The Carnegie Gem and Mineral Show is running through this weekend, turning the first floors of both museums into a bazaar of semiprecious stones, mineral samples, and large crowds. Chaotic, but great fun. I discovered this beautiful sample showing dendrites from Solnhofen, Germany. Although they look organic, dendrites are mineral deposits and not the trace of some plant matter. I loved the way the background of the stone was the color of an old page, complete with cracking and faint rust marks or age spots. And the dendrites themselves were like etchings or very fine ink drawings. I won't be buying any Rembrandt prints soon, but at $4.00 this was my reminder of both shows.