Kosmochlor is a rare chromium sodium clinopyroxene with the chemical formula NaCr3+Si2O6.

The name is from German kosmisch, for its occurrence in meteorites, and the Greek chlor, for green.

[2] It occurs as a major constituent of some jadeitites and as an accessory mineral of some iron meteorites.

Associated minerals include cliftonite (graphite), chromian diopside, troilite at Toluca; daubreelite, krinovite, roedderite, high albite, richterite, chromite (Canyon Diablo); and jadeite, chromite and chlorite (Burma).

This article about a specific silicate mineral is a stub.