Agate ( /ˈæɡət/) is a microcrystalline variety of silica, chiefly chalcedony, characterised by its fineness of grain and brightness of color. Although agates may be found in various kinds of rock, they are classically associated with volcanic rocks and can be common in certain metamorphic rocks.
The stone was given its name by Theophrastus, a Greek philosopher and naturalist, who discovered the stone along the shore line of the river Achates (Greek: Ἀχάτης) sometime between the 4th and 3rd centuries BC. Colorful agates and other chalcedonies were obtained over 3,000 years ago from the Achates River, now called Dirillo, in Sicily.
Agate is one of the most common materials used in the art of hardstone carving, and has been recovered at a number of ancient sites, indicating its widespread use in the ancient world; for example, archaeological recovery at the Knossos site on Crete illustrates its role in Bronze Age Minoan culture.
Most agates occur as nodules in volcanic rocks or ancient…
Discover How to Master Skate boarding in a Two Week-Long Class Are you having problems learning how to skateboard? Be taught all of the fundamentals of skateboarding fast in a one-week camp. We will teach you the principles of skateboarding such as how to balance, push, turn, proper foot placement, and how to stop. Irregardless, […]