Quartz pseudomorph after calcite

A unique specimen showing alternation of developing of quartz after calcite pseudomorph. On the top of steep scalenohedron calcite crystals, were crystallized two thin layers of small quartz crystals. Due to pulsation character of the solutions, between two quartz layers were developed the second generation of calcite. On the top of the first quartz layer, start developing of thin quartz crystals lately cemented in a calcite aggregate. In the end, of the process, all calcite crystals were dissolved and stay just the cast of quartz