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S-type asteroid

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asteroid spectral type; siliceous (stony) composition and high density

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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.

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