The X-group of asteroids collects together several types with similar spectra, but probably quite different compositions. == Tholen classification == In the Tholen classification, the X-group consists of the following types: E-type – with high albedo (> 0.30), composed of enstatite, forsterite and feldspar.
The X-group of asteroids collects together several types with similar spectra, but probably quite different compositions. == Tholen classification == In the Tholen classification, the X-group consists of the following types: E-type – with high albedo (> 0.30), composed of enstatite, forsterite and feldspar.
Source: Wikipedia "X-type asteroid" · CC BY-SA 4.0
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