Agates usually occur as nodules in volcanic rocks. These develop as each agate fills the cavity of its host rock. Agate, a type of chalcedony composed of quartz layers, is striped by nature and appears in a variety of types and colors.
The name of each type of agate, such as Blue Lace Agate or Botswana Agate, is usually based on the color and/or the geographic location where the variety is mined. It is sometimes confused with jasper, another member of the chalcedony family, which has less distinct patterns than agate.
Agate, a cooling stone, is said to help improve memory and concentration and to encourage honesty. It is purported to promote strength and increase stamina while also curing insomnia.
Some wear agate as protection against danger.
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