Polars. Anorthite in plane polarized light.

Scanning electron micrograph of anorthite. Anorthite in Thin Section Thin Section GigaPans. Anorthite in plane polars Anorthite in crossed polars. Anorthite, PPL Anorthite, Plane Polars. Anorthite in plane polarized light. From Earth, lunar anorthosite is visible as the light-colored, highly reflective parts of the Moon’s surface known as the lunar highlands. These are the Moon’s oldest rocks—more than 4 billion years old—and covered the young Moon’s entire surface before its crust was pummeled and broken up … The rock type of Dushan jade belongs to zoisitized anorthosite.