Chalcedony

Chalcedony is a blue agate. Agate is formed from layers of quartz which usually show varicolored bands. The bands of agate may resemble moss, ribbon, lace or tree branches.

Color
Chalcedony is a blue agate.

Origin
Chalcedony may be found in Africa, Asia, Brazil, Egypt, Germany, India, Italy, Mexico, Nepal, and the United States.