Chalk
At a glance
- Type
- Rock
- Group
- Sedimentary rock
- Crystal system
- None (a rock)
- Hardness
- Soft (Mohs under 3)
- Density
- Light (under 2.5 g/cm³)
- Occurs in
- Sedimentary rocks
- Foliation
- Bedded (sediment layers)
- Colour
- White
- Lustre
- Dull
- Use
- Industry
- Difficulty in WildGuessr
- Easy
Did you know?
- Chalk is made largely of the tiny plates of microscopic sea algae called coccolithophores.
- The White Cliffs of Dover are chalk laid down in the Cretaceous, over 66 million years ago.
Could you guess it from clues?
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Similar stones
Classification, names and conservation status come from Wikidata (CC0), the photo from Wikimedia Commons. Wikidata Q183670 · All stones · All entries