Editing Augite (section)

==Characteristics==
[[File:Augite-54563.jpg|thumb|upright|left|Euhedral crystal of augite from [[Teide]] (4.4 x 3.0 x 2.3 cm)]]
Augite is a [[solid solution]] in the [[pyroxene]] group. [[Diopside]] and [[hedenbergite]] are important endmembers in augite, but augite can also contain significant [[aluminium]], [[titanium]], and [[sodium]] and other elements. The calcium content of augite is limited by a [[miscibility gap]] between it and [[pigeonite]] and [[orthopyroxene]]: when occurring with either of these other pyroxenes, the calcium content of augite is a function of temperature and pressure, but mostly of temperature, and so can be useful in reconstructing temperature histories of rocks. With declining temperature, augite may exsolve lamellae of pigeonite and/or orthopyroxene. There is also a miscibility gap between augite and [[omphacite]], but this gap occurs at higher temperatures. There are no industrial or economic uses for this mineral.<ref name="kleiin-hurlbut-1993">{{cite book |last1=Klein |first1=Cornelius |last2=Hurlbut |first2=Cornelius S. Jr. |title=Manual of mineralogy : (after James D. Dana) |date=1993 |publisher=Wiley |location=New York |isbn=047157452X |edition=21st |pages=481–482}}</ref><ref name="nesse-2000">{{cite book |last1=Nesse |first1=William D. |title=Introduction to mineralogy |date=2000 |publisher=Oxford University Press |location=New York |isbn=9780195106916 |pages=268–269}}</ref>