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Aegirine-augite: (Ca,Na)(Mg,Fe++,Fe+++)[Si2O6] Dellaventuraite: NaNa2(Mg2,Mn+++,Li,Ti)Si8O22O2
Comments: View in plane-polarized light of reddish brown dellaventuraite (OPTK) as an overgrowth on purple-gray aegirine-augite (AE-AG) in a matrix of rounded quartz (QZ) with minor rounded (high relief) apatite grains. (AmMin 90:306).
Location: Kajlidongri manganese mine, Jhabua District, Madhya Pradesh, India.
Scale: Picture size 2.5 cm.
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