National Park Service
North Cascades Petrographic Images
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Petrographic Images
Petrographic Rock Type:
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amphibolite
argillite
biotite schist
blueschist
chert
gneiss
hornsfel
leucogranite
metagabbro
metavolcanic
migmatite
porphyry
quartz phyllite
schist
siltstone
slate
volcanic breccia