schist - greenschist - a facies of the Pelona Schist - display specimen Challenge them a bit to

Challenge them a bit to identify these by density and streak

click to enlarge

though individual specimens show many cleavage faces in several directions

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Amethyst quartz    SiO2

schist - greenschist - a facies of the Pelona Schist - display specimen Challenge them a bit toThis attractive dark green schist is mapped as a greenstone schist, has an uneven foliated parting, is composed of chlorite, epidote and albite feldspar. Schists vary greatly in composition and appearance. They are often derived from clays and muds and shales and fit into a metamorphic sequence of slate, phyllite, schist and gneiss in order of increasing metamorphosis. They can also be derived from fine grained igneous rocks. This schist, a unit of