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A rollover image of an augite crystal at 5x magnification. Note the 90 degree cleavage, though imperfect. In cross polarized light, notice high birefringence. Photomicrograph from K-84. Rollover image of an augite crystal in SIC-10. High relief and imperfect 90 degree cleavage. Birefringence=.014, low for augite. Magnification is 5x.
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The SLNR matrix typically comprises cumulus orthopyroxene and plagioclase with interstitial augite, phlogopite, sulfide, and less common granophyric intergrowths of K-feldpsar and quartz.The orthopyroxene has a cumulus texture and comprises 30%–50% of the rock, and plagioclase laths comprise 30%–40% of the rock; these rocks range in …
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Pyroxene Group, Clinopyroxene Subgroup.In the Ca-Fe-Mg (diopside-hedenbergite-augite) quadrilateral, the ideal structural formula is M2M1[Si 2 O 6], where M2 is a distorted octahedral site which preferentially accepts large cations such as alkaline earth/alkali atoms (Ca, but may accept transition metals) and where M1 is a smaller regular octahedral site …
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Augite: Quick Facts and Characteristics Some quick facts for Augite: Transparency: Augite can be opaque or translucent. Crystallography: In terms of crystallography, augite is monoclinic. Luster: In terms of luster, augite can be dull or vitreous (glassy). Streak: Augite streaks colorless, green, green colorless or light green. Hardness: Augite's hardness …
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Augite is a basic silicate mineral with high content of iron and magnesium, a so-called "ferromagnesian" mineral of the pyroxene grouping. This identifies it as a high-crystallization-temperature dark silicate, formed at early stages of the Bowen reaction series. Augite is often found as crystals in basalt. This sample of augite is about 18cm ...
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