Signedon envelope: EDMUND SCIENTIFIC CO. / BARRINGTON, N.J. 08007
Inscribedon envelope: STOCK NO 40471 / MINERAL SPECIMEN / LODESTONE; on envelope, top left: 696502-1
FunctionChemically and mineralogically, these lodestones are magnetite, a massive type of iron ore, an oxide of iron, a mineral. Magnetite is quite common in nature, while lodestones are relatively rare.
These samples are probably meant for demonstrations.