Calcite pseudomorph after Alstonite

Reference: 449

An unusual pseudomorph of alstonite where the alstonite has been replaced by calcite whereas barite is the more common replacement mineral. The specimen is a 'floater' completely covered with small sphalerite crystals and on two sides a subsequent  liberal deposition of alstonite crystals which  have then been replaced by small calcite crystals but retained the alstonite form.

Formula: Calcite CaCO_3; Alstonite BaCa(CO₃)₂

Status: Sold

Dimensions: 85x45x50mm

Size: Small Cabinet (S)