HED meteorites. Polarised light micrograph of thin sections of two HED (howardite, eucrite and diogenite) meteorites recovered from Antarctica, showin
HED meteorites. Polarised light micrograph of thin sections of two HED (howardite, eucrite and diogenite) meteorites recovered from Antarctica, showing the crystalline structure. HED meteorites are a large group of meteorites believed to originate from the Vesta asteroid. QUE 97053 (left) and EET 90020 (right) are eucrites, crystallised lavas with the composition of basalt, the most common lava type on Earth. QUE97053 consists mostly of elongated gray crystals of feldspar (calcium aluminium silicate) and brightly coloured grains of pyroxene (magnesium iron silicate), the texture of which is consistent with crystallisation of molten magma. EET90020 has similar mineralogy but a recrystallised texture of equant grains formed by later heating. Eucrites like
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Photo credit: © NASA/SCIENCE PHOTO LIBRARY / Alamy / Afripics
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