Chalcedony Cup from Hildago County, New Mexico
Contributed by: Michael Crawford
Date: Jun 29th, 2025
Locality: Yankee Dog Claim, Hidalgo County, New Mexico, USA (See on Mindat)
Size: 8 x 8 x 9 cm
Description:
This is a pink chalcedony cup from the Yankee Dog Claim, Hildago County, New Mexico. The pictures show the outside and inside of the cup. The cup has an oval opening to a hollow interior. The interior has a cave-like appearance with numerous small stalactites. The cup’s green fluorescence is caused by uranyl activation. The shortwave emission spectrum has peaks at 502 nm, 521 nm and 540 nm.
The specimen has very low radioactivity (less than 30 cpm).
Summary of luminescence responses:
Chalcedony (Mindat) (RRUFF)
- Fluorescence under Shortwave (255nm LED) UV light: Green
- Fluorescence under Midwave (305nm LED) UV light: Green