The St. Louis Mineral & Gem Society's annual Mineral, Gem & Fossil Show and Sale returns to the Affton Community Center from Friday, November 20 through Sunday, November 22, 2026. It is one of the biggest mineral shows in the St. Louis area and a fun, family friendly stop for rock, gem, and fossil fans of every age.
Dates and hours
The show runs Friday, November 20 from 3:00 to 7:00 p.m., Saturday, November 21 from 10:00 a.m. to 7:00 p.m., and Sunday, November 22 from 10:00 a.m. to 5:00 p.m. at the Affton Community Center, 9801 MacKenzie Rd, Affton, MO 63123.
What to expect
Expect dealers and displays of minerals, gemstones, fossils, and lapidary work, with specimens and finished pieces available to browse and buy. Admission for the 2025 edition was $4 general admission, with discounts for students and free entry for children 13 and under; the 2026 admission price had not been published at the time of writing, so confirm the current price with the society before you go.
Plan your visit
Confirm hours and admission with the St. Louis Mineral & Gem Society before you head out, since details can change. While you are in Affton, the neighborhood guide covers the area's schools, parks, and dining, and Tracey is happy to help with any real estate questions.