Metamorphic Rock Table

METAMORPHIC ROCKS

TEXTURE

ROCK NAME

DESCRIPTION

ORIGIN

foliated

gneiss

macroscopic mineral grains arranged in light and dark bands; feldspar and quartz chief minerals; mica and hornblene minor

granite

slate

dense, microscopic grains; breaks along parallel planes; quartz

shale

schist

parallel platy minerals; mica and hornblende and quartz; garnet may be accessory

slate

phyllite

parallel microscopic crystals; quartz and mica, has a sheen like glass or pearls

slate

non-foliated

quartzite

deformed, interlocked, fused crystals which break indiscriminantly; quartz

sandstone

marble

interlocked crystals, sugary appearance; calcite

limestone

anthracite (coal)

black, shiny, conchoidal (shell-like) fracture; carbon

bituminous coal