Agateisalsousedasakindofchalcedonymineral,oftenamixtureofopalandcryptocrystallinequartz.Thehardnessis6.5-7degrees,thespecificgravityis2.65,andthecolorisequivalent.Therearelevels.Itistranslucentoropaque.Theoriginalformoftrigonalcrystalsystem.Itisoftenintheformofadenseblocktoformvariousstructures,suchasbreast,grape,tuberculosis,etc.,whichareusuallyconcentricstructures.Chalcedonywithdifferentcolorcomposition,usually,green,red,yellow,brown,whiteandothercolors.Accordingtothepatternandimpuritiescanbedividedintoonyx,sardineagate,mossagate,castleagateandsoon.Oftenusedasplaythings,ornamentals,ornamentsorplaythings.Astringofagateballsisoftenseeninancientfuneraryobjects.