S-type asteroid
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Encyclopedic overview
433 Eros, an example of an S-type asteroid
S-type (stony-type or siliceous-type) asteroids are asteroids with a spectral type that is indicative of a siliceous (i.e. stony) mineralogical composition, hence the name. They have relatively high density. Approximately 17% of asteroids are of this type, making it the second-most common after the carbonaceous C-type.
Excerpted from Wikipedia’s “S-type asteroid” article, available under the CC BY-SA 4.0 licence.