Fluorescent Mineral Experiment: Calcined Barite - UVc

 

FOV: 5" wide

 

A rock consisting mainly of barite and fluorite was heated with a MAPP gas torch. Prior to heating, only the fluorite fluoresced. Heating the barite (BaSO4) caused it to thermally reduce to barium sulfide (BaS).

 

Contains:

BaS (FL+PHOS Orange >UVabc)

Fluorite (FL Blue >UVab)

 

Shown under UVc light.

 

Key:

WL = White light (halogen + LED)

FL = Fluoresces

PHOS = Phosphorescent

Blue = 450nm,

UVa = 368nm (LW), UVb = 311nm (MW), UVc = 254nm (SW)

'>' = "stimulated by:", '!' = "bright", '~' = "dim"

 

Rock donated by Polman Minerals

 

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18 Watt Triple Output UV lamp from Polman Minerals - Way Too Cool UV lamps

Done