Quartz Crystals on Calcite - San Antonio Mine, Chihuahua, Mexico
Contributed by: FMS Admin
Date: Feb 23rd, 2026
Locality: San Antonio Mine, East Camp, Santa Eulalia Mining District, Aquiles Serdán Municipality, Chihuahua, Mexico (See on Mindat)
Size: 10 inches
Weight: 5 lb
Description:
Small delicate crystal florets of yellow fluorescing quartz needles are peppered around a matrix of calcite on this striking specimen. Not often do we find quartz crystals fluorescing yellow like this. There is a bit of aragonite at the upper right corner.
Originally posted by John Rofrano on Nature's Rainbows.
Summary of luminescence responses:
Calcite (Mindat) (RRUFF)
- Fluorescence under Shortwave (254nm Lamp/Mercury) UV light: Red
- Fluorescence under Longwave (365nm LED) UV light: Yellow
- Fluorescence under Midwave (305nm Lamp/Mercury) UV light: Yellow
- Fluorescence under Shortwave (254nm Lamp/Mercury) UV light: Yellow