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- hornblende phenocrysts, while phonolite contains sodalite and trachyte has barkevicite. Although the magma that formed São Tomé was originally sourced from...5 KB (616 words) - 09:09, 14 July 2024
- often found in the ground-mass. The commonest hornblende is dark brown barkevicite. Biotite and olivine are not really frequent in these rocks, and usually