Others, however, are cognate, and represent accumulations of plagioclase from their host magmas. Anorthosite is an almost monomineralic, feldspathic rock with a great variety of industrial applications (Table 1). Anorthosite massifs are known to host important ore depos-its such as ilmenite and are, in many cases, excellent sources for high-quality rock aggregate and also for dimension-stone. The exploitation of anorthosite for industrial mineral Two trends in anorthosites are caused by two varieties of anorthosite: one type with a characteristic mineralogy dominated by plagioclase plus pyroxene and another type dominated by plagioclase plus oxide minerals and apatite. Anorthosite is an igneous monomineralic rock that is composed of plagioclase feldspar (over 90% of the rock is composed of this mineral).

(A) Amphibole + L. D. Ashwal, 1993. Anorthosites. Minerals and Rocks Series Volume 21. xix + 422 pp. Berlin, Heidelberg, New York, London, Paris, Tokyo, Hong Kong: Lunar Rocks – Breccias. Pieces of Apollo 16 anorthosite sample 60025.

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.

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. Rock densities can provide valuable information on modes, especially where plagioclase and a mafic phase are the dominant minerals, as shown by Morse (1979a) for troctolites in the Kiglapait intrusion and by Cawthorn & Spies for pyroxenite to anorthosite packages in the Critical Zone of the Bushveld Complex. 2020-02-21 · 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). The Majoqqap Qaava anorthosite deposit is located 125 km southeast of Greenland’s capital Nuuk on the southwest coast only 12 km from the ice-free coast of Qeqertarsuatsiaat Kangerdluat (Fiskenæs Fjord).

You can find the explanation on the plagioclase feldspar page. Anorthite weathers quite readily, so it’s not terribly abundant on Earth. Anorthosite is typically a coarse-grained intrusive igneous rock with color varies between white, yellowish to brown, shades of gray, blush, and smoky pigment.

The Majoqqap Qaava anorthosite deposit is located 125 km southeast of Greenland’s capital Nuuk on the southwest coast only 12 km from the ice-free coast of Qeqertarsuatsiaat Kangerdluat (Fiskenæs Fjord). The open pit mine will extract raw anorthosite, comprising the feldspar mineral Bytownite.
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The AlSiCal project aims at developing an innovative technology to reduce the environmental impact of producing alumina, silica and calcium carbonate by using alternative mineral resources. Anorthosite is a mineral primarily used in fiberglass, Whether new mines will open depends entirely on economic forces beyond Greenland’s control, the Mining Ministry underscored in an overview compiled in response to an inquiry from a member of the national assembly. 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.
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Anorthosites. Minerals and Rocks Series Volume 21. xix + 422 pp. Berlin, Heidelberg, New York, London, Paris, Tokyo, Hong Kong: Lunar Rocks – Breccias.

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Consisting of more than ninety percent plagioclase feldspar. This rock type forms batholitic complexes of pre-cambrian and older ages. The mineralogy of Anorthosite is over 90% plagioclase feldspar of the Labradorite to Bytownite composition. Anorthosite Thin Sections (cont.) 2.2 Secondary Minerals Quartz. Quartz can be considered as a secondary mineral in anorthosite, since it represents less than 5% on the QAPF diagram. Anorthosite is a plutonic igneous rock, primarily consisting of plagioclase feldspars with no more than 10% of mafic components such as ilmenite, olivene, magnetite or pyroxene. Anorthosites are typically gray or bluish, and are rather course grained.