Browse Items (1651 total)

cordierite-bearing

coarse-grained

thin oxide crust

mostly hornblende

cordierite-bearing

high-grade metamorphism

cummingtonite-poor, brownish-green hornblende dominated

meatmorphosed peraluminous volcanic rock

orthoclase is concentrated in watery clear megacrysts with crushed borders

aluminous

Very coarse

Contains large augite crystals

Leucocratic, orthorhombic pryoxenes abundant

Leucocratic

Especially dark (not typical)

Many have large dark mineral clusters

No associated sulfides

Fine-banded, most of the bands are several inches wide and alternate light-dark