Gneiss
At a glance
- Type
- Rock
- Group
- Metamorphic rock
- Crystal system
- None (a rock)
- Hardness
- Hard (5.5 to 7.5)
- Colour
- White, Grey, Black, Pink
- Lustre
- Glassy
- Use
- Building
- Difficulty in WildGuessr
- Medium
Did you know?
- The Acasta Gneiss in northern Canada is about 4 billion years old, among the oldest rocks known on Earth.
- The word gneiss is thought to come from an old German word for a spark, because of its glittering flakes.
Could you guess it from clues?
WildGuessr picks a secret animal, plant, fungus, stone, prehistoric creature or space object and you ask yes-or-no questions about it, such as its group or where it grows. The fewer clues you need, the more points you score.
Similar stones
Classification, names and conservation status come from Wikidata (CC0), the photo from Wikimedia Commons. Wikidata Q166409 · All stones · All entries