This model is supported by the composition and phenocryst assemblage of model for the origin of the gabbro-anorthosite-syenite-potassic granite suite. – Prec

Pictures, Composition, Geology, Occurrence, and Uses of Anorthosite. James ErjavecRocks · Crystal FormsCredit: Copyright: Bernardo Cesare, Crystals of the

and anorthosites (comprising the iridescent variety of labradorite, known as “spectrolite”). relations in calcic plagioclaseA subsolidus temperature-composition diagram for Anorthosite country rocks near the fissure vents of an andesitic resurgent Influence of different types of fine aggregate on concrete composition Claus gneiss Hellevik, anorthosite Fjordstein, Anorthosite/gabbro Årdal, sand/gravel large range of temperatures, pressures and chemical compositions, and thus, Although the anorthosite units were completely homogenous in regards to its Anorthosite is a plutonic rock which is composed of plagioclase (>90%). Definition, Classification, Composition, Colors, Geology, and Occurrence of Trachyte. Sr-Isotope Compositions and Trace Element Concentrations in Plagioclase crystallization sequence of an anorthosite-norite intrusion, Älgön SW Sweden.

Anorthosite composition

Bulk compositions ofanorthositic par-ticles, determined by averaging the results of seven to ten randomly placed, defocused-beam, electron microprobe analyses. a, Anorthositic gabbro (9-8); b, anorthosite-gabbroic anortho-site (37-1). Percentage, byweight Oxide* a b SiO2 46.0 45.4 TiO2 0.3 tr A1203 27.3 33.8 Cr203 0.2 tr FeO 6.2 2.8 “Anorthosite is not rare on Earth,” Rickman said. It is rare, however, to find the nearly pure, high-calcium type of anorthosite—anorthite—that closely resembles the chemical composition of anorthosite from the Moon. Rocks found within the Stillwater Complex come very close. The composition of Gabbro and Anorthosite consists of mineral content and compound content.

In the IUGS classification, anorthosite contains 0-5% Q, P/(A + P) >90, and M < 10 (M = Mafics). The name is from anorthose, an old name for triclinic feldspars.

L'anorthosite est une roche magmatique de structure phanéritique, composée principalement de feldspath plagioclase (90-100 %), avec 0 à 10 % de composants mafiques tels que le pyroxène, l'ilménite, la magnétite et l'olivine.

Anorthosite regolith sand might be a useful molding material for molten basalt. Production of objects of specific shape and composition will be quite useful.

Stable silicon isotopic compositions of the Lena River and its tributaries: Implications for Lithos , The source of Proterozoic anorthosite and rapakivi granite

AU - Griffin, W. L. AU - Sundvoll, B. AU - Kristmannsdottir, H. PY - 1974. Y1 - 1974. N2 - Plagioclases from massif anorthosites are strongly depleted in Rb and Cs relative to those from anorthosites associated with volcanic rocks, but are enriched in K and REE. Anorthosite Similar in composition to rocks on the moon, anorthosite is a coarse-grained, intrusive igneous rock composed almost entirely of a single mineral—plagioclase feldspar. In Minnesota, anorthosite was intruded into the lowermost lava flows that formed during the opening of the Midcontinent Rift.

Anorthosites occur as fragments or inclusions of widely varying size and shape in many other igneous rock types, ranging in composition from granite to basalt to kimberlite. 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.
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However, there is a gradual decrease in plagioclase content, An content ofplagioclase andXMg of orthopyroxene, and an increasein maﬁc silicates, oxide minerals content, plagioclase incompatible elements and REE from anorthosite– maﬁc-leucomaﬁc rocks to Fe-rich dioritic rocks. clase feldspar and Ca-poor pyroxene. Compositions ranging between noritic anorthosite and anorthositic norite are indicated. [11] The Inner Rook Mountains are markedly different in composition from other units within the Orientale basin [Spudis et al., 1984; Hawke et al., 1991].

The mineral content of Gabbro includes Augite, Olivine, Plagioclase, Pyroxene and mineral content of Anorthosite includes Amphibole, Clinopyroxene, Ilmenite, Magnetite, Olivine, Orthopyroxene. L’anorthosite de Chugwater ne contient pas d’olivine, en général, mais possède l’assemblage augite, pyroxène à faible teneur en Ca, ilménite et magnétite, un plagioclase iridescent de composition An50–56. Dans l’anorthosite de Snow Creek, l’olivine Anorthosite. Calciclasite ⓘ Composition of chromite in the upper chromitite, Muskox layered intrusion, Northwest Territories.
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med tonvikt p5 kvartsinnehSl1 (Mineralogical composition of Swedish soils with the mineral and chemical compositions. Phys. 234 Anorthosite. 1.76. 1.67.

Anorthite also refers to plagioclase compositions with more than 90 molecular percent of the anorthite endmember. At 1 atmosphere, anorthite melts at 1553 °C. ANORTHOSITE - Intrusive igneous, plutonic. This rock is composed of calcic plagioclase with less than 10% ferro-magnesium minerals. The plagioclase may be labradorite, bytownite, or anorthite. In the IUGS classification, anorthosite contains 0-5% Q, P/(A + P) >90, and M < 10 (M = Mafics).