Chalcedony and Unknown - Batallones Hill, Torrejón de Velasco, Madrid, Spain
Contributed by: Daniel C. Montero
Date: May 4th, 2026
Locality: Batallones Hill, Torrejón de Velasco, Community of Madrid, Spain (See on Mindat)
Size: 8 x 10 cm
Description:
This is a really amazing specimen, and it is not only because of its color contrast but also because of its intense glow after SW the matrix stays blue.
Most of the samples that I have collected in this deposit are flint, covered with chalcedony and some aragonite, however only this one and another have this long phosphorescence.
Originally posted by Daniel C Montero on Nature's Rainbows in 2022.
Summary of luminescence responses:
Chalcedony (Mindat) (RRUFF)
- Fluorescence under Shortwave (254nm Lamp/Mercury) UV light: Green