Obsidian
At a glance
- Type
- Rock
- Group
- Igneous rock
- Crystal system
- None (a rock)
- Hardness
- Medium (3 to 5.5)
- Colour
- Black, Brown
- Lustre
- Glassy
- Use
- Jewellery
- Difficulty in WildGuessr
- Medium
Did you know?
- Obsidian is volcanic glass that breaks into edges sharper than a surgical steel scalpel.
- Stone Age people traded obsidian over long distances to make blades and arrowheads.
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 Q53754 · All stones · All entries