Pabstite from the Kalkar Quarry, California

Contributed by: Simone Conti
minID: VYW-539
Date: Sep 17th, 2026
Locality: Pacific Cement and Aggregate Company quarry, Santa Cruz, Santa Cruz County, California, USA (See on Mindat)
Size: 2.5 x 1.5 x 3 cm
Weight: 13.13 g

Description:
Tiny crystals of pabstite on matrix. Virtually invisible under normal light, they fluoresce bright blue under shortwave UV light, and a dimmer red under longwave UV. Under midwave UV they still fluoresce bright blue, and something else on the matrix fluoresces some dim red.

Fluorescence under midwave UV light.

Fluorescence under shortwave UV light.

Fluorescence under longwave UV light.

Normal light.

Summary of luminescence responses:

Pabstite (Mindat) (RRUFF)

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