Blue Aventurine Rosary Bracelet Crucifix - Miraculous Medal:Antique Gold Agate is a variety of

Agate is a variety of chalcedony

The chatoyancy of the stone is caused by altered amphibole (an inosilicate) fibers that have over time become limonite

These lustrous metallic tints

Tiger Eye is especially common in South Africa

and crackled clear color

Blue Aventurine Rosary Bracelet Crucifix - Miraculous Medal:Antique Gold Agate is a variety ofAventurine is a form of quartz, characterized by its translucency and the presence of platy mineral inclusions that give a shimmering or glistening effect. This shimmering effect is called aventurescence. Chrome bearing fuchsite (a variety of muscovite mica) is the classic inclusion, and gives a silvery green or blue sheen. These blue aventurine beads course and it ranges from a light blue through to a quite strong blue color.