unusual patterns of the polished malachite gemstone. abstract green concentric structures

abstract aciniform amulet arrangement assemblage background botryoidal cabochon carbonate circles clustered concentration concentric cooper copper crust earthy fractal gemstone geology green hardness jewelry luster lustre malachite marbling masses mineral mineralogy natural ore ornament ornamental pattern pigment polished rings shape shiny silky solid stalagmitic stone structure surface texture unusual wavy