“Scalenohedral calcite on sulphur under white 2700K LED ”

“Fully luminescent scalenohedral calcite and sulphur lying on marlish limestone matrix Mining activity in La Serrata sulfur deposit began in the mid-nineteenth century and after some ups and downs the extraction ended definitively in 1959 Collected in the sixties UV source: WTC 9W Hg vapor duolamp 365 & 255 nm, filtered*** ”

“Scalenohedral calcite on sulphur White LED 2700K · · · (< >) · · · Phosphorescence · · · (< >) · · · Long wave UV* · · · (< >) · · · Short wave UV** WTC 9W duolamp 365/255 nm, filtered ”

“Under long wave UV ”

“Here with short wave UV ”

“Phosphorescence after being excited with UV lasts for several seconds with the naked eye ”

“Lateral view Matrix is a sulphur-impregnated Tortonian (Upper Miocene) marlish limestone ”