Onyx is a semi-precious variety of chalcedony quartz, striped in black and white. Among its varieties is the Carnelian onyx,...

Guardian lion statues traditionally stood in front of Chinese imperial palaces, imperial tombs, administrative buildings, temples, residences of...

Ancient enamel art on metal surfaces. This word derives from the French cloison which means division, compartment. Byzantine production...

Charoite is a rare mineral, recently discovered. It is only found, as far as is known, along the river Chary in...