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Rocks & Minerals (Hard)

WORD LIST
AGATE
CALCIUM
CHLORIDE
CHROMIUM
COAL
COBALT
COPPER
FELDSPAR
FLOURIDE
GRANITE
GYPSUM
HEMATITE
IODINE
IRON
MAGNESIUM
MAGNETITE
MARBLE
OBSIDIAN
PHOSPHORUS
POTASSIUM
PUMICE
PYRITE
QUARTZ
SELENIUM
SHALE
SLATE
SODIUM
SULFUR
TALC
ZINC