MineralBids is an online marketplace dedicated to mineral specimens, bringing together collectors, enthusiasts, and trusted sellers from around the world.

We focus on quality, transparency, and fair trading. Vendors apply to join the platform and are reviewed before being allowed to sell. Each listing represents a single physical specimen and, once sold, it is no longer available — no duplicates, no mass listings.

MineralBids supports both auctions and fixed-price sales, giving buyers and sellers flexible ways to trade. We handle the platform, visibility, and transaction flow, while vendors are responsible for accurate descriptions, proper packaging, and timely shipping.

MineralBids was founded by Christos Spiromitros, a geologist with over 20 years of experience as a mineral collector and dealer. Based in Thessaloniki, Greece, and also the owner of greekrocks.com, he built MineralBids on real-world knowledge of the mineral market, with a strong emphasis on specimen quality, transparency, and responsible trading.

Our goal is simple:
to create a clean, reliable, and community-driven marketplace for mineral collecting.