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Citation bot (talk | contribs) Add: hdl, s2cid, bibcode, doi, issue. | Use this bot. Report bugs. | Suggested by BorgQueen | Category:Minerals in space group 13 | #UCB_Category 3/16 |
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| caption = Picture of pieces of [[eclogite]] (type of rock) from the Western Gneiss Region in Norway. The rock contains the minerals omphacite (green), [[pyrope]]-garnet (red), [[quartz]] (milky), [[kyanite]] (blue) and some [[phengite]] (golden white).
| formula = (Ca,Na)(Mg,Fe<sup>2+</sup>,Al)Si<sub>2</sub>O<sub>6</sub>
| IMAsymbol = Omp<ref>{{Cite journal|last=Warr|first=L.N.|date=2021|title=IMA–CNMNC approved mineral symbols|url=https://www.cambridge.org/core/journals/mineralogical-magazine/article/imacnmnc-approved-mineral-symbols/62311F45ED37831D78603C6E6B25EE0A|journal=Mineralogical Magazine|volume=85|issue=3 |pages=291–320|doi=10.1180/mgm.2021.43 |bibcode=2021MinM...85..291W |s2cid=235729616 }}</ref>
| molweight =
| strunz = 9.DA.20
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== Chemical composition ==
Omphacite is the solid solution of Fe-bearing diopside (CaMgSi<sub>2</sub>O<sub>6</sub>) and jadeite (NaAlSi<sub>2</sub>O<sub>6</sub>). Depending on how much the coupled substitution of (Na, Al)-(Mg-Fe, Ca) happens, the [[chemical composition]] of omphacite varies continuously from pure diopside to pure jadeite.<ref name=":1" /> Due to the relatively small radius of (Na, Al) atoms, the [[Unit Cell|unit cell]] volume linearly decreases as jadeite component increases.<ref name=":2">{{Cite journal|last1=Pandolfo|first1=Francesco|last2=Cámara|first2=Fernando|last3=Domeneghetti|first3=M. Chiara|last4=Alvaro|first4=Matteo|last5=Nestola|first5=Fabrizio|last6=Karato|first6=Shun-Ichiro|last7=Amulele|first7=George|date=2015|title=Volume thermal expansion along the jadeite–diopside join|url=https://doi.org/10.1007/s00269-014-0694-9|journal=Physics and Chemistry of Minerals|language=en|volume=42|issue=1|pages=1–14|doi=10.1007/s00269-014-0694-9|bibcode=2015PCM....42....1P|hdl=2318/153763 |s2cid=96677363|issn=1432-2021}}</ref> In addition, the coupled substitution also stiffens the crystals. The [[Bulk modulus|bulk]] and [[Shear modulus|shear]] modulus linearly increases as jadeite component increases.<ref name=":1" />
== Space Group ==
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