Answer:
Iron on a mammal. Mammal on your feet.
I can be written, I can be spoken, I can be exposed, I can be broken.
A precious stone, as clear as diamond. Seek it out while the sun's near the horizon. Though you can walk on water with its power, try to keep it, and it'll vanish in an hour.
During the 1800's these turned women into hourglasses and is becoming more popular again these days
You can tumble in it, roll in it, burn it, animal eat it. Used to cover floors, still used beyond stall doors. Freshens whatever it is placed on. Absorbs whatever is poured into it.
Iām grown from darkness but shine with a pale light. Very round I am and always a lady's delight.