Cinnabar and Idrialite from the Culver-Baer Mine, California, USA

Contributed by: Simone Conti
minID: QJP-P2C
Date: Dec 4th, 2024
Locality: Culver-Baer Mine, North Fork Little Sulphur Creek, Cloverdale, West Mayacmas Mining District, Sonoma County, California, USA (See on Mindat)
Size: 9 x 7 x 8 cm
Weight: 565 g

Description:
A very rich piece of yellow idrialite and red cinnabar. Some nice little crystals are visible with a druzy quartz (?) coating. The idrialite fluoresces very bright green under any UV light. The fluorescence photo was taken with a little bit of daylight too. Not sure yet if it is a better daylight or fluorescence specimen!

Normal light.

Fluorescence under longwave UV light (with a bit of white light).

Summary of luminescence responses:

Idrialite (Mindat) (RRUFF)

• Fluorescence under Longwave (365nm LED) UV light: Green
• Fluorescence under Midwave (305nm LED) UV light: Green
• Fluorescence under Shortwave (254nm Lamp/Mercury) UV light: Green