Mount Sidley, Executive Committee Range, Marie Byrd Land, Western Antarctica, Antarctica

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Lower crustal pyroxenite xenoliths in a phonolite.
The xenoliths have suffered localized breakdown reactions during their residence in a shallow magmatic chamber below the volcano.

Ref:
*R.H. Grapes Et Al., Min. Mag. 08/2003, Vol.67 No.4:639-651.
*Geologic Map of Antarctica, 1:5,000,000 scale

Mineral List:

'Albite-Anorthite Series'
'Clinopyroxene Subgroup'
Forsterite

'Glass'
Kaersutite
Magnetite
var: Titaniferous Magnetite

Rhönite

7 entries listed. 3 valid minerals.

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