Shared Properties:
Crystal system: Monoclinic
Cleavage: 2 good, 87o
Twinning: simple and multiple common
Colour in PPL: colourless, pale green, yellow-green, brownish green
Pleochroism: rare very weak
Relief: high
Clinopyroxenes are often identified and described in pottery thin sections as a group rather than trying to identifying specific minerals
Individual mineral identifications would require an accurate measurement of refractive indices and birefringence (more than what is usually required for the purpose of ceramic petrology)
Minerals in the Clinopyroxene group are:
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Clinopyroxene - Cross polarized light - Puebla - Mexico
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