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Diopside - Hedenbergite
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(CLINOPYROXENES) Ca(Mg,Fe)[Si2O6]
Crystal system: Monoclinic
Refractive index: 1.664-1.751
Birefringence: 0.031-0.024
Cleavage: 2 good, 87o
Twinning: simple and multiple common
Colour in PPL: pale green, yellow-green, brownish green
Pleochroism: rare very weak
Relief: high
Distinction: from orthopyroxenes by lower birefringence and straight extinction of latter
Occurrence: metamorphic rocks, particularly thermally-metamorphosed calcium-rich sediments, some igneous rocks
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