"The “Largest Piece of Mars on Earth” just sold at auction for about $5.3 million— $5,296,000, to be exact. Popular Science has reached out to Sotheby’s for confirmation of the sale price."
https://www.popsci.com/science/largest-chunk-of-mars-on-earth-sells-for-5-3-million/?user_id=66c4c92f5d78644b3ac5d5b4