1.4" White Feldspar and Siderite Crystals on Black Aegirine - Malawi

White Feldspar and Siderite Crystals on Black Aegirine - Malawi #348746

This is a 1.4" wide mineral specimen composed of black-green aegirine, brown siderite crystals, and white feldspar. It was collected from the Southern region of Malawi, Africa. The specimen is accompanied by the pictured acrylic display base and mineral tack.

Aegirine is a sodium iron silicate with the chemical formula NaFeSi2O6. It is a member of the pyroxene group and it shares the same crystal structure as augite, but a different chemical composition. It typically forms long, slender crystals that can bear reddish-black, brown, black or greenish colorations.

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