Chert
At a glance
- Type
- Rock
- Group
- Sedimentary rock
- Crystal system
- None (a rock)
- Hardness
- Hard (5.5 to 7.5)
- Density
- Medium (2.5 to 3.2)
- Occurs in
- Sedimentary rocks
- Foliation
- Not layered
- Colour
- Grey, Black, Red, Brown
- Lustre
- Dull
- Use
- No special use
- Difficulty in WildGuessr
- Hard
Did you know?
- Chert is made of microscopic quartz crystals, often from the silica skeletons of sponges and radiolarians.
- The Gunflint chert in Ontario preserves microscopic fossils about 1.9 billion years old.
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 Q1070438 · All stones · All entries