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The chain silicate structure of the pyroxenes offers much flexibility in the incorporation of various cations and the names of the pyroxene minerals are primarily defined by their chemical composition. Pyroxene minerals are named according to the chemical species occupying the X (or M2) site, the Y (or M1) site, and the tetrahedral T site.
This image is a derivative work of the following images: Image:Pyrox_names.png licensed with GFDL 2005-12-20T22:46:48Z Angrense 722x467 (6196 Bytes) Diagram of pyroxene names. Source: English version of Wikipedia. Uploaded with derivativeFX
Omphacite is a member of the clinopyroxene group of silicate minerals with formula: (Ca, Na)(Mg, Fe 2+, Al)Si 2 O 6.It is a variably deep to pale green or nearly colorless variety of clinopyroxene.
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The pyroxene pallasite grouplet is a subdivision of the pallasite meteorites (stony-irons). [1] The grouplet is named "pyroxene pallasites" because they are the only pallasites that contain pyroxene. The grouplet was proposed in 1995. [2] It currently has only two members: the Vermillion and Yamato 8451 meteorite.
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A QAPF diagram is a doubled-triangle plot diagram used to classify intrusive igneous rocks based on their mineralogy. The acronym QAPF stands for "Quartz, Alkali feldspar, Plagioclase, Feldspathoid (Foid)", which are the four mineral groups used for classification in a QAPF diagram. The percentages (ratios) of the Q, A, P and F groups are ...