Grossular - Sierra de Cruces, Coahuila, Mexico

Contributed by: FMS Admin
minID: N60-J5G
Date: Feb 21st, 2026
Locality: Sierra de Cruces, Sierra Mojada Municipality, Coahuila, Mexico (See on Mindat)
Size: 7.5 x 4 x 8.5 cm

Description:
Pink grossular dodecahedrons and yellow non-fluorescent vesuvianite in a matrix of quartz and calcite, from the famous deposit in Sierra de Cruces. The garnets are dim fluorescent red in longwave and midwave, likely from Cr3+ impurities. Also included are macro closeups.

Originally posted by Dennis Michael on Nature\'s Rainbows.

Fluorescence under longwave UV light.

Normal light.

Fluorescence under longwave UV light. Closeup FOV 35mm

Normal light. Closeup FOV 35mm

Fluorescence under longwave UV light. Closeup FOV 20mm

Normal light. Closeup FOV 20mm

Summary of luminescence responses:

Grossular (Mindat) (RRUFF)

• Fluorescence under Longwave (365nm LED) UV light: Red