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Chromian clinopyroxenes with exsolution textures were found in high-pressure (HP) tremolite schist from the Osayama serpentinite melange in the Chugoku Mountains, Southwestern Japan. Chromian omphacite [jadeite (Jd) 23.3-41.4  diopside (Di) 46.7-60.7  kosmochlor (Ko) 4.5-19.6  aegirine (Ae) &lt;7.0 ] with up to 6.6 wt% Cr 2 O 3  occurs as neoblastic crystals in a foliated tremolite-rich matrix, or as pseudomorphs after relict chromian spinel, and contains irregular-shaped thin lamellae of chromian diopside (Jd 3.8-18.2 Di 72.5- 93.6 Ko 1.1-13.9 Ae &lt;3.4 ). Chromian omphacite contains roughly constant jadeite plus kosmochlor components at 38.2-51.6 mol%; this is equivalent to the jadeite component of ordered P2/n omphacite. Systematic analyses of coexisting chromian pyroxenes yield a clear immiscibility gap between “omphacite” and “diopside.” The compositional gap becomes much narrower with increasing Ko component; addition of only 10 mol% Ko component narrows the omphacite-diopside gap by an order of magnitude. Such an effect is similar to, but more effective than, the introduction of Fe 3+  on the omphacite-diopside immiscibility gap.

american mineralogist

Coexisting chromian omphacite and diopside in tremolite schist from the Chugoku Mountains, SW Japan: The effect of Cr on the omphacite-diopside immiscibility gap