>100
$0.95
$0.95
>150
$0.90
$0.90
>200
$0.85
$0.85
Agate was formed in mountain lavas due to intergrowth of various minerals of the silica family (SiO2), in which chalcedony is the predominant mineral. It most often has a layered structure. Alternating layers come in different colors and may have varying degrees of transparency. Due to this, in the cross-section of the stone, an original, non-repeating pattern is found.