Thomsonite was first identified in material from Scotland in 1820. It is named for the Scottish chemist Thomas Thomson. The crystal system of thomsonite is orthorhombic.
Thomsonite is one of the rarer zeolite minerals. It forms tight acicular radiating clusters and sphericules as well as some blockier crystals that are found in the vesicles or bubbles of volcanic rock. The color ranges from pink, reddish, purplish, yellowish, green, brown, tan, off-white, and nearly black, typically comprising concentric rings, sometime referred to as eyelike masses.
The piece compromised reddish crystal balls ranging from 1.25 inches to 0.2 inches. Most of them seems to be in one layer with one smaller crystal raised above others. One of the crystal is cut and showing the radiating center of the crystal. It is about 4 X 3.75 inches and weights 11.7 oz.