- Thumbnail, 2.7 x 2.3 x 1.4 cm
- Quincy Mine, Hancock, Houghton Co., Michigan, USA
2.7 x 2.3 x 1.4 cm (largest). A showy and excellent sawed and polished datolite nodule pair from the famous Quincy Mine of Michiganâ€™s Copper Country. The slices have high lustre, a nice porcelaneous texture and the thin gray rind is very attractive around the solid copper-included rust-red interior. Quality is off the charts.