A variety of Chalcedony
A distinctly banded fibrous chalcedony. Originally reported from Dirillo river (Achates river), Acate, Ragusa Province, Sicily, Italy.
The banding in agate is based on periodic changes in the translucency of the agate substance. Layers appear darker when they are more translucent (this may appear reversed in transmitted light). This effect may be accompanied and amplified by changes in the color of neighboring layers, due to other co-precipitated minerals. In old agates that have been subject to weathering and chemical alteration the differences in translucency may disappear, such specimens may turn almost opaque. Agate is made of fibrous length-fast chalcedony, sometimes with layers of quartzine (length-slow chalcedony) fibers
Formula: SiO₂ silicon dioxide
Color: colorless, gray, red, white, any color due to embedded minerals, multicolored specimen not uncommon
Hardness: 6½ – 7
In our experience with agate has elevated self-confidence, help with concentration and releasing emotional trauma.