Lewisian gneiss metamorphic rock samples exhibiting asymmetrical plunging folds, ideal for educational use, the specimens come from Scotland, UK and are, some 3.0–1.7 billion years old, dating back to the Precambrian period. The rock is made of feldspar, quartz and biotite mica minerals which show banding and have folded in an asymmetrical fashion and plunged. Limited quantity available.

• Specimen 1: 70 x 50 x 45 mm
• Specimen 2: 100 x 75 x 50 mm