Magnetite Value Guide

Magnetite is a historically significant iron ore and the most magnetic naturally occurring mineral on Earth, famously used as the original 'lodestone' for early maritime compasses. Collectors prize these specimens for their dark metallic luster, sparkling inclusions, and the unique physical property of permanent magnetism.

What affects the value of Magnetite?

• The strength of the natural magnetic field, particularly in 'lodestone' varieties that exhibit polar magnetism.
• The presence and brilliance of sparkling mineral inclusions within the dark metallic matrix.
• The overall size and weight of the specimen, given its primary composition of iron ore.
• The aesthetic quality of the crystal structure, with octahedral forms typically commanding higher interest.

How to Identify Magnetite?

• Test for strong natural magnetism by checking if the specimen attracts small iron objects like paperclips or staples.
• Observe the physical appearance for a dark gray to black metallic finish with small, sparkling mineral inclusions.
• Verify the streak test by rubbing the mineral on a porcelain plate; authentic magnetite will leave a distinct black streak.
• Check for a high specific gravity, as the iron content makes these specimens feel significantly heavier than common rocks of the same size.

History of Magnetite

Magnetite is a significant iron ore, known since ancient times for its magnetic properties. It was the original 'lodestone' used in early compasses, guiding ancient mariners and explorers. Its unique magnetism, being the most magnetic of all naturally occurring minerals on Earth, has made it a subject of fascination and utility throughout human history, from early scientific experiments to modern industrial applications.