Dielectric behaviors at microwave frequencies and Mössbauer effects of chalcedony, agate, and zultanite*
Paralı Leventa)†, Şabikoǧlu İsrafilb), Tucek Jiric), Pechousek Jiric), Novak Petrc), Navarik Jakubc)
       
(a) Room-temperature Mössbauer spectrum of the zultanite sample and (b) schematic representation of iron islands inside zultanite crystal structure (O and H atoms are omitted for the sake of clarity), where μi ( i = 1,2,3) is the magnetic moment of iron island, τi ( i = 1,2,3) is the relaxation time of a iron island magnetic moment, and τ m is the characteristic time of the Mössbauer technique (the arrows indicate reversal of iron island magnetic moment between favored orientations).