Essexite. Crawfordjohn, Scotland

This is a thin section of a rare volcanic rock, Essexite. From Crawfordjohn in southern Scotland. A silica poor rock containing large titaniferous (pink) augite crystals with excellent crystal form, showing growth zoning, zoned inclusions, sector zoning and magnificent interference colours. Numerous small but colourful olivine, somewhat fuzzy labradorite laths rimmed with alkali feldspar; apatite and magnetite. See page 97 Atlas of Igneous rocks and their textures. Very Special.


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