Lodestone is a natural magnet that will attract objects such as staples, iron filings and needles. When suspended by a thread, it will align along a north-south axis, which is the principle of the compass. This specimens of Fe3O4 are from the Adirondack Mountains, of New York, (USA). These are a naturally occurring item. Size and shape is dependent on availability and will vary. May come as one larger piece or several smaller pieces. Approx. 300g, (0.7 lb).