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Magnesia\Magnesium (alchemy) Resembling a trident, this sign is a 16th century chemical symbol for magnesia. | |
Magnesia\Manganese An 18th century chemical symbol representing both magnesia and manganese. | |
Magnesia\Magnesium (alternate #1) A symbol used in early chemistry to represent magnesium. | |
Magnesia\Magnesium (alternate #2) A 17th century alchemical sign used to indicate magnesium. |