A mortar: granite or coals
granite
Fuel: coal or quartz
coal
Jewelry: slate or gemstone
gemstone
Chalks: mercury or limestone
limestone
Pencil lead: graphite or iron
graphite
The Taj Mahal: halite or marble
marble
Toothpaste: fluorite or slate
fluorite
Sparking eyeshadows: mica or marble
mica
A medical cast: talc or gypsum
gypsum