the.com/schist

a rock that flaked under pressure and came out shimmering with attitude

means A medium-grade metamorphic rock that splits easily into thin layers, its surface glittering with aligned mica and other platy minerals.

from From French 'schiste,' which came from Latin 'schistos' and ultimately Greek 'skhistos,' meaning 'split' or 'divided' — from the verb 'skhizein,' 'to split' (the same root that gives us 'schism' and 'schizo-'). The Greeks named it for exactly what it does: cleaves cleanly along its layers.

name origin
Greek for split, because it cleaves into sheets
mica makeup
its sparkle comes from aligned mica crystals
pressure born
forms deep underground from squeezed, baked mudstone
manhattan bedrock
holds up skyscrapers across New York City
foliated
its minerals line up in visible wavy bands
for instance

schist of the dachstein — austrian alps formation, famous for its mineral-rich outcrops producing garnets and mica near hallstatt

schist of the himalayas — indian-tibetan belt containing metamorphic schist with garnets and tourmalines, exposed in kashmir and himachal pradesh

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