Blue Peruvian Opal naturally occurs with swirling patterns of deep blues, blue-greens and greens swirled with yellow-green, rust, brown and orange. It is highly prized for its beautiful combinations of...
Zoisite, first known as saualpite, after its type locality, is a calcium aluminium hydroxy sorosilicate belonging to the epidote group of minerals. Zoisite occurs as prismatic, orthorhombic crystals or in...