Rockyard Chalcedony Geode: - UVc

 

From the rockyard at the Highland Rocks and Gems shop in Burns, Oregon comes this 2.5" wide specimen.

 

Contains:

Chalcedony (FL Blue-green, Yellow-green >UVa,bc)

 

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"

 

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Photostream best viewed in Lightbox mode (in the dark).

 

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

Done