description Thomsonite Overview
Thomsonite is a zeolite-group mineral series; the Lake Superior material sold and collected under this name is generally identified as thomsonite-Ca. Thomsonite-Ca is a hydrated calcium-sodium aluminosilicate that occurs in nodules and amygdales in volcanic rocks. Polished nodules from Minnesota's North Shore can show white, pink, greenish, or brown radial and concentric bands, including eye-like patterns, which distinguish this material for mineral collectors.
help Thomsonite FAQ
What is Lake Superior thomsonite?
Lake Superior thomsonite is generally identified as thomsonite-Ca, a hydrated calcium-sodium aluminosilicate in the zeolite group. It commonly occurs in rounded nodules and volcanic-rock amygdales.
Why does polished thomsonite show colorful patterns?
Thomsonite nodules can contain concentric or radiating mineral textures that appear as pink, green, white, red, or brown patterns when polished. The patterns reflect growth inside cavities in volcanic rock.
Is thomsonite a single mineral species?
The name thomsonite has historically been used for a zeolite mineral series. Modern descriptions distinguish thomsonite-Ca, which is the form commonly associated with Lake Superior material.
Where is thomsonite found?
The best-known collector material comes from the Lake Superior region, especially volcanic rocks along the shores of Minnesota and Michigan. It forms in cavities and gas bubbles that later became mineral-filled.
explore Explore More
Reviews & Comments
Write a Review
Be the first to review
Share your thoughts with the community and help others make better decisions.
