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Lunar Highland Basalt (gabbroic anorthosite) composition transforms with increasing pressure through assemblages of spinel + clinopyroxene + anorthite, and 

General Anorthite Information : Chemical Formula: CaAl2Si2O8 : Composition: Molecular Weight = 277.41 gm Sodium 0.41 % Na 0.56 % Na 2 O: Calcium 13.72 % Ca 19.20 % CaO: Aluminum 18.97 % Al 35.84 % Al 2 O 3: Silicon 20.75 % Si 44.40 % SiO 2: Oxygen 46.14 % O: 100.00 % 100.00 % = TOTAL OXIDE Anorthosite is often composed of mineral labradorite which is famous for an iridescent effect called labradorescence. You’ll find more in this article: anorthosite and labradorescence . The Moon highlands seem to be composed of anorthosite. Massif anorthosite, including leucogabbro and/or leuconorite, consists of a suite of coarse-grained heterogeneous rocks dominated by intermediate composition plagioclase (An 40–60) with smaller and variable amounts of pyroxenes, oxide minerals, and apatite. Anorthite is the calcium -rich endmember of the plagioclase solid solution series, the other endmember being albite, Na AlSi 3 O 8. Anorthite also refers to plagioclase compositions with more than 90 molecular percent of the anorthite endmember. At 1 atmosphere, anorthite melts at 1553 °C.

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1.2 Composition 1.2.1 Mineral Content Amphibole, Clinopyroxene, Ilmenite, Magnetite, Olivine, Orthopyroxene Anorthosite is an igneous monomineralic rock that is composed of plagioclase feldspar (over 90% of the rock is composed of this mineral). Plagioclase is a very common mineral group, more than half of the Earth’s crust is composed of it. Anorthosites also occur as inclusions in other igneous rocks ranging in composition from kimberlite to basalt to granite. Some can be demonstrated to be xenolithic, and represent fragments of other anorthosite types incorporated into ascending magmas.

The rock here is anorthosite, and is similar in composition to rocks found in the mountains of the Moon. Harris, Outer Hebrides - Wikipedia After crystallization was about 75% complete, less dense anorthositic plagioclase feldspar crystallized and floated, forming an anorthositic crust about 50 km in thickness.

2 dagar sedan · Apollo 16 Anorthosite. Anorthosite is an important rock type of the lunar highlands and probably formed the primitive lunar crust. This sample has been determined to be 4.19 billion years old by the Argon method of dating. This date corresponds to the formation of a large lunar impact basin from which the rock was thrown.

Sixty-one of 1676 lunar rock fragments examined were found to be anorthosites, markedly different in composition, color, and specific gravity from mare basalts 

med tonvikt p5 kvartsinnehSl1 (Mineralogical composition of Swedish soils with the mineral and chemical compositions. Phys. 234 Anorthosite.

This date corresponds to the formation of a large lunar impact basin from which the rock was thrown. The composition of most of the central peaks we analyze is more mafic than classically defined anorthosites with an average noritic anorthosite composition similar to that of the lunar surface. 1 Introduction An anorthositic crust was proposed shortly after the return of lunar samples [ Wood et al., 1970 ]. Bulk composition of the Moon constrained by the conditions of anorthosite crust formation （斜長岩質地殻形成条件から制約する月バルク組成） 酒井 理紗 A basic understanding of inner structure, chemical composition and thermal history for the Moon have been provided from the extensive explorations, including remote Systematic variations of the mineral chemistry of ferroan anorthosite 60025, which is probably a mixture of closely related materials, suggest that lunar anorthosites formed by strong fractional crystallization and near-perfect adcumulate growth, without trapping liquid. The parent liquid for the most primitive samples was saturated with olivine, plagioclase, pigeonite, and chromite, and Several pure anorthosite clasts have been found in the Dhofar samples, and 60015 is an anorthosite with high abundance of plagioclase and uniform composition in comparison with other FAN samples. These anorthosite samples are thought to be identified as pure anorthosite rocks composed of high abundances of igneous plagioclase (>98% plagioclase) or metamorphosed anorthosite from such pure The initial Sr and Nd isotopic compositions (calculated at 1434 Ma) of the analysed blocks indicate that they crystallized from magmas distinctive in composition from those that formed the layered series of the Poe Mountain anorthosite (Scoates & Frost, 1996).
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The mineralogical mode is difficult to determine because of the large grains size of the plagioclase. Mineralogical Mode for 15415 . … The composition of Gabbro and Anorthosite consists of mineral content and compound content.

Lithos , The source of Proterozoic anorthosite and rapakivi granite  SUN, X. Stable silicon isotopic compositions of the Lena River and its tributaries: Lithos , The source of Proterozoic anorthosite and rapakivi granite  mineral composition temperature isotropy/ Anorthosite 1.76 1.68 i t y o f rock from t h e mineral and chemical compositions. P h y s . E a r t h  Basalter av lunaröarna (pyroxen, plagioklas, ilmenit, olivin).
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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. Anorthite is rare on the Earth but abundant on the Moon.

Usually, Archean anorthosites are more Ca-rich than Proterozoic ones (e.g., in the Laramie Mountains, Wyoming, or the Adirondack Mountains, New York), which verifies below. anorthosite (Chatterjee, 1959) is an E-W elongated, “tadpole-shaped”, 250 km2 large massif at the eastern margin of the CGC. It is located between 23°27'48"N and Anorthosite layer numbers are positive and increase upwards in the Upper Zone, and are negative, increasing downward, in the Main Zone. If we rigorously used a density limit of 2·8 g/cm 3 to define anorthosite, then anorthosite layer –17 in Fig. 7a would become split into three anorthosite layers. Applying this principle throughout the core The Snow Creek anorthosite is characterized by a lack of olivine and magnetite and the presence of iridescent plagioclase of composition An47 to An56; it is commonly quartz-bearing.