Siltstone
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
- Bedded (sediment layers)
- Colour
- Grey, Red, Yellow, Brown
- Lustre
- Dull
- Use
- No special use
- Difficulty in WildGuessr
- Hard
Did you know?
- Silt grains measure only about 0.004 to 0.06 millimetres, finer than sand but coarser than clay.
- Siltstone often shows paper-thin layers that record seasonal floods or the quiet bottoms of ancient lakes.
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.
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Classification, names and conservation status come from Wikidata (CC0), the photo from Wikimedia Commons. Wikidata Q565731 · All stones · All entries