Fluoborite - New Method Mine, Bristol Mountains, California

Contributed by: FMS Admin
Date: May 7th, 2026
Locality: New Method Mine, Amboy area, Bristol Mountains, San Bernardino County, California, USA (See on Mindat)
Size: 4 inches

Description:
We have not been able to dig up a lot of information on this material. We picked up this piece from a rock shop near the mine, so we assume the id is correct. Really interesting, fibrous material. Shown here in shortwave, longwave, and natural. We have added a very, very long exposure of the piece in MW just because it looks cool.

Originally posted by Fire Viper on Nature's Rainbows in 2018.

Fluorescence under longwave UV light.

Fluorescence under midwave UV light.

Fluorescence under shortwave UV light.

Normal light.

Summary of luminescence responses:

Fluoborite (Mindat) (RRUFF)

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