Pabstite from the Kalkar Quarry, California

Contributed by: Simone Conti
minID: EP2-7V8
Date: Sep 17th, 2026
Locality: Pacific Cement and Aggregate Company quarry, Santa Cruz, Santa Cruz County, California, USA (See on Mindat)
Size: 7 x 4 x 10 cm
Weight: 383 g

Description:
Perhaps not the most impressive fluorescent rock, but quite interesting: tiny grains of pabstite on matrix, fluorescent bright blue under shortwave UV light. What makes this piece interesting is its size and richness in pabstite, which is usually found just as grains on thumbnail-size specimens.

Fluorescence under shortwave UV light.

Normal light.

Summary of luminescence responses:

Pabstite (Mindat) (RRUFF)

• Fluorescence under Shortwave (254nm Lamp/Mercury) UV light: Blue