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Orthopyroxene, any of a series of common silicate minerals in the pyroxene family. Orthopyroxenes typically occur as fibrous or lamellar (thin-plated) green masses in igneous and metamorphic rocks and in meteorites.
- The Editors of Encyclopaedia Britannica
Pyroxenes are the most common single-chain silicate minerals. (The only other important group of single-chain silicates, the pyroxenoids, are much less common.) Their structure consists of parallel chains of negatively-charged silica tetrahedra bonded together by metal cations. In other words, each silicon ion in a pyroxene crystal is ...
Aug 27, 2021 · Water contents as measured by SIMS range from 68 ± 7 to 261 ± 11 µg/g H2O and correlate well with Al2O3 contents (r = 0.80) and Cr#s (r. = -0.89). We also describe in detail an optimized strategy, employing both SIMS and FTIR, for quantifying structural water in highly altered samples such as abyssal peridotite.
- Kirsten T. Wenzel, Michael Wiedenbeck, Jürgen Gose, Alexander Rocholl, Esther Schmädicke
- 2021
Jan 19, 2007 · The water solubility in both olivine and Al-free orthopyroxene is quite comparable and increases with pressure and temperature ( 7 – 9, 12 ). However, aluminum is known to greatly enhance water solubility in orthopyroxene, and at high Al contents, water in orthopyroxene may dominate the water budget in the mantle.
- Katrin Mierdel, Hans Keppler, Hans Keppler, Joseph R. Smyth, Joseph R. Smyth, Falko Langenhorst, Fal...
- 2007
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orthopyroxene. wollastonite. rhodonite. aegirine. pyroxene, any of a group of important rock-forming silicate minerals of variable composition, among which calcium-, magnesium-, and iron-rich varieties predominate. General considerations. Pyroxenes are the most significant and abundant group of rock-forming ferromagnesian silicates.
Water contents of nominally anhydrous orthopyroxenes from oceanic peridotites determined by SIMS and FTIR. Kirsten T. Wenzel1 · Michael Wiedenbeck2 · Jürgen Gose1 · Alexander Rocholl2 · Esther Schmädicke1. Received: 12 January 2021 / Accepted: 19 July 2021 / Published online: 27 August 2021 The Author(s) 2021. Abstract.
Orthopyroxene is the most characteristic and important ferromagnesian mineral of the rocks of the charnockite series and is a typical mineral of the granulite facies of regional metamorphism. It is also produced in medium-grade, thermally metamorphosed, argiliaceous rock by the breakdown of chlorite .
