Augen gneiss
Rock
About it
Gneiss with large, eye-shaped feldspar crystals (augen is German for eyes) wrapped by darker foliation; usually deformed granite. Common in Norway, Scotland, and the Grenville Province of Ontario and Quebec.
- Type
- Rock (metamorphic)
- Group
- Metamorphic (foliated)
- Colours
- grey, white, pink, black
- Transparency
- opaque
- Cleavage and fracture
- breaks roughly along the foliation
Typical values: real specimens vary. For more, see mindat.org.