Calcite - Pendleton Quarry, Anderson, Indiana
Contributed by: Chris Clemens
minID: 9QE-A1W
Date: May 21st, 2026
Locality: Pendleton Quarry (Irving Materials Quarry), Anderson, Madison County, Indiana, USA (See on Mindat)
Size: 43 x 36 x 53 mm
Description:
This specimen consists of complex intergrown golden calcite crystals perched on a limestone matrix, from the Irving Materials Quarry in Anderson, Indiana. Under visible light this specimen possesses what is referred to as "the inner light", an apparent inner glow, due to internal reflection from within the crystal that contrasts against the surrounding golden color. As shown below, under midwave UV, the calcite shows a beautiful pink-purple fluorescence.
Mindat.org Photo of the Day - 5th May 2025
Originally posted by Chris Clemens on Nature's Rainbows in 2021.
Summary of luminescence responses:
Calcite (Mindat) (RRUFF)
- Fluorescence under Midwave (305nm Lamp/Mercury) UV light: Violet